Then the voltage drop will be a little less. You'll have 23K in parallel with 10K = 6.97K. 47ohm ouput impedance, and you have 47/6970+47 = 0.67% voltage drop.Thanks!
The DAC I plan to pair with it is the SMSL SU-1, which lists a 47 ohm output impedance. So it should be even more favorable than the numbers you list here. (If I'm following your math correctly, a 1% voltage reduction with two amps instead of the 0.5% voltage reduction it would be with one amp.)
What if the second amp has a much higher input impedance? (I believe my other amp is 23 kOhm)
Bottom line : as long as input impedance (combined if driving more than one device) is at least 10x the output impedance of the source, you'll have less than 1dB voltage drop - and that is fine. Just turn the volume up 1dB if you think it matters.
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