MediaDesk™ 5.1 Upgrade
Contents
1. 11 Us v 1 E 11 eo 1 E v 1 li Ui v 1 11 v 1 Ct ss 11 1 1 U 1 5 2 P P BD do to 1 11 1 ce 0 rm A A P 11 a 4 P 0 0 C o NANNY 11 U 11 11 I v vi U 11 11 1 11 a NE S a C a C Oe onono n JON M dj 0 aoa 8 ee o POE PO OH PLO ote tk LFE PO Hod LFE GAIN 25 0000000800 ND 068 10dB k k ee ree REF 7 9 m MASTER 3 OFF o P A A GAIN 6 VAN ud O SALA jal LY ee 4 f vp 5 a lO G 6 aa J u EMOTE RS Ls CENTER USE MEDIADESK REMOTE ONLY M A 0 made in China _ N 10 11 avoid short circuits between output terminals Amplifier Heatsink The heatsink provides essential cooling to the amplifiers inside MediaDesk Please ensure that proper air circulation is available for proper cooling 8 A Tour of the MediaDesk 5 1 Remote 1 Remote Control RJ 11 Connector This standard six conductor RJ 11 jack Is used to connect the 5 1 Remote to the MediaDesk 5 1 Upgrade Am2. enjoy 11 MediaDesk Technical Information This next section outlines the components specifications and performance data that make this product such a uniquely high value In order to continually improve all of its products Blue Sky reserves the right to change these specifications without notice MediaDesk 2 1 Specifications General Specifications Input Impedance all inputs 90k Ohms balanced Input attenuator 12 dBu 52k Ohms balanced Input attenuator 24 dBu 5k Ohms unbalanced RCA input Common Mode Rejection Ratio 40 dB typical 60Hz Maximum Input Level 12 424 dBu balanced 14 dBu unbalanced Subwoofer maximum output 924 dBu balanced Subwoofer output impedance 200 ohms balanced balanced input only Set by input attenuator Amplifier power output Note Long term power output is limited by the speaker protection circuitry Short term power output 1 channel driven 65 watts x 1 lt 05 THD into 4 ohms 1 kHz Short term power output 2 channels driven 55 watts x 2 lt 05 THD into 4 ohms 1 kHz Subwoofer power output 65 watts x 1 lt 05 THD into 4 ohms 50 HZ Mains voltages 115 230V 50 60 HZ switchable Maximum power consumption 380 watts MediaDesk 5 1 with 3 channel upgrade Note Long term power limited by speaker protection circuit Input Impedance all inputs 20k Ohms balanced Input attenuator 12 dBu 52k Ohms balanced Input attenuator 94 dBu 5k Ohms unbalanced RCA input
3. Blue Sky International 70 Sea Lane Farmingdale NY 11735 www abluesky com 5 MediaDesk 5 1 Upgrade Owner s Manual Version 1 5R July 16 2004 Contents Important Safety Instructions 000 Page 3 1 MediaDesk 5 1 Upgrade Introduction Page4 9 Important notes about this Owner s Manual Page 4 2 5 1 Upgrade What is included Page 4 4 Upgrade Installation Page 5 5 System Signal Connections Page 6 6 5 1 Speaker Placement se Page 7 7 A Tour of the MediaDesk 5 1 Amplifier and I O Page 8 8 A Tour of the MediaDesk Remote Page 9 9 System Logic Outline Page 9 10 Expanded 5 1 Calibration Guide Page 10 11 Technical Information Page 11 12 Satellite Cabinet Dimensions 000 Page 12 13 MediaDesk 5 1 Remote Dimensions __ Page 13 14 Factory Service Instructions 000000 Page 14 15 General Contact Details 0 Page 14 Contents Safety Instructions CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN AVIS RISQUE DE CHOC ELECTRIQUE NE PAS OUVIR READ INSTRUCTIONS Read all safety and operating instructions before operating this product RETAIN INSTRUCTIONS Retain these safety and operating instructions for future reference HEED WARNINGS Follow all warnings on this product and in the operating instructions FOLLOW INSTRUCTIONS Follow all operating and use instructions ATTACHMENTS Do not use attachments not recommended by the product manufacturer as they may cause haz
4. 5 1 MediaDesk System on power up remote connected The remote volume control takes over The trim pots position determines the relative volume level for each channel 6dB in 1dB increments The 5 1 Master Gain control on the back of the subwoofer is defeated 3 5 1 MediaDesk System remote unplugged during operation Reverts to the state describe above in item 1 4 5 1 MediaDesk System connect remote during operation Reverts to the state described above in item 2 IMPORTANT NOTE After the 5 1 Upgrade has been installed the user must switch the 2 1 5 1 Mode switch to 5 1 If this switch is left in the 2 1 mode the upgrade will not work This switch can be found on the main 2 1 MediaDesk amplifier Figure 8 CENTER 101 2 2 d i She 23 51 ye 4 gt MediaDesk 5 1 Volume Control Page 9 10 Expanded 5 1 Calibration Guide INSTRUCTIONS FOR ELECTROACOUSTICS CALIBRATION OF A 5 1 AUDIO SYSTEM USING A SPL METER AND BLUE SKYS TEST FILES Step 1 Step 2 Before starting this procedure you will need to download BlueSkyTestFiles zip 18MB by going to www abluesky com calibration To download the test file Right Click and select Save Target As and the file will begin downloading Once downloaded either burn the test files to a CD or import them into your DAW and follow the in
5. Common Mode Rejection Ratio 4008 typical 60Hz balanced input only Maximum Input Level 19 94dBu balanced Set by input attenuator 14 dBu unbalanced Short term power output 5 channels driven 45 watts x 5 lt 07 THD into 4 ohms 1 kHz Volume control range 50 dB in 1 dB steps Channel trim range 6 dB in 1 dB steps Lfe gain range 0 10 dB switchable Satellite e Lacquer finished baffle e Low diffraction front baffle design with flush mounted drivers e Solid 3 4 MDF enclosure with 1 MDF baffle e Dimensions Please see Satellite Cabinet Dimensions e Weight 5 los e 1 4 x 20 inserts for attachment of OmniMount e 3 8 x16 Insert for attachment to microphone stand with adapter adapter not supplied e 4 cast frame Neodymium hemispherical woofer e 1 fabric dome Neodymium tweeter e Fully video shielded e Satellite Low Frequency Crossover 110 Hz e Tweeter Crossover Frequency 9 0 kHz The following specifications are measured using the MediaDesk Amplifier e Freguency Response Satellite 9 508 300 to 10 kHz 3 0dB 110 to 20 kHz e Voltage Sensitivity at reference gain 129 dBu 90dBSPL 1M Balanced Input attenuator set to 12 dBu 1 dBu 90 dB SPL 1M Balanced Input attenuator set to 24 dBu 940 90dBSPL 1M RCA input 4 ohm nominal impedance 8 Sealed Box Subwoofer e Fully video shielded e Vented motor e Foam surround e Coated non resonance paper cone e Solid 3 4 MDF constructio
6. standard pro audio mixer The XLR inputs can handle up to 24dBu of signal level at the input and are compatible with most If not all professional gear If your mixer has TRS outputs you should purchase TRS to XLR cables found at most pro audio retailers and feed the XLR input We recommend this because TRS outputs are also balanced signals and you should use them with the XLR input as opposed to the RCA input for the best performance RCA INPUTS Figure 3 The RCA inputs on MediaDesk are compatible with a myriad of consumer and computer audio gear such as mixers CD players audio pre amps surround pre amps etc Figure 3 shows another common application the RCA inputs on MediaDesk being fed by the output of a standard computer sound card This requires the use of an optional adaptor cable to go from the 1 8 stereo jack to two RCA outputs These cables are available from most electronic retailers computer stores and pro audio dealers Consult the manual or help files that came with your sound card for specific setup information Please confirm that the software settings are not constraining or limiting the response of the system in any way often an issue with laptop computer audio settings Speaker Level Outputs SAT speaker level inputs Figure 4 This drawing shows the proper way to insert bare wire into the binding posts which are on the subwoofer outputs and SAT inputs When inserting bare wire please make sure that there are no
7. returned UPS Ground UPS Red will be returned UPS Red etc This only applies to products serviced under the warranty 14 General Contact Details For sales and other enquiries please contact Blue Sky at Blue Sky International 70 Sea Lane Farmingdale NY 11735 USA tel 516 249 1399 fax 516 249 8870 email info abluesky com To discover the very latest information check out our website at www abluesky com Page 15 Blue Sky International 70 Sea Lane Farmingdale NY 11735 www abluesky com
8. strands protruding out that may create a short circuit These binding posts are compatible with wire gauges up to approximately 12 gauge A note about the LFE Channel LFE Input The LFE Channel was originally designed for film applications as a way to extend the low frequency head room not frequency response of the playback system This additional headroom was created by adding 109B of in band gain to the LFE channel This channel is designed to be used when no additional LF headroom is availaole in the other channels As an example you may use the LFE channel to increase the dynamic low frequency content of a movie that has many large explosions It is important to note that no significant audio should be sent exclusively to the LFE channel The reason for this is that if a Dolby Digital audio track is folded down to 2 channels the LFE channel will not be added to the fold down mix all other channels will be added to the fold down Page 6 Figure 2 MIXER OOOOOOOOOOOGOGOGOGOG OOOOOOOOOOO L C R U RS LFE OOOOOOOOOOO OOOOOOOOOOOOO OOOOOOOOOOOOO MD REMOTE RIGHT CENTER LEFT Figure 3 3 5MM STE
9. to service this product yourself Opening or removing covers including any over bottom or side speaker drivers may expose you to dangerous voltage or other hazards Refer all service to qualified service personnel DAMAGE REQUIRING SERVICE Unplug this product from the wall outlet and refer servicing to qualified personnel under the following conditions a When the power supply cord or plug is damaged If liquid has been spilled or objects have fallen into this product 6 If the product does not operate normally by following the operating instructions Adjust only controls that are covered by the operating instructions as an improper adjustment of other controls may result in damage and will often require extensive work by a qualified technician to restore the product to its normal operation d Ifthe product has been dropped or damaged in any way e When the product exhibits a distinct change in performance this indicates a need for service REPLACEMENT PARTS 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 Unauthorized substitutions may result in risk of fire electric shock or other hazard SAFETY CHECK Upon completion of any service or repairs to this product ask the service technician to perform safety checks to determine that the product is in proper operating condition HEAT This pro
10. REO PHONE PLUG RED diaDesk 1 cae a BLACK SET LS RS ST SWITCH T TO 5 1 5 1 SOUND CARD B s B 50 o o o o a a a a 6 o O MD REMOTE Figure 4 6 5 1 Speaker Placement 0 Satellite Speaker Placement 6 The recommended monitoring angle for proper stereo imaging with music is 60 degrees between the left and right speakers The center channel speaker should be located on axis with the reference monitoring position and both the left and right surround channel speakers should be at an angle of 110 degrees from the centerline In most applications surrounds used for music are placed at the same height as the front speakers for a direct sound field See Figure 5 Satellite Soeaker Placement FILM POST PRODUCTION Although the above recommendations should work equally well for both film and music production there may be situations where a more film optimized setup is desirable To correctly relate audio to picture the recommended angle between left and right speakers is 45 degrees This narrower monitoring angle should still yield a very satisfactory stereo image As with the music setup e Reference Monitoring Position the center channel spea
11. also be helpful to have access to the 2 1 manual which was included with the MediaDesk 2 1 System If you can not find this manual it can be downloaded from www abluesky com support Please read this owner s manual carefully heed all warnings and contact Blue Sky international if you have any comments or questions Contact information can be found on page 16 or you can visit www abluesky com 2 1 5 1 Mode Switch IMPORTANT NOTE After the 5 1 Upgrade has been installed the user must switch the 2 1 5 1 Mode switch to 5 1 If this switch is left in the 9 1 mode the upgrade will not work This switch can be found on the main 2 1 MediaDesk amplifier 2 1 5 1 Mode Switch 2 1 O 5 1 0 upgrade installed MediaDesk 5 1 Upgrade what is included A MediaDesk 5 1 Upgrade package includes the items listed below Please carefully unpack each item and inspect the components for damage If any part of the system has been damaged please contact the dealer that supplied the product or Blue Sky directly MediaDesk 5 1 Upgrade Inventory 3 MediaDesk Satellite Speakers SATS 1 MediaDesk Upgrade Amplifier 1 Plastic tie wrap 3 15 Foot lensth of copper speaker cable 3 MediaDesk Angle Adjustment Feet 1 MediaDesk 5 1 Remote with cable 1 Owner s Manual 1 Warranty Cara 4 5 1 Upgrade Installation IMPORTANT Before starting turn off the power to the subwoofer and unplug the power ca
12. ards WATER AND MOISTURE Do not use this product near water for example near a bathtub washbow kitchen sink or laundry tub in a wet basement or near a swimming pool and the like ACCESSORIES Do not place this product on an unstable cart stand tripod bracket or table The product may fall causing serious injury to a child or adult and serious damage to the product Use only with accessories recommended by the manufacturer or sold with the product Any mounting of the product should follow the manufacturer s instructions and should use a mounting accessory recommended by the manufacturer POWER SOURCE This product should be operated only from the type of power source indicated on the marking label on the back of the product It is IMPORTANT to confirm that the voltage selector switch on the back of the subwoofer is set to the proper voltage setting If you are unsure of the tyoe of power that is supplied to your home consult your product dealer or local power company OVERLOADING Do not overload wall outlets or extension cords as this can result in a risk of fire or electric shock WARNING T0 reduce the risk of fire or electrical shock do not expose this equipment to rain or moisture Do not remove cover No user serviceable parts inside Refer servicing to qualified personnel 10 11 12 13 14 15 LIQUID ENTRY Never spill any liquid of any kind on the product SERVICING Do not attempt
13. are unbalanced RCA type inputs that are designed to work with 10 ABV sources such 85 consumer sound cards CD players IM some mixers etc Refer to page 6 for more information System Signal Connection RS Right Surround XLR IN This XLR input should be connected to the right surround outout of your console or digital workstation The input is electronically balanced Do BE not connect more than one source to this inputs Refer to page 6 for more information System Signal Connection C Center XLR IN This XLR input should be connected to the center channel output of your console or digital workstation The inous is electronically balanced Do not connect more than one source to this Input Refer to page 6 for more information System Signal Connection 8 C LFE Center and LFE RCA IN These are unbalanced RCA type inputs that are designed to work with 10 dBY sources such as consumer sound cards CD players some mixers etc Refer to page 6 for more information System Signal Connection and Level Setting LFE LFE XLR IN This XLR input should be connected to the LFE output of your console or digital workstation The input is electronically balanced Do not connect more than one source to this input Refer to page 6 for more information System Signal Connection LFE Gain Switch OdB 10dB Generally this should be set to the 10dB setting as recommend by Dolby www dolby com Refer to page 6 for more informatio
14. ble Tools Required 1 Medium Phillips head screwdriver 9 Wire cutters or utility scissors Step 1 Turn off the power to the subwoofer and unplug the power cord WARNING Do not attempt to install the 5 1 Upgrade when the power cord is connected Step 2 Using a Phillips head screwdriver remove the 8 screws holding the blank panel and remove the panel as shown in the pictures below Step 3 panel Remove the clip holding the two wiring harnesses to the inside Step 4 Bend the wire clip that was holding the wiring harnesses down and parallel to the inside panel shown below Step 5 Before proceeding to step 6 carefully locate both J18 and J10 on the Upgrade Amplifier assembly See Figure 1 Step 6 Plug the 3 pin connector into J10 which is located on the smaller printed circuit board pictured in Figure 1 The connector has a locking tab that locks onto the raised plastic edge of the receptacle which faces the outside edge of the board Carefully press the connector onto this terminal until the connector locks onto the receptacle pictured below NOTE If you have to remove connector for any reason depress the locking tab and gently pull the connector out of the receptacle Figure 1 E i A 1 2 E 7 00 EE EO ET VU T o ON 9 5 c Step 7 Plug the 8 pin ribbon cable into the matching receptacle on the larger PC board J18 in Figure 1 The plug on the ribbon ca
15. ble has two arrows on it that match up with the two slots in the receptacle Gently push the plus until it is fully seated in the receptacle picture below Step 8 Carefully tuck all the wires out of the way If the three wire harness is too long use the supplied tie wrap to bundle the excess wire plastic tie wrap Note Make sure no wires are trapped between the backplate and the cabinet Step 9 Put the upgrade amplifier into the opening on the back of the subwoofer and attach it to the subwoofer cabinet using the 8 screws that were removed in step 2 pictured below As mentioned in the note above make sure no wires are trapped between the backplate and the cabinet WARNING Do not over tighten the screws holding the amplifier to the subwoofer or you may strip them If you are using an electric screwdriver or variable speed drill set them to the lowest torque setting Page 5 5 System Signal Connections Below are some basic outlines of ways someone may interface MediaDesk with their audio system These may or may not apply to your specific application but they should be able to show the basic concept for most applications CABLE WIRING SPECIFICATIONS Most users of the MediaDesk system will be using ready made cables however if you need to wire your own cables follow the wiring specifications below HOT XLR INPUTS ELECTRONICALLY BALANCED Figure 9 shows the XLR inputs being fed from the output of a
16. ctions Page 14 Review the manual and ensure that you have followed all setup and operating instructions Call 516 249 1399 9 00am to 5 30pm EST and ask for Customer Service Explain the problem and request an RA Return Authorization number It is important to have your product serial number availaole when you call You must have an RA number before you can obtain service Pack the product in its original packing material and box do not return the power cord or the manual If you don t have the original packing material and or box please let Customer Service know when you call for the RA number Blue Sky is not responsible for any damage that occurs due to non factory packaging Include a legible note stating your name shipping address no PO boxes daytime phone number RA number and a detailed description of the problem including how it can be duplicated Write the RA number on the top of the carton Ship the product to the address below We recommend United Parcel Service UPS Please insure the product regardless of shipping method Blue Sky International ATTN SERVICE DEPT RA 70 Sea Lane Farmingdale NY 11735 USA Turnaround time is three to five business days depending on the problem When calling for RA numbers please ask Customer Service what the turnaround time is The serviced product will be sent back to you via the same shipping method as received i e If you ship your monitor UPS Ground it will be
17. duct should be situated away from heat sources such as radiators heat registers stoves or other products that produce heat Page 3 MediaDesk 5 1 Upgrade Introduction Blue Sky is a philosophy We design each product to represent the highest ratio possible of performance to cost providing the highest value added to our customers 1 We will continually seek out opportunities to utilize the talent of the Blue Sky team to realize this philosophy Our customer s value requirements will always be our prime focus and only those products that achieve our performance value ratio will earn the right to carry the Blue Sky logo To that end we are proud to introduce the MediaDesk 5 1 Upgrade The MediaDesk 5 1 Upgrade transforms a standard MediaDesk 2 1 System into a state of the art 5 1 professional monitoring system which is ideally suited for computer driven audio recording and production We hope that this systems brings you years of accurate and problem free operation We ask that you take the time to read this manual resister the product and visit our website for any updated information regarding this product If you have any questions please don t hesitate to contact us www abluesky com Thank you for choosing Blue Sky Page 4 Important notes about the MediaDesk 5 1 Upgrade and this Owner s Manual The Owners Manual This manual addresses MediaDesk 5 1 Upgrade installation and applications For reference it may
18. ker should still be located on axis with the reference monitoring position Unlike music surrounds which SPEAKER PLACEMENT AS DOCUMENTED IN tend to be direct in nature film surrounds are usually positioned RECOMMENDATION ITU R BS 775 1 for a more diffused sound field to simulate the effect of an array of surround speakers used in a theater For a single pair of surrounds this can be accomplished by placing them two feet above seated ear height to the side of the monitoring position and slightly behind the mix position Satellite Speaker Monitoring Height Recommendations Figure 6 It is recommended that all of the satellite soeakers be placed at or 3 about seated ear height as shown in Figure 2 If it is not possible 0000000000 to place the speakers at or about seated ear height please aim the speakers at the monitoring position Subwoofer Placement Please see page 10 in the MediaDesk 2 1 System Manual Subwoofer Placement Guide MediaDesk SAT at seated ear height O Page 7 7 10 11 8 Page 8 A Tour of the 5 1 MediaDesk Amplifier E and I O LS Left Surround XLR IN This XLR input should be connected to the left surround output of your console or BE digital workstation The input is electronically balanced Do not connect more than one source to this input Refer to page 6 for more information System Signal Connection RS amp LS Right and Left Surround RCA IN These
19. n System Signal Connection A note about the LFE Channel LFE Input Master Gain This controls the overall system gain when the remote is not connected Make sure to not set this level too high in case the remote accidentally gets disconnected The 2 1 Gain control located on the main MediaDesk panel doesn t function in the 5 1 mode However the subwoofer gain control functions as described in the 2 1 manual Remote Control RJ 11 Connector This standard six conductor RJ 11 jack is used to connect the MediaDesk 5 1 Amplifier to the MediaDesk 5 1 Remote using the provided 6 conducter cable The remote control cable length should not exceed 100 Feet Refer to page 8 for more information A tour of the MediaDesk 5 1 Remote 12 High Level Speaker Outputs These connectors are high Quality binding post that are compatible with both bare speaker wire and other speaker connectors such as spades and banana plugs Please always maintain proper phase and be careful to Figure 7 13 blue sky international TM sk 70 Sea Lane y MediaDesk Farmingdale NY 11735 KP Max input 24 dBu 4120Bu HOE the HON set by input attenuator switch 1 E 1 1 1 LS A R NE Al is 7 vi 1 A Hore o E ell a A AO ON P RS LS pa oN 1 i i 1 na CYC EH Ey HB POP OH D pr o O HONBE 2 E ee
20. n with 1 MDF baffle e Flush mounted driver e Isolation feet are included e Inserts for optional attachment of spiked feet provided e Dimensions 16 H x 14 W x 15 D including heatsink and grille e Weight 45 Ibs e Frequency Response Subwoofer Anechoic Response 35 to 110Hz 3dB Typical In Room Response 90 to 200Hz 3000 Cubic Feet Page 11 12 Satellite Cabinet Dimensions T 5 750 9 000 a TT 6 250 TT 6 225 8 500 9 500 3 8 X 16 THREAD 1 4 X 20 THREAD MediaDesk SAT Dimension in US English Standard inches Page 12 13 MediaDesk 5 1 Remote a NM 1 242 4 016 _ 675 CENTER ol i 1 2 LEFT ZN 2 gt 3 SN RIGHT 6 496 MediaDesk 5 1 Volume Control T MediaDesk 5 1 Remote Dimensions in US English Standard inches Page 13 13 Factory Service Instructions Service for the U S versions of Blue Sky products Is available only from our authorized distributor Group One Ltd located in Farmingdale New York Service for Blue Sky products outside the United States can be obtained through local dealers or distributors If your monitor needs service follow these Instru
21. plifier using the provided 6 conductor cable The remote control cable length should not exceed 100 Feet Refer to page 8 for more information MediaDesk 5 1 Remote 2 Individual Output Channel Trims Each of the following recessed channel trim pots has a range of plus or minus 6cB in 1dB increments Please note that these are output level trims and not input level trims For calibration instructions see page 10 Expanded 5 1 Calibration Guide 3 5 1 Master Gain Control This knob controls the overall system level When the remote is connected the 5 1 Master Gain control on the back of the suowoofer is defeated 4 Power Indicator LED If this LED is lit the system is powered and the remote is properly connected to the MediaDesk 5 1 Monitoring System 9 System Logic Outline Unlike the a MediaDesk 2 1 System a complete MediaDesk 5 1 System uses a simple microprocessor to adjust the individual levels and overall 5 1 system gain digitally controlled analog Because how the system is configured effects how the system operates it is important to understand what happens under specific operating conditions Below is a simple outline detailing how the system operates 1 5 1 MediaDesk System on power up no remote connected The master 5 1 volume control on the back of the subwoofer controls volume see page 8 item 8 for more information The individual channel level adjustment are set to their default setting which is OdB 2
22. se note that the LFE channel gain in a 5 1 system varies from OdB to 10dB depending on the encoding format that is being used Since the LFE channel is not calibrated as a separate entity the LFE gain will not affect system calibration For more information about the LFE channel refer to page 6 System Signal Connection A note about the LFE Channel LFE Input Step 7 The common calibration levels L C R LS SUB Movie Theatrical release 85dB 85dB 85dB 82dB 82dB 85dB Movie DVD release 85dB 85dB 85dB 85dB 85dB 85dB Broadcast 85dBc or 78dB 78dB 78dB 78dB 78dB 78dB Music Stereo 85dB 85dB 85dB Music 5 1 85dB 85dB 85dB 85dB 85dB 85dB All test signals are recorded at 20dBFS including the 1 kHz sine wave tone The sine wave tone is used to set the electrical outout level throughout the signal path right up to the point you get to the speakers while the various pink noise signals are used for acoustic measurements and calibration Step 8 The following procedure assumes you are calibrating the system to 85dBC SPL If you are calibrating to TV etc substitute the appropriate level from the chart titled The common calibration levels shown above Step 9 Page 10 TURN OFF THE MONITORING SYSTEM until step 4 Remove all eq and dynamics from the signal path and set all controls to zero unity gain Play the 1kHz Sine Wave hard assign it to the left channel only and adjust the outpu
23. so you achieve the best signal to noise ratio Note If the reference level is not perfectly near a marking on the dial you may choose to adjust the level up or down and use the center channel gain trimpot to compensate Once the center channel is set to 85dBc assign the 500 2 5kHz pink noise signal to the left channel and use the trim pots to make the adjustments between the channels 6dB in 1dB increments Make sure that the master gain setting has not been changed from the reference level setting Repeat this steo for the remaining main channels Right Left Surround amp Right Surround Feed 40 80Hz pink noise signal to the center channel only Adjust the subwoofer level control on the back of the sub and the SUB trim pot until the subwoofer reads 85086 slow at the mix position The meter will bounce around a little so you will need to do a mental average tend to filter out the peaks in my mind so don t set the sub too hot The other channels should measure about the same and no additional adjustments need to be made You can play the full bandwidth pink noise assigning it to any of the main channels not at the same time You should measure about 85dBc It may be a little higher because below 30Hz the room may have a little extra gain No adjustments should be made with Full Bandwidth pink noise unless you have an RTA real time analyzer You are finished and the calibration process has been completed
24. structions below Step 3 Step 4 ADDITIONAL REQUIRED ITEMS 1 5 1 Monitoring System 9 SPL Meter such as the SPL meter sold by RadioShack in the U S 3 Small screw driver for adjusting trim pots Step 5 BlueSkyTestFiles Zip Includes 4 files 100072 SINEWAVE 20dBFS wav a 1kHz file recorded at 90dBFS for electrical calibration 40 80Hz PINK NOISE 20dBFS wav a 40Hz to 80Hz bandwidth limited pink noise file recorded at 20dBFS 500 9 5kHz PINK NOISE 20aBFS wav a 500772 to 2 5Hz bandwidth limited pink noise file recorded at 20dBFS Pink Noise full bw 20dBFS wav a full bandwidth pink noise file recorded at 20dBFS These test files are all mono files Please make sure you hard assign them to the left and then the right not both channels at the same time If you are using a CD player use only one channel of the CD player THEORY The purpose of calibration is to adjust the overall electroacoustics system gain so that OdBVU of electrical signal level equals a certain acoustic level at the listening position Since most recording media is now digital the reference electrical signal level is usually 20dBFS with 20dB of headroom The reference SPL level however can vary based on the delivery media and speaker type Please note that the bandwidth limited signals that have been provided limit many of the room interaction affects often associated with measuring SPL and broadband pink noise Step 6 Also plea
25. t fader so that the output meter reads 20d BFS If you are using an analog console set the output level to 0 VU Then hard pan the signal to the center channel output and repeat for the center channel repeat for the each of the remaining channels Once calibrated do not move the output faders Mute everything and make sure the 1kHz tone is OFF Now that the system has been electrically calibrated turn ON the MediaDesk 5 1 System Assign the 500 2 5kKHz pink noise signal to the center channel only and set the remote master gain control to a relativly low level Make sure there is nothing coming from the left or right channels or any other channels Because this signal is bandwidth limited you don t have to worry about turning the sub level down or off Note SPL should be measured at the mix position with the SPL meter at arms length the microphone at seated ear height angled at approximately 45 degrees and pointed at the center point between the left and right speakers Now increase the level of the master gain control on the remote until you measure 85dBc Once you reach 85dBc make a note of where the volume knob is relative the markings around the knob this is your reference level gain setting do not move the knob If the level is relativly low and you are using the XLR inputs you may need to adjust the inout attenuator switch on the back of the MediaDesk amplifier so that you don t overdrive the inputs and
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