Originally Posted by Paradox me
Today I was given a Sony STR-DG500
for free, and while I'm sure it isn't the best receiver out there, I figured I could at least use it until I've saved up enough money for a new one.
Problem is, it's rated at 8 ohms and for the past year or so it's been used with some cheap 4 ohm HTiB speakers. I understand that this isn't necessarily good, as it can damage both the speakers and the receiver.
I'm assuming that it'd be a bad idea to hook up my Polk Monitor 40s to this thing now? I'd hate to damage the new speakers as a result of damage previously done to the receiver.
If your receiver has an A / B speaker selectorswitch and does not mute the audio when you select both but only have one pair of speakers connected, than the connections are wired in parallel
Z1*Z2 / (Z1 Z2)
^forget about this. 8ohms speakers for parallel
If the sound goes off when you select A and B speaker outputs but only have one set of speakers connected, then the Receiver is wired in series.
Z1 (plus) Z2 - Somehow the addition sign don't wanna show on here
Get a speaker switch box from Niles they do clever circuit impedance tricks to ensure a safe load in maintained to your receiver with multiple speakers connected simultaneously. They go around for $100-200. Some place you can get them for lessEdited by Spooony - 6/6/11 at 8:01pm