While you're waiting for a reply from Jim, I'll throw in my 2 cents.
Using two stereo amplifiers for bi-amping, if they're not identical amplifiers then at least one of them will most likely need gain adjustment controls to match the amplifier gain to each set of speaker inputs so that the balance between the bass and mid/treble driver output is maintained.
Sometimes an amplifier that has superior midrange and treble qualities, such as a tube amp, is used to power the mid/treble while a more powerful solid state amp is used for the bass.
In your case, I don't think either amplifier has gain controls, and if they did I doubt you would hear any improvement unless you felt that the Krell had audibly better midrange and treble sound than the Wyred.
Besides matching the gain between amplifiers, you would have to split each channel's preamp output to feed the input of both amplifiers. If the preamp has only one set of outputs you would have to use a Y-splitter on each output which is not always the best method because the preamp outputs see an amplifier input impedance of the two amplifiers combined in parallel and in some cases there can even be undesirable interaction - versus a preamp that has dual buffered (isolated) outputs.
In the end, even when the amplifiers are properly matched and fed a proper signal, the benefits from passive bi-amping are usually quite a bit less than active bi-amping with an electronic crossover (and bypassing the speaker's internal passive crossover).
I think I would find another home for the Krell and put some cash in your pocket.
Steve
