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

SPL wise, surely either amplifier will get you to 85 dB SPL for most listening positions in most rooms.

I do not guess which Dynaudio model you are after, but I see the Confidence 50s are specified as 4 Ohm speakers, with drops to 2.7 Ohms. Mc 611s, with 2, 4, and 8 Ohm outputs, would offer you options to explore how the different taps, with their graded maximum current capacities, match the speakers.

YMMV, but I'd prefer to have the flexibility. Experiment.

As others have said, either will deliver far more power than you will need. I'm familiar with those amps and they will likely have very different sounds. The Sim will be very detailed, transparent and analytical-although I enjoy the Sim sound, too dry for some tastes. The Mac will sound like a Mac, softer, less detail than the Sim.

If you are really concerned about power, you might consider the Michi S5. More power than you would ever need and built to last. I just replaced one in my system and tried the Sim North 761 when I was looking. In my system, to my ears-we all hear differently-the Michi had a better sound-the same level of detail, but a bit more natural. At about half the price.

@dman777 I don’t think anything is crazy. Many folks like to use tube preamps. I had the McIntosh C2600 and thought it was wonderful. 

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

@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.