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buying a pair of Polk SDA 2A speakers that require amp with common ground

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Jim Pittsburgh:
THe SDA 2A speakers require an amp with a common ground... does anyone know if a HT receiver uses a common ground?
I am using a Sony STR SH520 for the garage system.... I do not believe that HT receivers use a common ground?  is there anyway to make this work?

Jim Pittsburgh:
 I have the repair manual now for the Sony STR dh520   http://elektrotanya.com/sony_str-dh520.pdf/download.html
 if someone can read them better than I can I'd appreciate it or  I'd be happy to email them, if you could please take a look. It was suggested that jumping the main speakers negative terminals would work? I'm dubious and don't want to destroy either the receiver or the speakers help? thoughts?

SunnyDaze:
Look on page 17 of the service manual.

On the right hand side of the page is the schematic for the audio signal output (to loudspeakers) section.

Observe that all speaker grounds are tied to the common chassis and are not isolated from one another.

You're good to go.

Slim-Shaddy:
Pulled from the Polk forum...
Test it with an ohmmeter. < 1 ohm between negative terminals of opposite channels = good.

SunnyDaze:
According to this schematic, you should have an open signal between negative terminals.

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