I have a Sony HT-CT150 that no longer outputs sounds.
I want to make sure that the system is actually outputting sound, before I start ripping speaker wire out of my wall.
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You should be able to check the connections from your amplifier to your speakers by using the resistance function on your multimeter to measure the resistance through the speaker wire and the speakers. It should be close to zero (mine was about five ohms). Anything very high indicates an open circuit and likely a disconnected wire somewhere.
This doesn't rule out a short between the wires though. To check that, you can take a AA or AAA battery and momentarily connect it to the speaker wire. If everything is connect right, you should get a pop or static noise at the speaker.