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From Albert Von Schweikert:3. The "secret" to achieve "killer" sound quality is to ensure that the amplifiers have exactly the same input sensitivity. The amplifier with the lowest numerical rating, i.e. 100mV is much more sensitive than an amplifier with a rating of 500mV - the higher the number, the lower the sensitivity. You'll need to reduce the higher sensitivity by using a series input resistor. This can be installed inside your amplifier, directly at the RCA female jack leading to the input stage. If this sounds a little scary, then build an adaptor to house the resistor outside the amp. If you contact Michael Percy at www.percyaudio.com, he will advise you on what you'll need to get from him. Usually, a female RCA jack, a male RCA plug, a high quality metal film resistor, some plastic sleeving, and a short piece of high quality hookup wire is all that is required. Basically, you're inserting the resistor between the "hot" connection from the female RCA jack to the male RCA plug, and then using hookup wire to connect the ground leads. The entire assembly can be only a few inches long and installed into a plastic or Teflon sleeve to prevent short circuits. This adaptor is inserted into the signal path between your preamp and the most sensitive amplifier. As you can infer from this description, the adaptor is used in between your interconnect and the input jack of the amplifier.Michael Percy sells these parts for less than $100 for everything you'll need, and he'll also help you select the proper value of resistor to match the sensitivities. Although this simple technique may sound like a "Micky Mouse" setup to "sophisticated" engineers that design chip OP AMPS and sell electronic crossovers to the PA industry, it is a very "pure" form of passive matching that will stomp the crap out of any electronic crossover I have ever tried.
Once you have the capability to fine tune the level of the bass amp relative to the mid/treble amp, you really come to appreciate the control.
A note re: the solid state amp -- the Emotiva was a bit mushy, so I ended up going w/ a Wyred4Sound amp instead. I also have a really nice Parasound power amp which I've been quite happy w/ at my office running full range (i.e., not part of a bi-amp setup). I briefly tried it at home in place of the Wyred4Sound, and didn't care for it at all. In fact, I tried it on two separate occasions, because "on paper" it seemed to me that the Parasound was the better unit. Point being, do not assume all solid state amps are created equal (despite having similar or identical power ratings).
If you do you may consider using a passive preamp or volume control for bass amp. charles
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