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LCPQ   4040   
   

1.1   Overview   

   

   

The  LCPQ  4040  is  a  transformer  balanced,  high  performance  all-discrete  equalizer 
with four passive RLC sections in cascade configuration. 

 

Each band has a variable level control ranging from -12dB to +12dB. The four bands 
of  equalization  offer  selectable  Shelving/  Bell  on  the  first  and  fourth  band  and 
selectable HiQ/ LowQ on the second and third band. 

 

Each  band  can  be  independently  bypassed.  When  an  EQ  band  is  not  engaged,  the 
audio  signal  still  travels  through  the  transformers  and  the  discrete  circuit  but  not 
through the RLC circuit and thus the unit can be used as a high quality unity gain line 
amp. In addition to the individual bypass, the unit employs a true bypass relay system, 
where  the  input  signal  is  connected  directly  to  the  output.  When  the  unit  is  not 
powered (or in situations where the power accidentally goes down), the bypass relay 
system is automatically activated and therefore the signal will not disappear. 

 

The  LCPQ  4040  features  Carnhill  high-level  audio  signal  input  and  output 
transformers  and  a  combination  of  four  Carnhill  and  custom  made  tapped  inductors 
(5% tolerance) that were chosen after extended listening tests and measurements. 

 

The unit consists of Grayhill rotary stepped switches for frequency selection, plastic 
conductive potentiometers (10% tolerance) for boosting/cutting, Wima polypropylene 
(low  tolerance)  film  capacitors  in  the  RLC  path,  Panasonic  audio  grade  electrolytic 
capacitors  in  the  active  circuit  and  Neutrik  connectors  for  the  audio  and  power 
connections. 
 
Each  unit  is  hand-built  and  hand-wired.  All  the  components  are  chosen  and  tested 
thoroughly for best performance, musicality and long-term reliability. 
 

   

1.2   Features   

   

   

 

Fully discrete (transistor) circuit 

 

Transformer (Carnhill) balanced input and output 

 

Carnhill and custom made tapped inductors  

 

Thirty four selectable frequencies  

 

12dB of Gain/ Attenuation per band  

 

Selectable Shelving/ Bell on Band1 and Band4 

 

Selectable HiQ/ LowQ on Band2 and Band3 

 

Individual bypass on each band 

 

True bypass relay system 

 

High quality Neutrik XLR connectors 

 

Low components tolerance for stereo configuration 

 

Hand-built and hand-wired 

 

3-year limited warranty 

Содержание LCPQ 4040

Страница 1: ...LCPQ 4040 Discrete 4 band EQ Operator s Manual Version 1 2 MIAD Audio Aleje Jerozolimskie 137 55 Warsaw 02 304 Poland Email info miad eu Phone 48 882 153 350 ...

Страница 2: ... 3 Front Panel 2 4 Rear Panel 3 0 Troubleshooting 4 0 Specifications 4 1 LCPQ 4040 Technical Specifications 4 2 LCPQ 4040 Dimensions 4 3 PS 230 Technical Specifications 4 4 PS 230 Dimensions 5 0 Appendix 5 1 Warranty Registration 5 2 Product Warranty 5 3 Block Diagram 5 4 Frequency Response 5 5 EQ Response Curves 5 6 Recall Sheet ...

Страница 3: ...e AC plug Protect both the AC power cord to the power supply and the DC cable between the power supply and the EQ unit from being walked on or pinched Use only attachments accessories specified by the manufacturer Unplug this device during lightning storms or when unused for long periods of time Refer all service to qualified personnel WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EX...

Страница 4: ...arnhill high level audio signal input and output transformers and a combination of four Carnhill and custom made tapped inductors 5 tolerance that were chosen after extended listening tests and measurements The unit consists of Grayhill rotary stepped switches for frequency selection plastic conductive potentiometers 10 tolerance for boosting cutting Wima polypropylene low tolerance film capacitor...

Страница 5: ...470Hz Band 2 OFF 180Hz 220Hz 270Hz 330Hz 390Hz 470Hz 560Hz 680Hz 820Hz 1kHz 1 3kHz Band 3 OFF 1 2kHz 1 5kHz 1 8kHz 2 2kHz 2 7kHz 3 3kHz 3 9kHz 4 7kHz 5 6kHz 6 8kHz 8 2kHz Band 4 OFF 3 3kHz 4 7kHz 6 8kHz 10kHz 15kHz 23kHz D LEVEL Each band has a high quality continuously variable potentiometer that controls the amount of gain or attenuation 12dB E HI Q LOW Q SWITCH This switch controls the sharpnes...

Страница 6: ... audio circuit Pin 4 24V relay bypass system and bypass indicator Pin 5 0V reference for 24V Pin 6 0V reference for 28V B 3 PIN AUDIO OUTPUT This is a transformer balanced XLR output with the following pin configuration Pin 1 Ground Pin 2 Hot Pin 3 Cold C 3 PIN AUDIO INPUT This is a transformer balanced XLR input with the following pin configuration Pin 1 Ground Pin 2 Hot Pin 3 Cold D PRINT Contai...

Страница 7: ...ted power rail for all non audio circuits Therefore the PS 230 has an additional 24V DC rail which ensures that no unwanted noise caused by the relays and the bypass indicator is added to the audio signal The PS 230 can be switched for 115V AC or 230V AC operation and the mains fuse is accessible to the user from the rear side of the unit in the IEC inlet 2 2 Features High efficiency low noise des...

Страница 8: ...t while the unit PS 230 is ON Hot plugging i e connecting the DC cable while the unit is powered on may damage your equipment B POWER INDICATION 28V This LED allows visual confirmation of the presence of 28V C POWER INDICATION 28V This LED allows visual confirmation of the presence of 28V D POWER INDICATION 24V This LED allows visual confirmation of the presence of 24V ...

Страница 9: ...it Pin 4 24V relay bypass system and bypass indicator Pin 5 0V reference for 24V Pin 6 0V reference for 28V B PRINT Contains information regarding the serial number and the manufacturing date of the unit C IEC MAINS INLET Including the 115 230V AC switch and fuse Make sure that the AC voltage indicated on the IEC inlet is the same as the mains in your country and that you use the correct fuse An I...

Страница 10: ...Frequency Response 20Hz 20kHz 0 0 3dB THD N Less than 0 01 4dbu 20Hz 22kHz unity gain 22kHz BW Signal to Noise Ratio 92dB unweighted re 4dbu 22kHz BW unity gain Maximum Output Level 21dbu 20Hz 22kHz into 600 Ohms Dynamic Range 113dB re 21dBu 22kHz BW I O Connectors Transformer Balanced XLR 1 Chassis 2 Signal 3 Signal 4 2 LCPQ 4040 Dimensions Unit Shipping Width 482 6mm 19 inch rack Width 550mm Dep...

Страница 11: ...e caused by the user spillages or moisture neglect abuse or misuse including but not limited to the failure to use the MIAD Audio product for its normal purpose in accordance with the manufacturer s instructions for usage failure to properly maintain the MIAD Audio product in accordance with the manufacturer s instructions and or the failure to use the MIAD Audio product in accordance with the man...

Страница 12: ...ent of the original proof of purchase and to transfer that proof of purchase to any subsequent owners of the MIAD Audio product 6 The purchaser is responsible for the shipping costs to and from MIAD Audio MIAD Audio is not responsible for damage resulting from improper packing and or mishandling by a shipper 7 MIAD Audio reserves the right to inspect any products that may be the subject of any war...

Страница 13: ... 13 5 3 Block Diagram ...

Страница 14: ...e curves for each band BAND 1 BAND 2 Top Curve Shelv Max Boost 45Hz 20Hz 40kHz Top Curve Low Q Max Boost 560Hz 20Hz 40kHz Bottom Curve Bell Max Cut 45Hz 20Hz 40kHz Bottom Curve Hi Q Max Cut 560Hz 20Hz 40kHz BAND 3 BAND 4 Top Curve Low Q Max Boost 3 3kHz 20Hz 40kHz Top Curve Shelv Max Boost 6 8kHz 20Hz 40kHz Bottom Curve Hi Q Max Cut 3 3kHz 20Hz 40kHz Bottom Curve Bell Max Cut 6 8kHz 20Hz 40kHz ...

Страница 15: ...___________________________________________________________________________________________ ARTIST _______________________________ PROJECT _______________________________ DATE __________________ TRACK ________________________ INSTRUMENT __________________________ ENGINEER _______________________ NOTES _________________________________________________________________________________________________...

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