Will this set up work? biamping with different amps and subs

Paul,

According to the Audio's 42nd Annual Equipment Directory, the Gershman SW-1s have a sensitivity rating of 87 dB/watt, and I didn't see any specs on the crossover, although judging from the low frequency range of the intended Gershman satellites (to 40 Hz) the crossover may be set low enough for you to use as-is and let your main speakers roll off naturally. I would contact Gershman for information on the crossover point. The difference in sensitivity, however, may force you to use the EVS attenuators to turn down the main speakers (which appear to be more efficient), rather than the subs -- so you may in effect be adding a passive preamp in line with your main speakers, to make this mating work. Also, depending on the crossover point of the sub's internal crossover (if any) you may need to remove the crossover (if it's set too low) and get an adjustable external crossover to obtain optimum results. It sounds like you might be in for a little experimenting. Good luck.

Paul--

I forgot to mention that the difference in the input sensitivities of the two respective amplifiers will also factor into the relative volume levels of the satellites versus the mains. Who knows, if the difference works in your favor, you might not need the attenuators at all -- however, the odds of that occurring would be akin to hitting the lottery.

Sean makes good points except that attenuating the signal at the input of the SET amp will not reduce the available power. It will still deliver exactly the same power to the speakers, although you may have to set the master volume control on the main preamp to a higher position to attain the same dB level. As I said before, this should let you match the level of the more efficient mains to the less efficient subs at the expense of putting a passive preamp and another pair of interconnects in the signal path.