Input sensitivities might be a little off so maybe as you turn up the volume one amp may give more power compared to the other
Buy a test tone CD and a sound level meter
Those old simpson sound level meters are good and cheap these days.
Good luck
Bi-Amping: How can I determine relative output?
Long Story Short: I have a 50w/channel pair of tube monos, and a 300w stereo solid state amp playing through a set of JBL 4367s. two way monitors.
The tubes are on the horn tweeter and the solid state is on the 15" woofer, crossover is apparently 700hz.
Doing absolutely nothing, some music sounds completely "normal" and some music sounds artificially bass heavy.
The solid state amp has gain adjustments for each channel.
I have a Fluke 115 multimeter, and access to plenty of test tones, but nothing to read SPL.
Is there a way to measure output at the speaker terminals such that I could dial the woofer amp down to "match" the tube amps?
If so, would this be more or less constant as the preamp driving the amps changes volume, or would it only "match" (to the extent that it actually matches at all) at one volume level?