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7   

2.0

 

PS   230   
   

2.1   Overview   

   

   

The PS 230 is a 3-rail linear power supply capable of powering two LCPQ 4040 units, 
housed in a robust enclosure. 

 

The unit provides ±28V DC for the audio circuit and +24V DC for the relay bypass 
system and the bypass indicator (LED). In order to cut the cost (and for the shake of 
simplicity), a lot of audio euquipment use a common power rail for the audio circuit 
and  for  other  functions  such  as  relays,  LEDs,  lamps,  etc.  However,  it  is  a  better 
practice to use a dedicated power rail for all non-audio circuits. Therefore, the PS 230 
has an addi24V 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 design  

 

Switchable 115V/ 230V AC 

 

Capable of powering two LCPQ 4040 units 

 

Separate power rails for the audio signal and the relay bypass system 

 

LED indicators for each power rail at the front of the unit 

 

High quality 6-pin Neutrik connectors 

 

Hand-built and hand-wired 

 

3-year limited warranty 

 

 

 

 

 

 

 

 

 

 

 

 

Summary of Contents for LCPQ 4040

Page 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 ...

Page 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 ...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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 ...

Page 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...

Page 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...

Page 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...

Page 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...

Page 13: ... 13 5 3 Block Diagram ...

Page 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 ...

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

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