Well at least I can now talk about these...
My wife and I were able to hear these in August after our local audio dealer said he would have a pair for a few days. At the time, we had the Momentum Stereo amplifier. We originally bought the Momentum Stereo over the Momentum Monos due to the price differential and the fact we thought the Stereo amp was slightly more to our musical taste. Indeed the original Momentum Monos were more precise/accurate than the Momentum Stereo, but we felt the Stereo was more up our alley.
To make a long story short....After listening to the new Momentum Monos, we immediately knew they (to our ears) were better than our Momentum Stereo hands down, believed they improved over the old Monos, and knew we needed to upgrade. We talked with the local dealer and D'Agostino and used their upgrade policy to upgrade our existing Stereo (needed to purchase a second Mono of course) to a pair of these new Mono versions.
The amps were delivered in early September and for the last month+ we have been burning them in and running them through a ton of music. The bottom line is that we are still thrilled and feel the upgrade was worth every penny.
The two main reasons for us to jump on these immediately (it is rare for us to be that smitten right out of the box) were:
0. The new Monos gave us a magnificent balance of musicality and accuracy. To us it was similar to having a better musical Stereo version with a better accurate original Mono version. It was, to us, the best of both Dan worlds (if that makes sense). For those Pass Labs owners I would use this analogy... The XA amps gave you the pure unadulterated glorious musical presentation as a tradeoff to pure "audiophile" accuracy. Whereas the X-series gave you more bottom-end control, drive, and accuracy as a tradeoff to the pure musicality. The Xs gave you a great balance of both.
With the new Monos, we believe they give a similar balance and bettered the strengths of the old Monos and the strengths of the Stereo version.
2. I realize that the new Monos have more power (400W vs. 300W), but man, to our ears it feels like these amps were super-charged over the old Monos (and of course over our Stereo version). When I was listening to the new Monos originally this is what came to mind immediately. For those who swim.....At the end of a workout if you are pushing hard and/or you are just getting tired you sometimes don't cut through the water with your arms with authority as you are hitting the wall to flip turn or push off and rather have the water build-up help you as you approach the end wall. If you are feeling good, you just hammer thought he wave build-up and power on. These amps made me think that they could power through any wave build-up without any restraint and laugh at the thought of being tired. For those who don't jive my analogy, let's just say to our ears it was if someone added jet-fuel to the amps (vs. our Stereo version). Frankly, we both didn't get this feeling with either the original Monos or the Stereo version even though at the time those didn't seem power-shy at all.
We will be interested in hearing others' opinions as they hear them.
I guess I will need to go change my signature now since these amps are more public knowledge. ;-)
Thanks,