Awesome that the bi-amping helped a bit. Are you running the M80's full range?

Earlier in the thread you said.

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Even when I walked up to about 3 ft of either m80, was not even hitting 110dB's, at least what I could see visually with the SPL meter.

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This is from today and the bi amping trial. So what exacty changed?

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When the woofer section shut down, I was not going over 110dB from 3ft in front of the speaker.

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Well John, the reason that the amp driving the mids/highs didn't shut down is likely the result of two factors: the impedance of the M80s in those frequencies varies from about 4-15 ohms, with an average of about 8-9, so that made things easier; in addition, it's likely that the highest power demand on that particular material occurred in the bass range, so that amp had to handle very little of it.

As to the bass section amp, no, there isn't any difference in the impedance it faced(and current required)before and after; from the published graph it's very close to the nominal 4 ohms, and nothing's been changed, since the bass drivers are of course the same and the crossover circuitry hasn't been changed either.

As to the observed higher setting before shutdown in the bass, there shouldn't be any significant difference if the conditions were identical, since no additional power capacity has been added. The temperature and/or current limiting circuit should shut it off at about the same setting. Possibly there had been longer operation and the temperature was higher when it had shut down at +4 on the previous occasion.

Thanks Peter, now that you ask that question. In previous tests I had the 80's set to small, with a crossover of 80hz. So the MPS1 amps weren't even getting the entire low freq's.

Today, I actually set the 80's to large, with No Sub turned on. The bass was very nice and tight and full of punch, that is until it shut down.

This would solve your problem. They used to make a 2ch version that was like 600x2 at 8 ohms.

>>In previous tests I had the 80's set to small, with a crossover of 80hz. So the MPS1 amps weren't even getting the entire low freq's. Today, I actually set the 80's to large, with No Sub turned on.

Auggh !!

What happens if you run with the mains set to Small ? Would that be more of an apples-to-apples comparison ?

There's no smiley for this, but imagine me asking the next question through clenched teeth. IS THERE ANY CHANCE THAT THE BETTER SOUND AND TIGHTER BASS MIGHT HAVE SOMETHING TO DO WITH THE DIFFERENT CROSSOVER SETUP AND NOT THE BI-AMPING ?

This will do the trick. huh Rick

I bet it would

I wonder if their warranties are transferable, this one is on Audiogon?

No they are not.