While this won't constitute a full assessment of the amp, now at the 7 day mark and with probably 100 hours on it, the JVC has passed up the Norh SE-9. But with the following caveats: Not being able to A/B the two amps and granting that my speakers are also breaking in it is hard to be certain that my comparisons are entirely fair.
This JVC (the RX-ES1SL) has no modifications whatsoever. I don't forsee doing any either, unless those really cheesy spring clip speaker connectors fail.
About the only area where I think the Norh bests the JVC is in instrumental timbre. I have a sense that the Norh yields a more faithful representation of the actual tone of the instruments. And even here, I think this statement may only be true in a fairly narrow frequency range, say, about 200 hz. to 1000 hz.
All other areas are either a tie or the JVC comes out on top. I can give you the following as a means of indicating "treble extension". I have a HDCD Reference Recordings Dallas Wind Symphony called "Bells for Stokowski". Until the JVC played this recording, I didn't really get why they gave it that title. But the JVC lets me hear all these really great sounds coming from the back of the group which are all high freq. bells, triangles, chimes, xylophones etc. With the Norh I never noticed them before. I am sure you can hear them with the Norh, it's just that they are unremarkable.
A lot has been written about how well cymbals are reproduced with various hardware implementations. The JVC/Norh combo gives me what I believe mimics well what I heard in my many years in orchestras, concert bands, and jazz/rock/stage/club bands.
Surprisingly, the bass is not as great a leap forward with the JVC over the Norh as with the treble. But there is a leap and it is a qualitative leap not a quantitative one. I am sure the 8" driver in the Omega Grande8R is the reason here.
Soundstaging/imaging is now in my mind a function of the recording, not the equipment, since both perform well if the recording has the information.
I consider the breakin period over. Any thing beyond this point is gravy.
The chairguy seems worried that he may be pushing an amp that really isn't that good as if he doesn't trust his ears. Well, he can relax. I am very pleased with my purchase. My JVC/Omega bedroom system sounds so good, I wonder what my poor "reference" living room system is thinking about all this.