1238CF Operating Manual
Contents
1. 938CF Operating Manual Genelec 1238CF DSP Loudspeaker GENELEC GENELEC Introduction Congratulations and a thank you for the purchase of this Genel ec 1238CF DSP Loudspeaker This loudspeaker is designed to integrate easily into the digital production environment There are several ways to configure and operate the DSP loudspeaker for a wide variety of high quality audio applications The 1238CF also has an analog input making it a versatile and intelligent replace ment for analog loudspeakers This manual addresses setting up and using the 1238CF DSP loudspeaker in stand alone mode without the Genelec Loud speaker Manager GLMTM and the proprietary Genelec loud speaker control network Use with the GLM is described in the DSP System Operating Manual EC Declaration Of Conformity This is to certify that Genelec 1238CF DSP loudspeakers con form to the following standards Safety EN 60065 2002 A1 2006 A11 2008 IEC 60065 2001 7th Edition A1 2005 EMC EN 55020 2007 EN 55013 2001 A1 2003 A2 2006 EN 61000 3 2 2006 and EN 61000 3 3 1995 A1 2001 A2 2005 The products herewith comply with the requirements of The Low Voltage Directive 2006 95 EC EMC Directive 2004 108 EC and Energy related Products ErP Directive 2009 125 EC le Bie Signed Ilpo Martikainen Position Chairman of the Board Date 30 September 2010 Compliance to FCC Rules This device complies with part 12. SPECIFICATIONS sogh I BES RBEHOTHEBEB GENELEC 1IIOCF verncal prune Grectrty normalize or srh J Figure 4 Vertical directivity of the 1238CF AMPLIFIER SECTION 1238CF 1238CF Lower cut off frequency 3 dB lt 55 Hz Bass amplifier short term output power 150 W at 4 Ohm load Midrange amplifier short term output power 120 W at 8 Ohm load Upper cut off frequency 3 dB gt 20 kHz 9 pan SPOLE Free field frequency response 57 Hz 20 kHz 2 0 dB Maximum short term sine wave acoustic output on axis in half space averaged from 100 Hz to 3 kHz Maximum long term RMS acoustic output in same conditions with IEC weighted noise limited by driver unit protection circuit 1 m gt 117 dB SPL 1 m gt 107 dB SPL Maximum peak acoustic output per pair with 2m gt 124dB music material Self generated noise level in half space at 1 m lt 15 dB on axis A weighted Harmonic distortion at 90 dB SPL at 1 mon axis Freq 60 100 Hz lt 1 gt 100 Hz lt 0 5 Drivers Bass 2 x 210 mm 8 cone Midrange 125 mm 5 cone Treble 25 mm 1 metal dome All drivers are magnetically shielded Weight 42 kg 93 Ib Dimensions Height 610 mm 24 Width 470 mm 187 Depth 257 mm 107 Treble amplifier short term output power Long term output power is limited by driver unit protection circuitry 120 W at 8 Ohm load Slew rate 80 V us Ampli
3. 5 of the FCC Rules Operation is subject to the following two conditions e This device may not cause harmful interference and e This device must accept any interference received including interference that may cause undesired operation Note This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equip ment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct 2 the interference by one or more of the following measures e Reorient or relocate the receiving antenna e Increase the separation between the equipment and receiver e Connect the equipment into an outlet on a circuit different from that to which the receiver is connected e Consult the dealer or an experienced radio TV technician for help Modifications not expressly approved by the manufacturer could void the user s authority to operate the equipment under FCC rules Sa
4. adjustments however careful listening with suitable test recordings can also lead to good re sults if a test system is not available Table 1 shows some typical settings in various situations GENELEC Loudspeaker Treble Bass Bass Desktop Mounting Position Tilt Tilt Roll Off Flat anechoic None None None None response Free standing in None 2 dB None None a damped room Free standing in None 4 dB None None a reverberant room Near field on None 2 dB None 4 dB a reflective surface In a corner None 4 dB 4 dB None Table 1 Suggested Tone Control settings in some typical situations Always start adjustment by setting all switches to OFF position Measure or listen systematically through the different combina tions of settings to find the best frequency balance See Table 1 for some typical settings in various situations Functions On Switch Group 2 Stored Manual Ctrl This allows the selection between two basic methods of control ling the loudspeaker in the stand alone mode MANUAL CTRL refers to controlling the loudspeaker using the controls on the loudspeaker s back panel The STORED refers to using settings stored inside the memory of the loudspeaker These settings are made using GLM and the GLM Control Network There is ad ditional functionality compared to that offered by the room re sponse correction switches on the back panel AES EBU CH This selec
5. ctly Always place the loudspeakers so that their acoustic axes are aimed towards the listening position see Figure 2 Vertical placement is mandatory to maintain cooling behind the loud speaker 4 456 mm 17 15 16 Figure 2 The location of the acoustic axis is on the center line of the enclosure at the given height Maintain Symmetry Check that the loudspeakers are placed symmetrically and at an equal distance from the listening position If possible place the system so that the listening position is on the centerline of the room and the loudspeakers are placed at an equal distance from the centerline Minimise Reflections Acoustic reflections from objects close to the loudspeakers like desks cabinets computer monitors etc can cause unwanted colouration and blurring of the sound image These can be mini mised by placing the loudspeaker clear of reflective surfaces For instance putting the loudspeakers on stands behind and above the mixing console usually gives a better result than placing them on the meter bridge Symmetrical positioning of the reflective objects is also importent in order to maintain a balanced soundstage Minimum Clearances Sufficient cooling for the integrated amplifier must be ensured if the loudspeaker is installed in a restricted space such as a cabinet or integrated into a wall structure The surroundings of the loudspeaker must always be open to the listeni
6. e Note that these controls have no effect when switch 1 STORED MANUAL CON TROL on switch group 2 is set to STORED or when the loud speaker is connected to the Genelec loudspeaker control network Bass Roll Off Control Bass Roll Off control switches 1 and 2 affects the low frequency roll off of the loudspeaker and attenuates its output near the cut off frequency Attenuation levels of 2 dB sw 1 ON 4 dB sw 2 ON or 6 dB both switches ON can be selected Bass Tilt Control The Bass Tilt control switches swiches 3 and 4 offer three atten uation levels for the bass response below 800 Hz usually neces sary when the loudspeakers are placed near room boundaries The attenuation levels are 2 dB 4 dB and 6 dB Desktop Low Frequency Control The desktop low frequency control switch 5 attenuates the bass frequencies around 160 Hz by 4 dB This feature is designed to compensate for the boost often occurring at this frequency range when the loudspeaker is placed upon a meter bridge table or similar reflective surface Treble Tilt Control Treble Tilt control switches 6 and 7 allows adjusting the treble response above 5 kHz by 2 dB 2 dB or 4 dB which can be used for correcting an excessively bright or dull sounding system or to compensate for high frequency level loss if the loudspeaker is placed behind a screen An acoustic measuring system such as WinMLS is recommend ed for analyzing the effects of the
7. ed digital input signals When the loudspeakers are not connected to a Genelec loud speaker control network they operate in stand alone mode However settings made with the Genelec Loudspeaker Manager software can be saved into each loudspeaker and applied even when the network is disconnected by setting switch 1 STORED MANUAL CONTROL on switch group 2 of each loudspeaker to position STORED This manual concentrates on using the loudspeakers without the control network All issues concerning use with the network are explained in detail in the System Operating Manual provided with the GLM Loudspeaker Manager software kit Connections Each loudspeaker is supplied with a mains cable one 5 m GLM network cable and an operating manual Before connecting up ensure that the mains switch is off MAINS INPUT Connector Connect the mains supply to this connector DIGITAL IN AES EBU Connector Use this female XLR connector for AES EBU formatted digital audio input signals This input is selected automatically when a valid digital audio signal is present and overrides the analogue input Depending on the digital hardware transmission of a 192 kHz sample rate is achieved using a double speed single channel cable interface This is called dual wire mode In this case one cable per channel is used and no channel selection is required Dual wire mode is automatically detected by the input stage If the digital sou
8. enelec com In the U S please contact Genelec Inc 7 Tech Circle Natick MA 01760 USA Phone 1 508 652 0900 Fax 1 508 652 0909 Email genelec usa genelec com In Sweden please contact Genelec Sverige Ellipsvagen 10B P O Box 5521 S 141 05 Huddinge Phone 46 8 449 5220 Fax 46 8 708 7071 Email info genelec com In China please contact Beijing Genelec Audio Co Ltd Jianwai SOHO Tower 12 Room 2605 D 1504 Chaoyang District Beijing 100022 China Phone 86 10 8580 2180 Fax 86 10 8580 2181 Email genelec china genelec com
9. er enclosure Any maintenance or repair of the loudspeaker should only be undertaken by qualified service personnel Guarantee The Genelec 1238CF is supplied with two year guarantee against manufacturing faults or defects that might alter the performance of the loudspeakers Refer to supplier for full sales and guarantee terms Accessories A wide selection of accessories is available for Genelec loud speakers Consult the Accessories Catalogue on www genelec com or your local distributor dealer for up to date information Genelec Oy 1238CF dBr vs freq Hz 3 Mar 11 Ap 20 50 100 200 500 1k 2k 5k Figure 3 The upper curve group shows the horizontal direc tivity characteristics of the 1238CF measured at 1 m The lower curve shows the systems power response Genelec Oy 1238CF dBr vs freq Hz 3 Mar 11 Ap DESKTOP LF BASS TILT BASS ROLL OFF 20 50 100 200 500 1k 2k 5k 10k 20k Hz Figure 4 The curves above show the effect of the bass tilt treble tilt desktop and bass roll off controls on the free field response s 75 4 x cs 0 Es x 4 7 13 Frequency hta Figure 5 Horizontal directivity of the 1238CF SYSTEM
10. fety Considerations Although the 1238CF has been designed in accordance with international safety standards to ensure safe operation and to maintain the loudspeaker under safe operating conditions the following warnings and precautions must be observed e Servicing and adjustment must only be performed by qualified service personnel The loudspeaker enclosure must not be opened e Do not use this product with an unearthed mains cable or a mains connection without the protective earth contact as this may lead to personal injury To prevent fire or electric shock do not expose the unit to water or moisture Do not place any objects filled with liquid such as vases on the loudspeaker or near it Note that the amplifier is not completely disconnected from the AC mains service unless the mains power cord is removed from the amplifier or the mains outlet Free flow of air behind the loudspeaker is necessary to maintain sufficient cooling Do not obstruct airflow around the loudspeakers Note that the amplifier is not completely disconnected from the AC mains service unless the mains power cord is removed from the amplifier or the mains outlet WARNING The Genelec 1238CF loudspeaker is capable of producing sound pressure levels in excess of 85 dB which may cause permanent hearing damage System The Genelec 1238CF DSP Loudspeaker is designed for precise monitoring of 24 bit 192 kHz AES EBU digital audio signal or li
11. fier system THD at nominal output lt 0 05 Signal to Noise ratio referred to full output Bass gt 100 dB Midrange gt 100 dB Treble gt 100 dB Mains voltage 100 200 or 115 230 V Mains voltage operating range 10 to 10 Power consumption average Idle 23 VA Full output 330 VA SIGNAL PROCESSING SECTION 1238CF Digital signal input connector XLR female 110 kOhm Digital signal output Thru connector XLR male 110 kOhm Analog signal input connector XLR female balanced 10 kOhm AES EBU Single Wire or Dual Wire AES EBU Single Wire or Dual Wire pin 1 gnd pin 2 pin 3 Digital audio Word length Sample rate Control network 16 24 bits 32 192 kHz Type Proprietary GLM network Connection 2 RJ45 CAT5 cables Crossover frequency Bass Mid 420 Hz Mid Treble 2 8 kHz GLM software frequency response adjust ment Notch filters 4 LF and 2 HF Shelving filters 2 LF and 2 HF System calibration The notch and shelving filters adjustments AutoCal and GLM manual system calibration features are part of the Genelec Loudspeaker Manager GLM software Auto Cal Stand alone 1238CF Operating Manual Genelec Document D0100R001 Copyright Genelec Oy 10 2010 All data subject to change without prior notice www genelec com GENELEC International enquiries Genelec Olvitie 5 FIN 74100 lisalmi Finland Phone 358 17 83881 Fax 358 17 812 267 Email genelec g
12. lly the Level control should be set to force the use of more of the input range of the A D converter without overloading it Re member there is no headroom above the maximum input to the A D conversion CONTROL NETWORK Connectors Use these RJ 45 sockets to connect the loudspeaker to the pro prietary Genelec Loudspeaker Manager GLM network only This connector is not Ethernet LAN compatible Do not con nect to Ethernet LAN 12 V REMOTE Connector You can set up remote controlled powering up and down of the 1238CF with 12 V 60 mA trigger voltage connected to this con nector Front Panel Warning Light Normally the light on the front panel of a 1238CF loudspeaker is green indicating that the loudspeaker is in normal operational mode The overload light red is activated by several events e exceeding the maximum input range of the analog input e exceeding the maximum input range of the digital input with large probability e exceeding the output capacity of the power amplifier clipping in the power amplifier and thermal overload of the power amplifier or loudspeaker drivers thermal protection has activated e if an error is detected in the AES EBU audio data If a red warning light appears turn the source down If the levels are already modest and a digital signal is being used ensure that there are no bit errors in the AES EBU digital audio data Mounting Considerations Align the Loudspeakers Corre
13. nalog Subwoofers with the 1238CF DSP Loudspeakers Genelec recommend the use of DSP subwoofers 7200 Series with DSP loudspeakers However it is also possible to use ana log subwoofers Please follow the steps below to integrate an analog subwoofer into a system of DSP loudspeakers e Connect cables carrying analog audio to the 7000 Series analogue subwoofer first e Connect the subwoofer outputs to the analog inputs of the 1238CF DSP loudspeakers e Connect the GLM Control Network to the loudspeakers e Make a System Setup in GLM It will consist of only loudspeakers as this is all the network can see so suitable Rapid Cabling Presets are Stereo Pair Analog and 5 0 Surround System Analog e Run AutoCal and review and the results to check for large dips at or above 85 Hz Move the loudspeakers and repeat AutoCal if there is a problem Press Finish then in the Main Page select Menu Store Acoustic Settings to All Online Loudspeakers and close GLM e For each DSP loudspeaker turn it off select Stored on the back of each loudspeaker to enable the internal Acoustic Settings and then turn it on again e To set the phase control on the subwoofer connect the Center channel output of the subwoofer to the loudspeaker to be used to align phase e Follow the instructions in the subwoofer user manual for setting phase and level Maintenance No user serviceable parts are to be found within the loudspeak
14. ne level analog audio signal The 1238CF is fully compatible with Genelec Loudspeaker Manager GLM and the proprietary Genelec loudspeaker control network and Genelec 7271A DSP Active Subwoofer but can also be used independently of these The 1238CF features high SPL output and low colouration in GENELEC MAINS POWER SWITCH GLM CONTROL NETWORK CONNECTORS MAINS INPUT CONNECTOR MONITORING SYSTEM MAGNETICALLY SHIELDED MADEINFINLAND wwwgenelec com 12V REMOTE CONNECTOR STAND ALONE USER INTERFACE LEVEL CONTROL STAND ALONE USER INTERFACE SWITCH GROUPS 1 AND 2 ANALOG INPUT CONNECTOR DIGITAL THRU CONNECTOR DIGITAL INPUT CONNECTOR Figure 1 Connectors and controls on the back panel of the 1238CF a small enclosure size It is suitable for a wide variety of tasks such as near field monitoring mobile vans broadcast and TV control rooms surround sound systems and home studios The advanced Directivity Control Waveguide DCW technology provide excellent frequency balance even in difficult acoustic environments Amplifiers The amplifier unit is mounted in the rear of the loudspeaker en closure The unit incorporates special circuitry for driver thermal overload protection Variable input sensitivity allows accurate level matching to console output section Using the Loudspeakers in Stand Alone Mode The 1238CF accepts both analogue line level input signals and AES EBU formatt
15. ng room with a minimum clearance of 5 centimeters 2 behind above and on both sides of the loudspeaker The space adjacent to the loud speaker must either be ventilated or sufficiently large to dissipate heat so that the ambient temperature does not rise above 35 degrees Celsius 95 F Setting the Input Sensitivity The loudspeaker level sensitivity functions for both analog and digital input The sensitivity can be matched by adjusting the ro tary Level control together with the System Level switches lo cated in the switch group 2 switches 6 and 7 The switches provide attenuation levels of 10 dB sw 6 ON 20 dB sw 7 ON and 30 dB both switches ON The combined attenuation ranges from 0 to 42 dB Functions On Switch Group 1 Tone Controls Switch group 1 the upper switch group comprises the tone con trols that can be used to adjust the frequency response of the system in stand alone mode to match the acoustic environment Please note that the GLM Loudspeaker Controller allows a much more versatile and precise set of controls to be used and sup ports the fully automatic system alignment feature Genelec Au toCal Use the tone control switches on the loudspeaker only if a GLM is not available for for calibrating the system The controls are labelled TREBLE TILT BASS TILT BASS ROLL OFF and DESKTOP The factory settings for these con trols are all OFF to give a flat anechoic respons
16. rce device has a digital level monitor pot or graphical volume fader that controls the digital level it may be advantageous to lower the level control either on the GLM soft ware interface or the loudspeaker s back panel controls rather than the source device which in turn will force the use of more of the digital bit resolution in the volume control If the digital input is used audio levels are referenced to 0 dBFS digital Full Scale the largest level that may be represented in the AES EBU signal Genelec DSP loudspeakers produce 100 dB SPL at 1 meter in free space for a digital input signal of 30 dB FS It is advantageous to keep the digital level as high as possible DIGITAL THRU AES EBU Connector This male XLR carries an unaltered copy of the digital signal fed into the DIGITAL IN AES EBU connector It can be used for daisy chaining up to four loudspeakers together GENELEC ANALOG IN Connector Use this connector for analog audio signals When operating an 1238CF in the analog mode the A D converter must not be over loaded otherwise distortion will be heard The maximum input level is 22 0 dBu RMS When A D converter input clip occurs the front panel light turns momentarily red indicating the over load condition If the Level control on the back panel is reduced turned counter clockwise the acoustic output will be reduced This control decreases the output from the D A converters Idea
17. ts the audio channel s available on the AES EBU ca ble to be reproduced by the loudspeaker Turning both switches on reproduces the sum of the two channels on the AES EBU cable Turning both switches off has the same effect which has been done deliberately to avoid the situation where no input channel is selected and the loudspeaker is effectively muted When two channels are selected 6 dB of attenuation is automati cally applied to avoid overloading the loudspeaker If the AES EBU cable is operated in dual wire mode typically 192 kHz sampling frequency one AES EBU cable carries only one audio channel The loudspeaker detects this situation auto matically and the channel selection switches have no effect Driver Mute These two switches allow you to mute the treble and midrange drivers marking DCW or bass driver marking WF indepen dently This may be useful to diagnose if a transducer is faulty System Lvl These switches allow scaling down of the loudspeaker output The signal sent to the Thru output connector is not affected The switches are additive for example 30 dB attenuation is GENELEC achieved by turning on the 10 dB and 20 dB switches The effect of these switches is combined with the effect of the rotary level adjustment control This results in total possible attenuation of 42 dB 30 dB by the system level switches and another 12 dB by the rotary control Using 7000 Series A
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