gerrygr said:
I have a powered sub that's connected to the sub out.
Maybe my issue is total speakers. I run a 5.1, with mains at 6 ohm, center at 8 ohm, and rear surrounds at 8 from speaker terminals A. From speaker terminals B, I run a Sima speaker selector, where I connect 2 more sets of speakers 8 ohms - 50 W max.
My Yamaha has been sproradically cutting out on R & L channels. However, the rear surrounds always work. Thus, I'm looking to take the load off the mains.
It could also be that I need to clean out the inside of the heatsinks and reapply thermal grease.
Or buy a new receiver....
It sounds like you need to disconnect everything from your B terminals; you are very likely presenting the main channels of the Yamaha receiver with far too low of an impedance (however, we would need to know more about how your Yamaha connects the A and B together, and we would need to know what is going on inside your Sima speaker selector). If you must run that many speakers, you could try using a separate amplifier connected to your tape output, though you would then need to control that with its own volume control. If you must have all of those speakers going at once, and if you must control them all with one volume control, you could get a new receiver with preamp outputs, and hook up a separate amplifier for the extra speakers. Or, you could just use that Audiosource amplifier that you mention that can handle high level inputs, hook it up to the B terminals, and drive the extra speakers with it (or use high level to RCA adaptors with a different amplifier). Most likely, the way the high level input works is that, for each channel, a resister with a value in the neighborhood of 50k ohms is used to drop the level down to an appropriate level for the amplifier's input. If that is how it is done, then this should have an insignificant effect on the impedance presented to your Yamaha receiver, and should work okay. But before you buy, find out what impedance is presented to your Yamaha by the Audiosource amp (or high level to RCA adaptor) to make sure all will be okay.
Another option, depending on what your Sima selector does, is to connect all of your main speakers to the Sima selector (if it can deal with 3 pairs of speakers, and if it is wired to keep the impedance high enough for your amplifier, which it may or may not be), and connect it to the A terminals, and do not use the B terminals of your receiver. Before trying this, find out what your Sima does. If it simply hooks everything up in parallel, do not do this; try one of the suggestions above.
