Bowers & Wilkins CT800 User's Manual
Contents
1. 2x 250mm 10 in carbon fibre rigid foam sandwich cone bass 6dB at 26Hz and 40kHz monopole mode 6dB at 26Hz and 22kHz dipole mode 31Hz 22kHz 3dB on reference axis monopole mode 31Hz 18kHz 3dB power averaged over front hemisphere dipole mode Monopole mode within 2dB of reference response Horizontal over 40 arc Vertical over 10 arc Dipole mode horizontal figure of eight Effective null zone 30 250Hz 18kHz 93dB spl 2 83V 1m 2nd and 3rd harmonics 90cB 1m lt 1 45Hz 20kHz 80 minimum 4Q 300Hz and 4kHz monopole mode 800Hz dipole mode 50W 1000W into 8Q on unclipped programme 0 10 Height 1100mm 43 3 in without spike feet Width 325mm 12 8 in Depth 250mm 9 85 in 75kg 165 Ib Cabinet Black Model Description Functions Inputs Outputs Rated Power Consumption Dimensions Net Weight Finish CT8 XO CT800 system active bass management controller Bass midrange crossover Subwoofer bass crossover Low frequency roll off alignment High frequency roll off alignment Wall proximity response adjustment Subwoofer in out Level adjustment for number of subwoofers 12V trigger switching for surround mode 3 adjustable parametric equalisers Line In RCA Phono 12V trigger 3 5mm jack MF HF Line Out XLR amp RCA Phono LF Line Out XLR amp RCA Phono Subwoofer Line Out 2 x XLR amp RCA Phono 12V trigger 3 5mm jack 10W He2. will probably be lit If it is the left one turn the parametric filter overall gain C3 anti clockwise until both lights are out Conversely if the right light is lit turn the control clockwise until both lights are out Disconnect the signal generator and reconnect the sound card and outputs to the power amplifiers Taking further measurements to check the results adjust the low and high frequency controls to suit Additional response shelving up to 40Hz may be achieved by altering the subwoofer gain C14 and from 40Hz to 500HZ by altering the LF gain C13 If you need to equalise another speaker you must reload the CT800 setup within WinMLS and repeat the above process 25 Running In and Ancillary Equipment Ancillary equipment Speakers of this ability deserve signals of the highest quality Choose your electronic equipment and interconnecting cables with care We can give guidance on what to look for when choosing ancillary equipment but cannot recommend specific items The standards of such products are improving all the time and your dealer will be able to demonstrate a variety of suitable up to date products In the specification we recommend a range of amplifier powers The higher figure is defined by the power handling capability of the speaker When calculating the power handling it is assumed that the amplifier is not run into clipping which distorts the frequency power spectrum of the signal and that the signal is no
3. EF ON Left surround channel ON Right surround channel ON Centre channel ON These settings apply when all power amplifiers have t he same gain the parametric equalisers are bypassed trigger switching is used to set the dipole monopole mode of the CT8 DS speakers and one subwoofer is connected to each of the front left and ri ght channels Equipment Required e AC voltmeter e Signal Generator capable of outputting a sine wave up to 2V RMS e Flat bladed screwdriver to adjust the rotary controls of the CT8 XO And to adjust the equalisers to optimise the in room response e Laptop PC with WinMLS 2004 or later version software installed e External sound card e Measuring microphone WinMLS may be purchased directly from the software supplier in which case it should be WinMLS 2004 or later and be to level 3 license It should also include the specially created B amp W CT800 measurement module Early versions of the software did not include this module but the latest version may
4. correct mechanical properties The drive unit suspensions will also loosen up during the first hours of use The time taken for the speakers to achieve their intended performance will vary depending on previous storage conditions and how they are used As a guide allow up to a week for the temperature effects to stabilise and 15 hours of average use for the mechanical parts to attain their intended design characteristics However longer run in periods as long as a month have been reported and there is evidence to suggest that this has little to do with the speaker changing and more to do with the listener getting used to a new sound It is especially so with highly revealing speakers such as these where there may be a significant increase in the amount of detail portrayed compared to what the listener has previously been used to the sound may at first appear too up front and perhaps a little hard After an extended period of time the sound will seem to mellow but without losing clarity and detail Aftercare The speaker cabinet surfaces and the casing of the CT8 XO usually only require dusting If you wish to use an aerosol cleaner remove any speaker grilles first by gripping round the edges and gently pulling them away from the cabinet Spray onto the cleaning cloth not directly onto the cabinet The grille fabric may be cleaned with a normal clothes brush whilst the grille is detached from the cabinet When replacing grilles ensure t
5. may be added to each main channel It should be noted here that the addition of more subwoofers to any single channel requires an adjustment of the subwoofer output level of that channel s CT8 XO in order to restore the correct tonal balance The LFE channel is then distributed to all the main channels that have a subwoofer assigned by the simple action of configuring the surround processor as if there were no subwoofer present and specifying where the LFE signal should be routed Strictly speaking the phrase no subwoofer here means no subwoofer dedicated to the LFE channel Planning the installation Figure 1 E TS x 5 o o Bal 3 salza j 2 s vel RTR amp PY es 5 55 305 to EG sei ge F 322 g Zo CT8 LR CT8 CC J e CT8 DS amp amp e CT8 SW e e CT8 XO Figure 2 Figure 3 120 Figure 4 40 Safety Warning A CT800 system is capable of producing very high sound pressure levels Prolonged exposure to high sound levels can lead first to temporary and later permanent hearing damage Do not exceed recommended Leq equivalent sound level exposure levels for example those specified in ISO 1999 1990 Check the contents against Figure 1 Planning the installation Because of the built in nature of the installation the
6. signal peaks between the 6dB and 3dB 60 60 marks 78 78 i fe Uncal Uncal aS Uncal Fe Close the Volume and Input Levels window and click the 19 6 foo 144 0 firs Faas button to switch off the test signal Make sure Plot Overlay is checked to show the frequency response screen and enable several responses to be viewed simultaneously Press the F7 key to bring up the Measurement Settings window In the Levels box set the sine sweep to 40dB FS full scale Perform a number of measurements in different positions by clicking the D button or pressing the F2 key Make the last measurement you take close to the centre of the listening area and leave the microphone exactly in that position for subsequent measurements Since Plot Overlay is checked the curves will be plotted on top of each other and when finished there will be n curves displayed In the example shown in figure 22 n 10 Click the 8TT button to display the mean value on top of all the plotted curves The average room response is then calculated figure 23 This is the response we want to equalise Un tick all the plots except the mean response figure 24 Press CTRL E to save this mean result in the Tune EQ folder if this folder doesn t exist create it in C Program Files WinMLS2004 Set EQ Then click Save and name the file for example Average_resp txt figure 25 23 Figure 26 Frequency Response Spectrum
7. the front of the unit pull off the decorative facing plate Refer to figure 20 for the layout of the inputs and controls which have the following functions C10 C11 C12 C13 C14 S1 s2 s3 Test input socket unbalanced Test input socket balanced Output level indicator lights Low frequency contour control High frequency contour control Parametric filters overall gain Parametric filter 1 gain Parametric filter 1 Q Parametric filter 1 frequency Parametric filter 2 gain Parametric filter 2 Q Parametric filter 2 frequency Parametric filter 3 gain Parametric filter 3 Q Parametric filter 3 frequency LF output gain Subwoofer output gain DIP switch bank 1 DIP switch bank 2 DIP switch bank 3 DIP switch bank 4 To connect external signal generator To connect external signal generator To balance levels 6dB see figure 19 top graph 4dB see figure 19 bottom graph 4 12dB 0 5 5 30Hz 500Hz 4 12dB 0 5 5 30Hz 500Hz 4 12dB 0 5 5 30Hz 500Hz See table See table See table See table 17 The DIP switches should be set as follows where ON is down BANK 4 Switch 1 Condition ON CT8 SW subwoofer s not connected OFF CT8 SW subwoofer s connected Switch 2 Condition ON if subwoofer power amplifier has same gain as MF HF power amplifier OFF if subwoofer power amplifier has different gain from MF HF p
8. 3 as required by figure 21 according to the position of the CT8 DS in the system Set Bank 3 Switch 2 as desired according to preference and Bank 3 Switch 3 as required by figure 21 The Theory A number of response measurements R to R are taken and the average or mean response R is calculated The microphone is left at position n and further measurements are taken as adjustments are made to the equalisation If the measured equalised response at position n called Rye is multiplied by Rm and divided by the unequalised Rp one can review the equalised mean response Rineq Rneg Rm Rmeq Rn Configure the equalisers Sensible correction of the in room response requires the ability to measure the acoustic frequency response of each speaker individually The measurement microphone does not need to be expensive and suitable electret microphones are widely available If the appropriate measuring equipment is not available we recommend that the parametric filters be bypassed by setting Bank 2 Switches 2 amp 3 to OFF Setting of the low and high frequency contour controls may be attempted by ear to the user s preference Correcting for room resonances requires thought skill and patience It is not sensible to attempt to fully equalise response dips as this may lead to system overload Fortunately dips are less objectionable than peaks For this reason each parametric filter allows just 4 5dB of boost but 12dB of cut It is al
9. B amp W Bowers amp Wilkins CT800 Series Installation Manual Warranty Owner s Manual Important Safety Instructions Introduction Environmental Information The Concept Planning the Installation Checking the Contents Speaker Position Surround Speaker Dispersion Mode Mounting the Speakers Installing CT8 DS Into a Drywall Installing CT8 DS to a Wall Surface Connecting the System The Speakers The CT8 XO Crossover Equaliser Description of Controls Configure the CT800 XO to the Speaker Configure the Unit to the Gain of Each Amplifier Configure the Dipole Lobe for a CT8 DS Configure the Equalisers Running In and Ancillary Equipment Aftercare Specifications Table of Contents fee 26 27 28 Warranty Dear customer Welcome to B amp W This product has been designed and manufactured to the highest quality standards However if something does go wrong with this product B amp W Loudspeakers and its national distributors warrant free of charge labour exclusion may apply and replacement parts in any country served by an official B amp W distributor Limited Warranty This limited warranty is valid for a period of five years from the date of purchase or two years for electronics including amplified loudspeakers Terms and Conditions 1 The warranty is limited to the repair of the equipment Neither transportation nor any other costs nor any risk for removal transportation and insta
10. PUT LF power amplifier 7 s To MF HF of right CT8 DS gt To LF of right CT8 DS gt To MF HF of left CT8 DS gt To LF of left CT8 DS To trigger of left CT8 DS To trigger of right CT8 DS P z eo TORO ATA OUTPUT To MF HF of CT8 CC MF HF power amplifier INPUT FN XLF of cT8 cc LF power amplifier INPUT 16 The CT8 XO crossover equaliser The CT8 XO may be placed on a table or shelf or in a 19 in rack If housed in an enclosed structure proper ventilation must be supplied as stated in the in the safety instructions The CT8 XO is connected between the surround processor and the power amplifiers A choice of unbalanced cinch RCA Phono or balanced XLR connectors is provided The wiring convention for XLR connectors is Pin 1 Ground Pin 2 Live Pin 3 Return For each CT8 XO setup use only all balanced or all unbalanced connections Mixing the type of connectors could lead to a severe tonal imbalance in the system depending on the other equipment used in the installation If 12V trigger switching of the dispersion mode monopole dipole of the CT8 DS surround speakers is required the assigned 12V trigger output from the surround processor is connected to the 12V TRIGGER IN of one of the CT8 XO units assigned to a CT8 DS The other CT8 XO trigger inputs are connected daisy chain fashion from the TRIGGER LOOP socket of one to the TRIGGER IN of the next The TRIGGER OUT sockets are connected
11. Settings Axes settings He Logarithmic X Horizontal axis Vertical gaa Compensation of Level frequency dependent F Microphone divide B amp K 4939 grid 2327 v m Calculation settings Type Magnitude General frequency domain settings T Harmonic dist Seperate gt Settings Settings M Smoothing No shift or normalization X m Display in plot Settings h E I Guidelines F Values as Marks decimals Fix at Freq Hz 1000 Multiply Linear 10 with shift dB f Shift dB 188 e ee Figure 27 General Frequency Domain Settings m Active measurement settings Time window settings for Active Measurement IV Use Time Data processing before computing frequency response Time Data plottype settings m Fourier transform size Zeropad to lowest possible order of two 65536 v Frequency separation 0 37 Hz C Exact same as Time Window C Zeropad to samples Reference measurement Divide complex active measurement with reference measurement IF Use unique time window for reference measurement Settings Cre f awmb m Memory eio b I Update after new measurement a martial C T Divide with frequency domain ref measurement Figure 28 xl Erase fa z curves IV Clear memory all measurements that are not plotted Cancel Help 24 I Average time
12. ages is never quite as precise as it is between the front speakers Most films are originally balanced for cinemas where a large number of speakers spread around the auditorium are used to create the surround sound field In that case there are more surround speakers than there are discrete channels of information and a less precise image is created that gives an all enveloping effect Dipoles and similar diffuse speakers are better at recreating this type of sound field in the home but using fewer speakers to do it Image positioning with these types of speaker is never as precise as it can be with monopoles However they do have the advantage of making it easier to balance the system for a larger listening area You may well receive conflicting advice from different sources on the best type of surround speaker to use The truth is that there is no one perfect solution for all situations and the final choice for any given application will be influenced by personal preference The CT8 DS is a specialist surround speaker and has the advantage of offering a choice of both monopole and dipole operation The mode of operation is set by a relay inside the speaker the state of which is controlled from the CT8 XO crossover equaliser assigned to the speaker via a cable connecting the 3 5mm sockets on both products If this cable is not fitted the speaker will only operate in monopole mode On the CT8 XO is a switch used to select the mode In the monopole pos
13. any kind on the product Do not place any object containing liquid on top of the product Introduction Thank you for purchasing a Bowers and Wilkins Custom Theatre system Since its foundation in 1966 the continuing philosophy of B amp W has been the quest for perfect sound reproduction Inspired by the company s founder the late John Bowers this quest has entailed not only high investment in audio technology and innovation but also an abiding appreciation of music and movies to ensure that the technology is put to maximum effect Custom Theatre speakers are specifically designed to be built into the fabric of the listening room or into custom furniture as part of a fully designed theatre concept To that end they incorporate several features that enable them to be adapted to a wide range of installation conditions and deliver superb sound quality However they specifically do not incorporate features found on some other B amp W products that are not appropriate to this type of installation An example of such a feature would be tweeter on top which only operates well with a free standing speaker Furthermore because of the normal custom install practice of hiding built in speakers with acoustically transparent cloth that matches the d cor all the models except one are supplied without grilles The exception is the CT8 DS surround speaker which needs to protrude into the room in order for the side firing drivers to operate properly No
14. be downloaded from www winmls com However a special package that includes a suitable microphone USB sound card and a cut down version of the software that includes everything required for tuning a CT800 system may be obtained directly from B amp W Contact your country distributor for details Ths illustrations on the following pages refer to the B amp W version of the software The standard version will differ slightly Configure the CT800 XO to the speaker Set Bank 1 Switches 2 amp 3 to the type of speaker Set Bank 4 Switches 1 3 amp 4 according to the number of subwoofers attached The conditions of Switches 3 amp 4 are irrelevant if Switch 1 is set to ON Configure the unit to the gain of each power amplifier The reference gain is that of the power amplifier feeding the MF HF drive units If using the same type or even the same gain of power amplifier throughout simply set Bank 2 Switch 1 and Bank 4 Switch 2 both to ON If the power amplifier gains are different you will need a sine wave oscillator and AC voltage meter to set the correct compensation gain in the unit During this process the parametric equalisers should be bypassed by setting DIP switches 2 and 3 in bank 2 to OFF and the contour controls C1 amp C2 set to zero Setting the LF gain Disconnect the speakers from the power amplifiers Connect the MF HF power amplifier to the LF output of the unit Set the output level of the oscillator to zero and con
15. cal over 10 arc 93aB spl 2 83V 1m mf hf 2nd and 3rd harmonics 90cB 1m lt 1 45Hz 20kHz lt 0 5 55Hz 20kHz 8Q minimum 4Q 300Hz 4KHz 500W 1000W into 8Q on unclipped programme 0 10 Height 325mm 12 8 in without spike feet Width 1100mm 43 3 in Depth 550mm 21 65 in 85kg 187 Ib Cabinet Black Closed box subwoofer 1x 380mm 15 in carbon fibre rigid foam sandwich cone bass 6dB at 13Hz and 40Hz using active crossover equaliser 18Hz 35Hz 3dB on reference axis using active crossover equaliser Within 2dB of reference response Horizontal over 60 arc Vertical over 10 arc 90dB spl 2 83V 1m 2nd and 3rd harmonics 90dB 1m lt 1 30Hz 500Hz lt 0 5 45Hz 300Hz 8Q minimum 4Q 40Hz 500W 1000W into 8Q on unclipped programme 0 1Q Height 475mm 18 7 in without spike feet Width 475mm 18 7 in Depth 475mm 18 7 in 35kg 77 Ib Cabinet Black Specifications Model Description Drive Units Frequency Range Frequency Response Dispersion Sensitivity Harmonic Distortion Nominal Impedance Crossover Frequency Recommended Amplifier Power Max Recmmended Cable Impedance Dimensions Weight Finish 3 way monopole 2 way dipole selectable closed box surround system 1x o32mm 11 4 in alloy dome high frequency 6x 100mm 4 in midrange high frequency 1x 150mm 6 in woven Kevlar cone FST midrange
16. constant Set active as ref OK Cancel Help r Various T Invert resulting response complex I Add frequency resolution line Plottransfer function in Scope mode Scope mode Trensient signal energy gt To set this curve as a multiplier press the F5 key In this dialog box select the file you just saved Average resp and under Compensation of Level check the Tune EQ multiply box as shown figure 26 This curve is now the reference and all subsequent measurements will be multiplied by this response Click OK The graphs will change but ignore these changes We now need to set division by the measurement performed in this last position with no equalisation R Press Ctrl F and make sure this last measurement is selected as shown in figure 27 in this example 10 was the last measurement position and that is therefore set as reference Click OK The graphs will change but ignore these changes When we now perform another measurement with the equalisation applied Ryeq the software will calculate the quantity Rmeq Rneq Rm in our case the original measurement at position 10 is R Rn Now it is time to clean up the display Make sure the following button is turned off STAT To remove the measurements we used to make the reference click the erase button 2 and select the settings shown in figure 28 this will remove all the curves in the plot and remove the measurements from memor
17. ee models to extend their bass response well CT8 XO An active line level crossover equaliser that a is required for each CT8 LR CT8 CC and CT8 DS and must be configured to the particular speaker type b provides active filtering between midrange and bass drivers and between bass drivers and CT8 SW if used c controls whether a surround speaker operates in dipole or monopole mode and in dipole mode controls the direction of the positive and negative polarity lobes d provides high and low frequency level control plus three adjustable parametric equalisers to adjust for speaker room interface effects The crossover between midrange and tweeter drive units is accomplished by a passive filter inside each speaker Although the speakers are semi active and require an active crossover all power amplification must be separately sourced Each CT8 LR CT8 CC and CT8 DS requires two channels of power amplification or three if used with a CT8 SW subwoofer This allows the user maximum flexibility in choosing these components The CT8 SW subwoofer unlike the majority of subwoofers currently available does not contain its own power amplifier and is used in a different manner than is usual The original concept of home theatre based on various Dolby Digital and DTS systems advocates five or more main channels plus a single Low Frequency Effects LFE channel The main channels contain full range signals and the LFE chan
18. hat the pegs are correctly aligned with the receptacles in the cabinet before pushing into place Avoid touching the drive unit diaphragms especially the tweeter as damage may result 21 Specifications Model Description Drive Units Frequency Range Frequency Response Dispersion Sensitivity Harmonic Distortion Nominal Impedance Crossover Frequency Recommended Amplifier Power Max Recmmended Cable Impedance Dimensions Weight Finish 28 8 way closed box system 1x 382mm 11 4 in metal dome high frequency 1x 150mm 6 in woven Kevlar cone FST midrange 2x 250mm 10 in carbon fibre rigid foam sandwich cone bass 6cB at 23Hz and 40kHz 29Hz 24kHz 3dB on reference axis Within 2dB of reference response Horizontal over 60 arc Vertical over 10 arc 930B spl 2 83V 1m mf hf 2nd and 3rd harmonics 90dB 1m lt 1 45Hz 20kHz lt 0 5 55Hz 20KHz 8Q minimum 4Q 300Hz 4kHz 500W 1000W into 8Q on unclipped programme 0 10 Height 1100mm 43 3 in without spike feet Width 325mm 12 8 in Depth 550mm 21 65 in 85kg 187 Ib Cabinet Black 3 way closed box system 1x 932mm 114 in metal dome high frequency 1x 150mm 6 in woven Kevlar cone FST midrange 2x 250mm 10 in carbon fibre rigid foam sandwich cone bass 6dB at 23Hz and 40kHz 29Hz 24kHz 3dB on reference axis Within 2dB of reference response Horizontal over 60 arc Verti
19. he socket drive does not have a nut retaining feature we recommend the use of a small piece of Bostik Blu Tack or similar reusable adhesive to prevent the nut falling out of the drive during this operation Replace the facing plate on the front of the speaker and remove the tweeter protection cover If the speaker is mounted on the floor and recessed into a drywall having a horizontal stud member on the floor surface the height difference may be taken up by fitting the optional spike feet in place of the two front roller glides figure 14 Only one Spike Foot Kit will be required for each pair of CT8 DS Figure 15 CT8 XO HEOUT LFOUT FROM CT8 XO HF MF POWER AMP LF POWER AMP Figure 16a Figure 16b CT8 LR CC DS Figure 17 Connecting the System The speakers All the speakers are provided with a comprehensive choice of connection methods Binding posts accommodate 6mm 1 4 in or 8mm 5 16 in spades 4mm banana plugs and bare wire ends and a Neutrik Speakon socket provides a professional industry standard multiway connection that makes it easy to make a connection in confined spaces especially when it is sometimes difficult to see what you are doing For all models except the subwoofer CT8 SW there are two input channels one for bass and one for midrange tweeter requiring two channels of power amplification In all cases ensure that the positive term
20. he speaker is exposed figure 7 Note that if the optional feet are fitted or if the speaker is tilted appropriate allowance over and above that allowed for in the template must be made when cutting an aperture in the wall The threaded bosses that hold the feet have a large conical shape on one side of the flange For maximum height fit the bosses with the conical shape towards the floor figure 8 For minimum height have them pointing into the speaker figure 9 Screw in the feet close to where you think the final adjustment will be with the spikes or the rubber ends outermost as appropriate to the floor surface If you do not intend to tilt the speakers orient the bosses with the cones inwards and leave just enough thread exposed to fit the locking rings Fit but do not tighten the locking rings Stand the speaker upright and adjust the feet using the metal bar provided to give the amount of tilt required and to take up any rocking figure 10 Finally tighten the locking ring against the boss again using the metal bar figure 11 The tweeter drive units are fitted with a protective clear plastic cover on delivery This is to avoid the danger of damaging the dome when installing the speakers Once installed the protection cover should be removed by simply pulling it away from the speaker 11 Figure 12 12 CT8 DS Only Installation into drywall figure 12 So that it can be sunk in
21. ight 44 5mm 1 75 in 1U Width 483 mm 19 in Depth 356 mm 14 in 8kg 17 6 Ib Facing plate Anodised Aluminium Chassis Black 29 B amp W Bowers amp Wilkins B amp W Group Ltd Dale Road Worthing West Sussex BN11 2BH England T 44 0 1903 221 800 F 44 0 1903 221 801 info bwgroup com www bwspeakers com UK Group UK Sales T 44 1903 221 500 E uksales bwgroup com B amp W Group North America T 1 978 664 2870 E marketing bwgroupusa com B amp W Group Asia Ltd T 852 2 869 9916 E showroom bwgroup hk Copyright B amp W Group Ltd E amp OE Kevlar is a registered trademark of DuPont Rohacell is a registered trademark of R hm GmbH Printed in Canada 1109835 Issue 6
22. inal of the speaker is connected to the corresponding positive output connector of the power amplifier Failure to observe this will result in impaired tonal balance and imaging Figure 15 shows a typical connection method using binding posts and figure 16 a amp b the wiring convention for the Neutrik Speakon plug CT8 DS only In addition to the audio signal connections the CT8 DS terminal panel has a 3 5mm stereo jack socket figure 17 to input two 12V trigger signals from its CT8 XO unit Use a stereo coaxial cable terminated at each end by a 3 5mm stereo jack plug to connect to the complementary output socket TRIGGER OUT at the rear of the CT8 XO 15 The CT8 XO Rear Panel MFI OUT 7 Co TRIGGER n IN Loop OUT g 5 r FOUT 7 ara INPUT Qo Oe Figure 18 Processor CENTRE REAR FRONT 12V TRIGGER Front left Front right O ad VN MF HF power amplifier INPUT MF HF power amplifier LF power amplifier IR OA AJ Sub power amplifier gt To left CT8 SW OUTPUT LF power amplifier INPUT OUTPUT Sub power amplifier INPUT gt To MF HF of left CT8 LR gt To LF of left CTS LR To MF HF of right CT8 LR To LF of right CT8 LR JRR Oo OO of Rear right mok OUTP r MF HFpower AN Centre channel P OUT
23. ition this switch may be overridden by a 12V trigger signal from the surround processor Some surround processors can recognise the type of programme being played from a code on the disc and allow you to assign a 12V trigger to this code Some other processors allow you to assign a 12V trigger to the input selection and you may for example use a different disc player for audio and movies and set the trigger accordingly In both these cases you may choose whichever type of operation best suits the conditions of the listening room the size of audience and the type of programme being played Indeed you may even change the characteristic for different types of programme and as the total energy into the room is the same in both modes no recalibration of the installation is necessary when switching between them The two bass drivers operate in both modes In monopole mode they cross over to the midrange and tweeter drive units on the front face and the speaker is acoustically similar to the CT8 LR but without the swivelling head In dipole mode the bass drivers cross over to the six side firing drivers The drive units on opposing sides are connected out of phase with one another which creates a wedge shaped null zone approximately 60 wide at right angles to the wall If the listeners sit within this zone they become less aware of the location of the speakers and hear more reflected sound hence the diffuse nature of the sound field figure 5 Fig
24. le brackets A to the inside face of the vertical struts Attach the wall bracket C to the angle brackets A using machine screws D and trapping the stud plate B in position Patch the drywall as necessary Figure 13 CT8 DS only cont d Installation to wall surface figure 13 Using the front aspect template provided mark the centre line of the retaining bracket on the wall The two angle brackets A from the kit are not required Offer the wall bracket C to the wall and mark the screw positions at each end Drill and plug the wall to take screws in the range 5mm 6mm No 10 to No 12 Screw the wall bracket to the wall trapping the stud plate B in position 13 Figure 14 14 CT8 DS only cont d Continue for all cases Connect the signal and trigger cables to the speaker Using the Allen key provided remove the aluminium facing plate on the front of the speaker taking care that the tweeter protection cover remains in position Fit the guide tubes F into the two through holes Offer the speaker into position ensuring that the guide tubes F locate over the studs of the bracket B When the speaker is fully in position hard against the wall bracket withdraw the guide tubes Using a 1 4 inch socket drive with extension and the 18mm socket provided fit the two flanged nuts E onto the threaded studs and tighten If t
25. llation of products is covered by this warranty 2 _ This warranty is only valid for the original owner It is not transferable 3 This warranty will not be applicable in cases other than defects in materials and or workmanship at the time of purchase and will not be applicable a for damages caused by incorrect installation connection or packing b for damages caused by any use other than correct use described in the user manual negligence modifications or use of parts that are not made or authorised by B amp W c for damages caused by faulty or unsuitable ancillary equipment d for damages caused by accidents lightning water fire heat war public disturbances or any other cause beyond the reasonable control of B amp W and its appointed distributors e for products whose serial number has been altered deleted removed or made illegible f if repairs or modifications have been executed by an unauthorised person 4 This guarantee complements any national regional law obligations of dealers or national distributors and does not affect your statutory rights as a customer How to claim repairs under warranty Should service be required please follow the following procedure 1 If the equipment is being used in the country of purchase you should contact the B amp W authorised dealer from whom the equipment was purchased 2 Ifthe equipment is being used outside the country of purchase you should contact B amp W national dis
26. lt in to a false pillar but this must be acoustically transparent at the sides as well as the front as indicated by the shaded area If the speakers are to be inset in a false wall a front template is provided for guidance in cutting the aperture The template is the same size as the speaker so remember to leave some clearance The height of the template includes the roller glides If the speakers are to be mounted in custom furniture you should also ensure that it is substantially built and not prone to induced vibration It should be braced where necessary and it may be beneficial to glue bituminous damping pads similar to those used in motor vehicles to large unsupported panels Such pads need to be thicker on wood than metal and a minimum of 6mm 1 4 in should be used Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 If it is desired to remove the roller glides use the Torx key supplied with the speaker to remove the retaining screws An optional spike foot kit is also available Part No FP22359 The kit contains 4 heavy duty feet that have 40mm 1 6 in of vertical adjustment allowing tilt up to 8 if desired This tilt is in addition to that offered by the adjustable head unit of the CT8 LR and CT8 CC The feet are reversible having a spike for carpets on one end and a rubber pad for vulnerable surfaces on the other Fitting is most easily accomplished during unpacking when the underside of t
27. matter how good the speakers themselves may be they will not deliver their full potential unless properly installed Please read through this manual fully It will help you optimise the performance of the system B amp W distributes to over 60 countries worldwide and maintains a network of dedicated distributors who will be able to help should you have any problems your dealer cannot resolve Environmental Information B amp W products are designed to comply with international directives on the Restriction of Hazardous Substances RoHS in electrical and electronic equipment and the disposal of Waste Electrical and Electronic Equipment WEEE The crossed wheelie bin symbol indicates compliance and that the products must be appropriately recycled or processed in accordance with these directives The Concept The CT 800 range comprises five products CT8 LR A 3 way speaker intended for front left and right channels one placed in vertical orientation at each side of the screen CT8 DS A full range surround speaker that may operate in either 2 way dipole or 3 way monopole mode CT8 CC A 3 way centre channel speaker that is acoustically similar to the CT8 LR but designed with a more symmetrical drive unit layout so that it may be used in horizontal orientation immediately above or below the screen below the accepted lower limit of human hearing CT8 SW A subwoofer that may be added to any or all the above thr
28. nect it to the appropriate test input socket Set the oscillator frequency to 100HZz Set Bank 1 Switch 1 to ON Set Bank 2 Switch 1 to ON Set Bank 2 Switches 2 amp 3 to OFF Connect the AC voltmeter to the output terminals of the MF HF amplifier Raise the output level of the oscillator until the meter reads 2 volts Substitute the LF power amplifier for the MF HF power amplifier Do not alter the output setting of the oscillator Set Bank 2 Switch 1 to OFF Adjust the LF output gain control C13 until the meter again reads 2 volts 19 20 Figure 21 I t EX A E Setting the Subwoofer gain Disconnect the speakers from the power amplifiers Connect the MF HF power amplifier to the Subwoofer output of the unit Set the output level of the oscillator to zero and connect it to the appropriate test input socket Set the oscillator frequency to 25Hz Set Bank 1 Switch 1 to ON Set Bank 4 Switch 2 to ON Set Bank 2 Switches 2 amp 3 to OFF Connect the AC voltmeter to the output terminals of the MF HF amplifier Raise the output level of the oscillator until the meter reads 2 volts Substitute the LF power amplifier for the MF HF power amplifier Do not alter the output setting of the oscillator Set Bank 4 Switch 2 to OFF Adjust the Subwoofer output gain control C14 until the meter again reads 2 volts Configure the dipole lobe for a CT8 DS Set Bank 3 Switch
29. nel contains special effects up to approximately 140HZz Recognising that many people do not want five or more full range speakers in one room Dolby Digital and DTS systems allow for the main channels to operate with small speakers having a restricted bass extension The lowest frequencies from these channels are filtered off and added to the LFE channel to be reproduced by a subwoofer The filter cut off frequency is normally set at around 80Hz the rationale being that sound gets progressively less directional the lower the frequency and localisation becomes less important This is true to some extent but the ears can process directional information at very low frequencies and the more the bass of the main channels is extended the more realistic the sound stage becomes Many high end processors offer lower filter cut off frequencies for this very reason To preserve this directional information a CT8 SW may be added to each of the main channels as desired extending the frequency response well below 20Hz The minimum recommended configuration is to assign one subwoofer to each of the front left and right channels restoring some directional information to the action directly on the screen and full directional information to 2 channel audio programme The sense of spatial acoustic improves as more subwoofers are added to the remaining channels If higher sound levels are required for larger listening environments and greater realism up to four subwoofers
30. ont test input socket of the CT8 XO and the microphone to the input a of the sound card got 35 Open WinMLS2004 30 25 20 From the menu select Setup Load and load the setup called B amp W CT800 from the Sound System folder 100 1 000 10 000 Frequency Hz Click the i button to open the Volume and Input Levels window 22 Figure 24 Frequency response 0 2 O 2 00 23 DO 4 M 6 T 6 hi 7 C 8 D 9 T 10 V Mean SPL dB 00 1 000 10 000 Frequency Hz Figure 25 2 x Save in Tune EQ gt ey m Average resp txt File name JAverage tesp txt Save as type Dats columns Files tet v Cancel M Include Header F Individual vertical axis for each dataset Volume end Input Levene gt a F Place the microphone at the chosen measurement position that is e E Input Ch 2 closest to the speaker under test where it will measure the highest 5 sound pressure level Set the Input Ch 1 slider to maximum B y 3 3 F rg Set the Output slider to zero and switch on the test signal by 12 FR SS 45 E 15 a a 8 18 clicking the button Increase the output level until the Input Bs N ae Ch 1 level meter just goes into the red zone Decrease the Input 30 x 30 ge Fa CH 1 level until the
31. ower amplifier Switch 3 Switch 4 Condition ON ON if 4 subwoofers are connected OFF ON if 3 subwoofers are connected ON OFF if 2 subwoofers are connected OFF OFF if 1 subwoofer is connected BANK 1 Switch 1 Condition ON if input taken from front test sockets OFF if input taken from rear sockets Switch 2 Switch 3 Condition ON OFF if speaker is CT8 CC OFF ON if speaker is CT8 LR OFF OFF if speaker is CT8 DS Switch 4 is unused BANK 2 Switch 1 Condition ON if LF amplifier has same gain as MF HF power amplifier OFF if LF amplifier has different gain from MF HF power amplifier Switch 2 Switch 3 Condition ON ON if using all 3 parametric filters ON OFF if using parametric filter 1 only OFF ON if using parametric filters 1 amp 2 only OFF OFF if using no parametric filters Switch 4 is unused BANK 3 Switch 2 Condition ON Sets CT8 DS permanently to dipole mode OFF Sets CT8 DS to monopole mode but can be overridden by 12v trigger Switch 3 Condition ON Sets positive lobe of CT8 DS to left of speaker viewed from front 5 1 right surround 6 1 7 1 right side 6 1 7 1 right rear OFF Sets positive lobe of CT8 DS to right of speaker viewed from front 5 1 left surround 6 1 7 1 left side 6 1 7 1 left rear Switches 1 amp 4 are unused 18 Examples of typical DIP switch settings at the front of Front left right channel the CT8 XO GPE PE a
32. planning stage is of the utmost importance Any need to adjust speaker position for example is a much more involved process than with free standing speakers Care must also be taken to construct proper support for the speakers It is all too easy to induce the panels of custom furniture to vibrate and colour the sound unless precautions are taken to prevent it Speaker Position Figures 2 to 4 show the recommended locations in plan view for the main speakers in 5 1 6 1 and 7 1 channel installations Some dimensions are marked indicating that there is some latitude allowed each side of the figure and some have a recommended range for optimum results Subwoofers should be placed close to the main speakers to which they are assigned For successful operation of the surround speaker CT8 DS in dipole mode it is important that all listeners sit within the speaker s null zone This is the 60 wide zone of low direct sound level created by the opposing polarity drivers on each side You will notice from figures 3 and 4 that for 6 1 and 7 1 systems the side speakers are shown in line with the centre of the listening area This is suitable regardless of whether these speakers are used in dipole or monopole mode However for 5 1 systems the two surround speakers should be placed somewhat behind the listeners for effective results in monopole mode or if you wish to switch between monopole and dipole modes for different types of programme If you only e
33. quency controls C6 C9 amp C12 to the centre frequencies of the peaks or dips to be equalised This is an approximate initial setting Take repeated frequency response measurements to see the effects of the adjustments you are about to make Every now and then you may wish to discard plots and this may be done by unchecking those you do not need on the plot list to the right of the screen Adjust the filter centre frequencies until the measured dips in the response line up accurately with the centres of the peaks or dips originally in the response Adjust the filter gain controls C4 C7 amp C10 so that the response at the centre frequency of each filter is at the target level the desired smoothed level Lower the filter Q controls C5 C8 amp C11 to broaden the range of the filters until the response is as smooth as possible The controls are to some extent interactive and it may be worthwhile going round the loop of checking the control settings a second time Altering the parametric filter controls is likely to also affect the overall gain of the subwoofer and LF sections To restore the correct levels e Switch off all power amplifiers to avoid the danger of overloading the drive units e Disconnect the sound card from the test input socket e Connect the signal generator to the relevant test input socket and set the output to give a 1kHz sine wave at a level of 1V e One or other of the two output indicator lights T3
34. rain or moisture does not operate normally or has been dropped When replacement parts are required be sure the service technician has used replacement parts specified by the manufacturer or have the same characteristics as the original part Unauthorised substitutions may result in fire electric shock or other hazards For continued protection against fire hazard use fuses only of the correct type and rating Mains fuses are located inside the casing of the appliance and should be replaced only by an authorised operative Isolation of the appliance from the power supply is by means of either the switch on the rear of the appliance or removal of the power cord from the rear of the appliance or removal of the power cord from the wall power outlet Either the wall outlet or the rear of the appliance must remain freely accessible at all times while the apparatus is in use This product should be operated only from the type of power source indicated by the marking adjacent to the power cord entry If you are not sure of the type of power supply to your home consult your product dealer or local power company 19 Do not overload wall outlets extension cords or integral convenience receptacles as this can result in a risk of fire or electric shock 20 Never push objects of any kind into this product through openings as they may touch dangerous voltage points or short out parts that could result in a fire or electric shock Never spill liquid of
35. rmal programme material Test tones from oscillators and the like are not applicable The lower figure is the minimum we consider necessary to achieve reasonable listening levels without audible distortion in the smaller room less than 60 m or 2000 cu ft The higher the power you use the less likely you are to experience amplifier clipping You can often tell how good an amplifier is at driving complex speaker loads by looking at its power rating into both 40 and 80 loads The nearer the ratio is to 2 1 the better as it indicates a good current capability In order to reduce the effect the cable has on the frequency response of the speaker to inaudible levels the impedance of the cable at all frequencies measuring both positive and negative conductors in series should be kept as low as possible and certainly below 0 1Q At low frequencies the DC resistance of the cable is the dominant factor and you should choose a gauge of wire sufficient to achieve the impedance requirements over the length of cable you need to use At mid and high frequencies the inductive component of the impedance can dominate the DC resistance This and other properties influenced by the detailed construction of the cable become important 26 Running In The performance of the speakers will change subtly during the initial listening period If they have been stored in a cold environment the damping compounds and suspension materials will take some time to recover their
36. round noise and electrical interference switch off all sources in the room such 5 TI a as air conditioning refrigerators etc 10 R i ms Wy 4s im Pg eee Laptop computer settings 704 LIL LS I 5 5 TTT i I ae ala Egi Run the laptop from its battery and disconnect its transformer power supply when taking measurements This es Bh i al el will prevent noise being generated by electrical grounding mismatches between the laptop sound card and 50 I CT8 XO Make sure the battery is fully charged before starting the measuring procedure 45 i Open the Sounds and Audio Devices window in Control Panel Click on the Sounds tab and select the 39 I No Sound option in the Sound Scheme drop down menu 20 F an u SR 1000 i E3 F 000 Click on the Volume button in the Sound Playback section and make sure the Microphone Mute box is Frequency Hz checked to prevent feedback Click on the Audio tab and then on the Volume button in the Sound Recording section Set the volume Figure 23 slider to maximum and make sure the Select box is checked Frequency response 100 2 Set Bank 1 switch 1 to ON to accept an input from the front of the CT8 XO 854 80 Set Bank 2 switches 2 and 3 to OFF to disable the parametric equalisers 70 Set the Low and High frequency contour controls C1 amp C2 to zero 2 65 60 amp E 4 Connect the output of the sound card to a fr
37. so not advisable to make corrections to a single position measurement The response of the speaker room combination can differ considerably throughout the room and it is all too easy to worsen the response in one position whilst making it better in another An average of several measurements taken at different positions throughout the room should ideally be used to ensure an overall improvement in all listener positions The Method We suggest taking measurements at each seat position and at several points outside the immediate listening area Point the microphone towards the speaker being measured The resonances change with height Often seats will be at the same level so put the microphone at a typical ear height If the home theatre room is like a mini cinema with regular rows of raked seating measure at each seat at the likely ear height Do not hand hold the microphone during measurements Use a tripod or other means of holding it still It is advisable to make the last measuring position n the one used for subsequent equalised measurements the primary listening position 21 Figure 22 Procedure Frequency response 09 TT TT FREE To avoid errors from airbourne backg
38. to a standard drywall up to the level of the side firing drivers the CT8 DS has a relatively shallow cabinet for its height and is front heavy To maintain stability it is equipped with a bracket that enables the rear of the cabinet to be anchored either to a wall surface or the internal studding of a drywall In existing construction Use a stud finding tool to locate the position of the vertical studs and ensure that the speaker is positioned between them If the speaker is to be mounted above floor level cut into the drywall panel to expose the stud frame sufficiently to allow the insertion of a cross brace at the appropriate height to support the speaker Safety Warning Ensure the cross brace is level and fitted strongly enough to take the substantial weight of the speaker The speaker can be supported by the cross brace and the retaining bracket alone if desired or a more complex support structure may be constructed for example to hide the underside of the cabinet Using the front aspect template provided mark round the outline at the desired position of the speaker Allow a little for clearance If mounting the speaker at floor level allow extra height if there is a horizontal stud at floor level Cut out the aperture for the speaker Using the front aspect template provided mark the centre line of the retaining bracket on the inside surfaces of the two vertical studs either side of the speaker position Screw the two ang
39. to the relevant CT8 DS speakers The TRIGGER IN and TRIGGER LOOP sockets are mono 3 5mm jacks with the positive 12V wire connected to the tip of the plug whereas the TRIGGER OUT socket is a stereo 3 5mm jack on both the CT8 XO and CT8 DS loudspeaker Figure 18 shows the wiring diagram of a typical 5 1 CT800 system having two CT8 SW speakers one assigned to each of the front left and right channels Figure 19 LF Contour 6 FR 4 rr aaas AA 2 a ee el o 2 4 26 Ll 10 100 1000 10000 HF Contour 6 4 2 _ ee tes ees ed el o Hoot 2 4 6 T 100 1000 10000 100000 Figure 20 ir IT EEE noe aaa I L mees m Description of Controls Description of controls The unit features a comprehensive set of controls to tune the performance of each speaker according to the conditions of use The response may be shaped by a combination of three parametric equalisers each having a level range of 4 5 12 dB and low and high frequency contour controls the effects of which are illustrated in figure 19 In addition level controls are provided to compensate for any differences in gain between both the subwoofer and LF power amplifiers compared to the MF HF power amplifier To access
40. tributor in the country of residence who will advise where the equipment can be serviced You can call B amp W in the UK or visit our web site to get the contact details of your local distributor To validate your warranty you will need to produce the warranty form completed and stamped by your dealer on the date of purchase Alternatively you will need the original sales invoice or other proof of ownership and date of purchase IMPORTANT SAFETY INSTRUCTIONS The CT8 XO active crossover is a powered device Before use please read and heed the following instructions Caution To reduce the risk of electric shock do not dismantle the apparatus and do not expose the apparatus to rain or moisture No user serviceable parts inside Refer servicing to qualified personnel CAUTION DO NOT OPEN Explanation of Graphical Symbols The lightning flash within an equilateral triangle is intended to alert you to the presence of uninsulated dangerous voltage within the product s enclosure that may be of sufficient magnitude to constitute an electric shock to persons The exclamation point within an equilateral triangle is intended to alert you to the presence of important operating and maintenance servicing instructions in the literature accompanying the appliance WARNINGS 1 Read these instructions 2 Keep these instructions 3 Heed all warnings 4 Follow all instructions 5 Do not use this apparatus near water 6 Clean onl
41. ure 6 10 Mounting the speakers For optimum performance it is important that the speakers are firmly and securely mounted All the speakers may be mounted directly at floor level but as mentioned above it can be beneficial to raise the position of the surround speakers and if the screen is high it may also be beneficial to do the same with the front speakers In that case the supporting structure for the speakers should be substantial If constructed of wooden studding the framework should be arranged to be directly beneath the feet of the speaker figure 6 All the speakers are equipped with roller glides on the base panel These allow the speakers to be easily pushed into place in custom furniture In order to position the speakers accurately we suggest you create circular recesses 15mm 5 8 in diameter in the support surface to locate the glides To avoid rocking when the speakers are in position it is important that these recesses are accurately positioned and a foot positioning template is supplied for this purpose The shaded area at the front of the template is to allow clearance for the movement of the bass cones For the CT8 DS the side firing drive units require free acoustic access into the listening room indicated by the shaded area of the template extending round the sides The CT8 DS will normally have the front half of the cabinet protruding clear into the room It may however be bui
42. ver intend to use them in dipole mode the two surround speakers should revert to the in line position Please read the discussion on surround modes in the next section for a clearer understanding of the benefits of each type For larger audience sizes a more even coverage of the surround sound field may be obtained if the surround speakers are elevated above ear height as in a commercial cinema In that case the speakers may be raised so that the midrange tweeter array is approximately 60cm 2 ft above seated ear height For correct operation of the CT8 DS in dipole mode it is important not to obstruct the side firing drivers The speaker should be mounted with at least the front portion containing the side firing drivers protruding into the room and any customised covering should be acoustically transparent Figure 5 fa 6 Surround speaker dispersion mode Surround speakers generally fall into two main types those that one might describe as normal speakers so called monopoles where the sound comes from a set of drive units mounted on the front of the enclosure and those that give a more diffuse sound field such as dipoles Each type has its advantages Most multi channel music is recorded with home entertainment in mind and is monitored using monopole surround speakers whatever the multi channel recording format This enables better location of side and rear images although the formation of such im
43. y There will now be no plots showing on the screen Make sure the Overlay button R is in the down state Click or press the F2 key to re measure the response at the last position This time on the screen you will be presented with the mean response Examine this mean response and consider the optimum target to aim for A flat in room response is not desirable Studies show that a more suitable target is a response that is flat up to 100Hz and then falling uniformly by a total of 6dB by 10kHz Tune the parametric filters first before using the low and high frequency contour controls There are three filters each having adjustable centre frequency gain and Q Aim to suppress peaks first Only if there are fewer than three significant peaks should you consider filling in dips Set Bank 2 Switches 2 amp 3 according to the number of filters required Set the P all gain control C3 to zero The markings on the filter control dials are approximate and for guidance only Set the individual filter gain controls C4 C7 amp C10 to 14dB Set the individual filter Q controls C5 C8 amp C11 to approximately 4 This enables the centre frequency response of the filters to be readily seen Set the individual filter frequency controls C6 C9 C12 initially to 500Hz This keeps the filters away from the frequency range of interest until they are tuned one at a time to compensate the frequency response Turn the filter fre
44. y with dry cloth 7 Do not block any ventilation openings Install in accordance with the manufacturer s instructions Owner s Manual Do not install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat Do not defeat the safety purpose of the polarized or grounding type plug A polarized plug has two blades with one wider than the other A grounding type plug has two blades and a third grounding prong The wide blade or the third prong are provided for your safety If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus Only use attachments accessories specified by the manufacturer Use only with the cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus When a cart is used use caution when moving the cart apparatus combination to avoid injury from tip over Unplug this apparatus during lightning storms or when unused for long periods of time Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as power supply cord or plug is damaged liquid has been spilled or objects have fallen into the apparatus the apparatus has been exposed to
Download Pdf Manuals
Related Search