Here is Dan's response to me on AV123....

Dear Randy,
I know that Lonnie has explained the situation to you with respect to amplifier protection thresholds into 4 ohm loads. I would like to reiterate for all MPS-1 owners, if I may.

Let me be perfectly clear; the amplifier will not inhibit into 3-4 ohm loads unless the soft limiter is sensing significant levels of distortion. It doesn't shut the amplifier down "for no good reason". If you are driving your amplifier into a four ohm load and it inhibits, it is because the soft limiter has been driven to the point it sees you have exceed a preset output volt/amp threshold that we have set. Under these circumstances, the amplifier is being driven into pretty hard clip. You don't hear it as such because the soft limiter is doing its job. It is reducing the hard edge clipped waveform into something more benign. But, when you listen to the amplifier under this condition, you can clearly hear the change as the amplifier sound appears to soften and dynamics are affected. This is intentional and was designed to keep you and your speakers safe and sound. Our goal was to make a better product; for some people, this is seen as a negative attribute. One reviewer thought the amplifier didn't make enough power; we explained to him our thinking behind the limiter and he didn't get it. He felt is made the amplifier seem less potent than it really is. Our desire to build a cool feature into the amp may have backfired on us with some people. I guess you can't please everyone!

To address your comments about SPL's measurements and your displeasure over only being able to reach SPL's in the low 100+dB range at 12 feet in your room, as measured by your RS meter; this is not a scientific method of determining real power output. The RS meter is not a peak reading meter and its VU metering ballistics are suspect. Your measurements are low by at least 6-10dB. Also, at 100+ dB the microphone in the in the meter is compressing which adds to measurement errors. The problems with this test methodology go on and on.

Also, hanging a DVM across the speakers while playing music is not going to provide meaningful data either. I don't want to go into a long technical dissertation as to the problems with this measurement technique, but please trust me, your approach is not correct.

We have given you a solution for the address your unhappiness with the protect threshold which involves removing the soft limiter. This will make the MPS-1 behave exactly like the IPS-1 and and LPA-1 amplifiers.
It will not make the amplifier bad or dangerous to your speakers. It will will make the amplifier behave like 99%of all other all other amps on the market. You will only have hard clipping present on the amplifier output when you push it beyond its power ratings. You may find that you hear the sounds of distress more readily this way as the soft limiter will not cover up this over load condition. At then end of the day, it is up to the judgment of the listener to exercise common sense when we hears obvious signs of distress in his system.

In any event, it will eliminate you major complaint. The unit will still be under warranty, all normal protect functions are still in place, and if you are not happy, we will return your module to its original state for you free of charge.

I suggest you try it on your main left and right modules and see what you think! You may be very pleased with the outcome; and you have nothing to lose!

I hope this helps clarify our recommendations and the thinking behind our decisions. Please let us know if this addresses your problem. I'm sure many other people would like to hear your feedback on this issue. As always, feel free to contact us with any other questions or issues you may have.

Thanks for your support.
Best regards,
Dan
__________________
Dan Laufman
President
Emotiva Audio Coporation

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