XLR to RCA with attenuation pad. - diyAudio
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Old 22nd April 2008, 04:24 AM   #1
KOL69 is offline KOL69  Norway
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Join Date: Sep 2007
Question XLR to RCA with attenuation pad.

Problem:

I'm using LynxTWO-B soudcard connected directly to a poweramp. There is a mismach in singal strenght (yes, I'm using -10dBV and not +4dBV) and I want to make a attenuation pad inside the XLR/RCA adaptor.

The output impedance of the card is 50 Ohm (unbalanced mode), but the manual also say: Output Drive Capability 600 Ohm(?).
The input impedance of the poweramp is 20 kOhm.

Should I make a L-pad (two resistors) or a T-pad (three resistors)?

Anyone out there that know where I can find formulas or information on how to make attenuation pads?

regards
KOL69
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Old 25th April 2008, 12:10 AM   #2
BWRX is offline BWRX  United States
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Location: Pennsylvania
You will need to put a resistor in series with each balanced output (these should be matched well), then you can either put a resistor (or potentiometer) across the balanced lines or a resistor from each output to ground to attenuate the signal.
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