XLR to RCA with attenuation pad.

[KOL69]

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

[BWRX]

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.