Biamping with a cd player

George,

And yes the amps are the same.
Actually consecutive serial numbers.

consecutive serial numbers.

That’s good, they "should" be identical gains, let us know how you went.
They have input level controls anyway, so if the mids/highs or the bass seems louder you can trim it back

Just remember the carpenters saying, "measure twice, cut once"
Same goes for wiring up something like this "double check before turning on"

Cheers George

An oscilloscope (even a very modest one) and a test tone CD or LP or function generator set to sine wave output at a few frequencies across the audio spectrum will help you get the same signal levels to your speaker terminals. 

An oscilloscope (even a very modest one) and a test tone CD or LP or function generator set to sine wave output at a few frequencies across the audio spectrum will help you get the same signal levels to your speaker terminals.

"If" the amps are not identical gains, no need to go to that trouble, just a multiple test tones cd, and you can measure at the speaker terminals using a simple digital ac volt meter to get identical volts into both mid/high and bass terminals.

Cheers George