VANDERSTEEN 3 A SPEAKERS

The Vandy speakers manual actually talked about how to bi-amp. I don't see how the sound can be worse if amps are identical. Easy to achieve with solid state, not so easy w/ tube amp w/o auto-biased circuit.

Trying different amps however will cause possible issues with gain matching.

In any case, what specific amps are you thinking about bi-amping with would be the better questions?

I wonder why the oscillation occurs with only solid state amp. Sounds like a strange interaction btw Vandy's 1st order cross over hi-freq load and solid state amp.

Perhpas when both hi-freq and low-freq are connected to the same amp, there are some compensating effects from the cross-over interaction.

Tube amp probably is more stable due to transformer at the tube amp's output stage.