Then other extreme (and I see this in Infinty designs, among others), is a crossover design that, due to the attempt to "force" drivers to do things they don't want to do, winds up with DRASTICALLY varying impedance... the crossover is "forcing" the amp to put out more power at a certain frequency, in order to "fill in" a response hole that would otherwise result. Some examples of this are high-Q low-pass and high-pass filters... they actually resonate themselves, and result in greater power transfer to the driver, at a frequency, than the driver actually would have connected directly to an amp. It's almost like a frequency-dependent transformer, of sorts. This is to be considered cheating, IMHO... the REAL solution is to pick drivers that INHERENTLY MATCH better, so you don't have to play these amp-sapping (and sometimes amp-blowing) games...
Regards,
Gordon.
