using different amps for Bi-amping ,any good ?? l

Biamping sounds like it would be a great idea, especially active biamping, which cuts the IM distortion of the speaker's crossover out of the system. However in my small experience (listening to Linn systems) it is not always the best choice. To my ear, two LK85 amps in a passive setup with Keilidhs did not offer a lot over a single LK140. I conclude that as a general rule, one great amp will make two ordinary amps sound dull. I would put the money towards better stereo amplification first.

IMHO biwiring is for when you have already got an amp that makes you very happy indeed, and you want even more of the same.

Hi Simon, I have heard biamped setups that did not have the problems you describe. In particular I would not expect less coherence across the midrange ; rather the contrary.

I think biamping is definitely worth considering. My very humble opinion though, is that it is not worth considering as a priority until you have reached a very high level of performance with conventional amplification. I feel you can do more for less money at an early stage by simply upgrading a two-channel amp. Since biamping means doubling the cost of your amp, consider it this way : how much better a power amp could I get for twice the retail price of my present amp?

I have also heard biamped setups using dissimilar amplification--solid state on the bass and tubes for the treble--so I know it can be done. The guys had worked for months and months on the sound, tweaking crossovers, reworking the amp designs... if you are ready for this kind of fun, that's great.

I think passive biamping with dissimilar amps has enormous potential for disaster.

Biwiring works well on some speakers, and by reports it does not work well for others. My own experience includes the AR2ax and the Meadowlark Shearwater Hot Rod.

The AR model was introduced long before biwiring became popular, so it is a safe bet that its crossover was not specifically designed with biwiring in mind. Nevertheless it sounded better to me when biwired. Highs became clearer and bass did not suffer.

The Meadowlark Shearwater's crossover was designed for biwiring. The manufacturer recommends you run it that way and that's how it sounds best to me.

Other people have had negative experiences with biwiring; try searching the archives here and at Audio Asylum. I guess you just have to try it with your speakers and amp.