The only detailed bench test review of the Monolith I have seen is Gene's.
The Monoprice Monolith is an astounding 7-channel, 200wpc amplifier with two massive teroidal transformers delivering gobs of power and textbook performance at a value price point. Our amp of the year
www.audioholics.com
The stats he reported are excellent. Since then Monoprice added balanced connectors. I also like that they offer a 30 day money back guarantee from delivery and a 5 year replacement warranty. The 7x200 is a value play at $271 per channel with tax and delivery. Even less if your state is state tax free.
Supposedly these amps are built at ATI facilities. The ATI version is almost twice as much so hard to know what differences are in play. However, both models have the same 93lb weight.
Compare the ATI AT4000 specs to the Monolith specs. Amazingly close. The design of the chassis top, overall size, damping factor all the same. It's hard to find a spec between the ATI AT4007 and the Monolith 7X that are not listed as the same. But the speaker terminals on the AT4007 are gold (higher quality) so there will be some difference. It would be interesting to see these two amps in an AB test.
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ATI AT4007 Signature Series 7 channel 200 watts/channel audio power amp from Amplifier Technologies Inc.
www.wwsp.com
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