Question about Onkyo TX-SR505 Receiver
If you have an ohmmeter, you can verify the house wiring. Disconnect all the speakers from the amplifier. Disconnect the speaker wires from the speakers. Make sure none of the ends touch.
Connect the ohmmeter across each set of speaker wires. You should read an open circuit across each set of speaker wires. Basically if the meter gives you any reading, there is a fault somewhere on the line.
You could do the same test with the speaker wires connected to the speakers (but still not connected to the amplifier). You should see a reading greater than 4 ohms (and most likely less than 8 ohms) on each set of speaker wires. If you see a reading of 0 or 1 ohm on one set of wires, consider this suspect.
You mentioned earlier that you had 3 rear speakers each of 8 ohms... are they connected to one set of speaker wires at the amp? This would be an equivalent impedance of 2.7 ohms, and with loud volume, might be overheating a set of amp chips causing it to go into protect mode.
Let me know what you find.
Posted on Mar 25, 2008
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