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 Zone 2 speakers power, impedance?
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Posted - 09/06/2015 :  3:56:27 PM  Show Profile  Reply with Quote
I would love some review and help please with a simple 2-zone home audio I tried to setup, but sounds horrible. Running a Yamaha RX-V673 receiver, and the main surround sound TV room zone 1 sounds fine.

Zone 2 is intended to run Kitchen and Dining (Speaker A) and outside deck (Speaker B). From the Yamaha Zone 2 out (RCA style red & white) I run to a Russound x75 Power Amplifier (specs below), running into the Line2 In.

Since it only has A and B and I want to run to 3 pairs of speakers, I used A to attach two runs out (this may be the root of the problem). Each runs to an AudioSource AE100VC volume control knob with impedance set at 2x, through to a pair of PolkAudio Atrium 4 speakers (specs below). Speaker B out runs to a third volume knob and pair of Atrium 4 on the deck.

All three pairs of speakers buzz and sound horrible. Recently my amp burned out, smoked, and I've replaced it.

If you have any advice, for an obvious novice, please offer it up. THank you,

Russound x75 specs:
Continuous output power: 60W per channel at 8ohms, 75W per channel at 4ohms.
Minimum impedance 4ohm in stereo mode (8ohm in bridged). I'm in Stereo.

PolkAudio Atrium 4 specs:
Recommended power 10-80W continuous
Impedance compatible w/ 8ohm.


3749 Posts

Posted - 09/12/2015 :  4:57:51 PM  Show Profile  Reply with Quote
I have had good luck with those impedence-matching selector switches. Give one a shot.

It does sound like your amp could not handle the reduced impedence that comes when one hooks up multiple speakers to a single run (parallel wired). Two normal 8ohm speakers, in parallel, become 4 ohms. Many amps cannot handle that. Some can, however, so you may consider such an amp. The amps in our church can handle loads as low as 2 ohms. Theoretically, this would be good for four speakers, but we limit it to three.
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