Originally Posted by etc6849
It's true that most AVRs can't keep up with the impedance swings of woofers
Several myths in one short statement:
(1) There are many cases where the worst swings in impedance curves are not due to woofers.
Consider this speaker whose worst impedance swings are above 10 KHz:
(2) That AVRs can't handle them is a myth.
and do have under powered power supplies driving multiple amps,
What reliable evidence is there that AVR power supplies are underpowered for the purpose of driving speakers with music or drama?
but if you have a well treated room with a sub (best to have dual matching subs), you can set the cross-over high in the AVR to take load off the AVR's amp and get great sound.
Yet another myth. It is true that a subwoofer takes a signficiant load off of both the LCR speakers and by implication the AVR. I know of no instances where people are setting crossover frequencies excessively high because the AVR can't handle the speaker load. I'm surely not doing that!
I wouldn't expect a $500-700 AVR to provide "audiophile" quality, but if you invest your money in highly efficient speakers and dual subs you probably can get a very nice sounding system.
Audiophile quality is a myth. Even just mid-priced AVRs use many of the same ICs, resistors, capacitors, power transistors, and DACs as are found in separates.