Experience with Moon by Simaudio amps & preamps

Perhaps I should explain my use if the word harsh in conjunction with the Moon. I chose the wrong word… I just should have said analytical / details highlighted. It was not fatiguing at all. Fatigue is caused by copious quantities of distortion and noise. I am talking about very high end gear here… so the degree is small. The sound was very detailed but a touch analytical in the upper reaches, with good space in the soundstage between images. The overall impression of each sound is natural, but less so on the edges and particularly to me when taken together. I found the treble to not be as pure and sweet as the real thing and definitely a bit forward. This to me is a bit hard (better word than harsh)… I am very sensitive to this. The leanness in the midrange did not help offset this. This was complemented by a similar leanness in the Pass. But these are the things that can be seen as small but add up to the overall gestalt of a system.

So while the differences in details can be small the overall result can be large and easily discernible. I can tell a Mac system within a few seconds… lack of detail, good midrange and a preponderance of bass. An Audio Research system, highly detailed, well defined and articulated bass, rich midrange boom… details not glaring. By process of elimination (if I knew there were these three systems as a possibility) I could within 30 seconds determine which was the Sim system… highly detailed, balanced across the spectrum, natural sounding, quiet background, but with details highlighted a bit. The Sim would be a bit harder to pick out as it sounds a bit like a number of good high end solid state manufacturers. 

All of these companies produce outstanding products. Each with there own character. The important thing is to match your own tastes to the appropriate company.

I owned a Sim Moon 650D DAC/CD for many years. I added a 820 power supply which doubled the cost, but also significantly improved the noise floor and overall presentation. I did not buy the 750D because it was clear it would be too revealing and harsh. Most of this time I owned Sonus Faber Olympica 3. My amp was a Pass x350.. with a Audio Reseach REF 5SE preamp. I did lots of analysis of my system and realized while it was very detailed, it was too harsh and not musical enough.

I ended up moving piece by piece to all tube gear. Each step moved me towards a more musical system with much better bass and details in a natural balance... like live music.

If you like Mac… and many people do. The fact that you like music loud (I listen at ~70db)… especially if it is rock, then MacIntosh may be your solution. Personally I am not a MAC fan. Too little detail and too bass heavy. But that is a personal preference. So, maybe look at upgrading in the MacIntosh family. Although you are looking for more detail… so Mac might not be your ticket.

You seem to be looking for higher resolution and very natural sound across the spectrum, maybe look at a used high end Audio Research preamp… then save up for a ARC amp. There are two camps that are strong with the Sonus Faber speaker… Mac and Audio Research. They are completely different camps. I would recommend finding a dealer that carries these and listen to an all Mac system and an all Audio Research system… see which one moves you. If none are nearby… take a trip… call up a couple dealers, make appointments, have them set up a system for you.

Looking at your system and post… you are at a crossroads… the next step is really important. You need a clear vision of where you want to go. I really doubt Sim Moon is it.