Would a stereo Sim Audio Moon 861 amp be as powerful as 2 McIntosh 611 monoblock amps?

@yyzsantabarbara 

Thanks for your response. A disappointing audition of the Mojo Mystique XSE has challenged my previous conviction that a warm sounding  DAC would be the right fit for me. In the past, I’ve noted your enthusiasm for Schiit DACs so I thought I’d ask you about the Byggi. I will research sound signature of the OG.

I was asking in this thread because I own a Yamaha AS 3200.  I played at 70% volume to get about 70 DB. After 70% it starts losing its sound quality really bad and sounds thin. I want to make sure my next smp has plenty of headroom

That really indicates something else is wrong. Not raw power. Your speakers should be pulling a fraction of a Watt to produce SPL's under 80 dB.

Volume controls are never linear, so 70% on the dial (or 70% of its max numeric value if digital volume) would be much less than 70% of full power. That said, if you have to go 70% to hit 70dB, then your system could be lacking the necessary gain to tap the amps' power reserves. Many modern systems are on the other side, having more gain than they need. A poorly matched cartidge & phono stage is the most likely culrprit for a gain-starved system.

Or you could be fine on gain, and you just don't like the Yamaha amp (or something is wrong with it), or the speakers, or the match of amp to speakers. If you're at volume 70 and the full range is 1-100, and each digit represents 1dB, then 70 is actually 30dB down from "full gain", which means 1/1000th (or 0.001 = 0.1%). 

I’m using a pair of Sopra 2 speakers.  When I purchased them I was using a Simaudio 700i amp. It sounded great, smooth and detailed.  I switched to a McIntosh MA9500 that had a lot more power. 300wpc I believe. It has a totally different sound that I liked better. I usually listen at 85db avg. and the Mac rarely hits 30watts. At those levels the 700i sounded a bit strained. With these speakers I think the Mac is a better match, especially in the Bass. 

I agree with @mulveling , sounds more like a gain issue than a power issue. Many times the two are conflated.