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On Dec 1, 8:07 am, Cyberserf wrote:
IIRC, Impedance should be equal or greater if you're going to drive
the system. Presumably an 8 ohm 7.1 system will be wanting at least
that much per channel...you can always add a 4 ohm resistor to each 4
ohm speaker to match the requisite resistance

While that MIGHT make the amplifier happy,
it's pretty much a bad idea for several reasons,
among them:

1. Assuming nominal 4-ohm impedance, you're
essentially doubling the amount of power dissipated
as pure heat: it's a waste of power.

2. Along with the above, you're looking at a substantial
reduction in system sensitivity and efficiency,

3. Your already non-flat response is now going to get
worse because the fact that you've now connected
a frequency-dependent attenuator due to the
frequency-dependent impedance variations of the speaker.

4. And how big a resistor do you think you might
need? Assume a measely 50 watts per channel,
25 watt resistors would be the absolute minimum
recommended. These are easily available, where?

...or double the number of speakers
(chain them) on each channel...

It's called "series connection" and, if the speakers
are identical, is a FAR better solution than your resistor
proposal.

assuming you buy two new 8 ohms, you'll need 5 more
4 ohm speakers and one more 4 ohm sub to
double up...uhm...I think that'll make you a 12.2 system

Uhm, no it won't.