Help with bi-amping

I find this thread interesting because Martin Logan has quite a bit of information claiming that the benifits of an active crossover are far more than outweighed by the negative aspects of adding another component into the signal path. It is also interesting that they incorporate a crossover in their Statement speaker system that is also available for the CLS2z's.

pmwoodward - Could you provide a link to the information from Martin Logan? All I could find on their web site was the following paragraph under the ESL Tech technology brief.

"Common low and high pass filter crossovers and the inherent problem of crossing over at higher frequencies produce phase shift and amplitude fluctuation problems when the music signal is recombined. This is because high frequency signals have shorter wavelengths, and changing the distance from the sound source to the ear can present a 180 degree phase shift, and this translates as silence to the human ear".

First, I believe that this statement refers to passive crossovers, not active crossovers. As you noted they do state that they incorporate a crossover in their ESL speakers. One way or the other the thrust of what I saw on their web site seemed to be that no crossover was better than a crossover, not that a passive crossover is better than an active crossover.

That's probably true, but I don't know enough about their technology to comment one way or another. Since we are discussing bi-amping and you can't bi-amp without a crossover of some sort, passive or active, I don't think it applies to this particular discussion thread.

Regards,
Greg

I have an idea. I want to run my SET amp onto a pair of 96 db, full range speakers which I hand built and because it is bass shy, also want to connect my SONIC FRONTIERS POWER 2 to a pair of SW-1, GERSHMAN subs. The input to both amp will have to use the two amp outputs in my SF-Line 2 preamp. To modulate the volume of the bass section amp, I am thinking about getting a pair of the EVS attenuators.
What I am wondering is if this will sound good or will the integration of the lower and high frequency be choppy sounding. The preamp and both amps will be trying to run both of speakers/subwoofers to their lowest to their highest frequency according to the music. The subwoofer has its own built in crossover, but I wonder what is its cutoff point. Will I be more successful adding a crossover to the subwoofer section? Then if I do this, what can I do about the frequency of the full range speakers? Any feedbacks will be greatly appreciated!

PAUL