I used RMAA to do some basic testing.
Testing setup : PC sound card -> Amp line in -> Amp speaker out -> 4 ohm load -> Passive Preamp -> mixer preamp -> PC sound card in.
Passive preamp is to lower to amp's output voltage to line level, mixer preamp is to convert the balanced signal to non-balanced for sound card input.
RMAA test result for 1W, 10W, 100W, and 294W at 4ohm load:
Click the below links for the detailed test graphs :
- Frequency response
- Dynamic range
- THD
- IMD + Noise
- IMD + N (swept freq)
My sound card's loop back THD is about 0.0017%, so the BPA300 THD result here may be limited by the sound card.
