Get an Ohmmeter, take a reading on each speaker line one at a time, on both A & B speaker lines. You should get a reading of 8+/- ohms. The speaker switch with the 6 spks will probably read almost 0 ohms when all 6 are running. That is what your amp is not liking. Try running it with one set of speakers on the switch,with the Tannoys on ch A on your amp and the switch on B. add one pair of the 6 at a time and you'll see that it won't like all 6 at once. 2, maybe 4, at a time is probably what you'll find to work.
Good Luck.
before you buy the meter, disconnect all speakers from the amp(including the switch). With no speakers connected, play a CD, turn the amp volume to 50% and see if the problem shows up again. If it does, take it back and ask the store to do the same test. If they will let you, get another brand or model amp. If they will only exchange for the same model, insist they 'burn test' it for a few days.
Is the problem does not re-occur with no speaker load, check each line with it not connected to the amp or switch, just the speaker. this is where the multi-meter will come in. You should be able to get for $10+/-. let me know what you find.
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I will buy the unit and try, thank you. For reference, I tried putting the main speakers through the unit too and had the same problem. My understanding is these units are supposed to have impedance protection and it should not cause a problem. I also tried individual speakers to my ampl... same problem, and just the speaker switch to the amp... same problem. What I don't know, however, is if perhaps the amp is now somehow "damaged" and that anything I do will be the same. I will buy the meter and try.
For my reference, you say I simply test each wire and it will give me an ohm reading? So this will help diagnose if I have an issue. Do I test this with the wires active and the speakers working or turned off or....?
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