I can’t say but I will have the same preamp (I demoed a Ref 6 and was sold) driving my Vandersteen M5-HPAs which are hooked up to my 5A Carbons. If I were you I’d audition the M5-HPAs.
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I have basically done the same had Vandy 2s upgraded to Quatros and went from Rogue Cronus to Aesthetix Atlas and Pallene
when I was thinking of making the change amp or speakers I ask Richard he said if the front end is good then the biggest change is going to come from the speakers both are great amps but maybe a pair of Sevens or Ref160 monos that is how got Quatros before the Aesthetixs
Enjoy the Music
I moved from the Ref 150 to Ref 150 with KT 150s which ARC reps told me was almost as good as the Ref 150se. Then I moved up to Ref160 monos. There was a difference between my Ref 150 with KT150s and the Ref 160 monos but it was maybe 15 percent for twice the price. I assume the Ref 160s would be in the range of 10 to 12 percent better than your amp. It will be a noticeable difference but not a huge difference.
But when you move up from the fabulous Ref 150 to any amp in that power range, you reach the point of diminishing returns.
The the price for the improvement is dear and not mathematically proportionate to the gains. Would I do it again? Hell yes.
@gpgr4blu You bring up an interesting point. When was it that any gear manufacturer stated that their latest and greatest, which now costs 2-3X the last product, was in fact only 'maybe 15 percent' better? I can not recall one instance of this...
To that, there are many well known examples of gear that was replaced with the 'latest and greatest' that is in fact inferior to what it is replacing- and sometimes by several degrees! Not once was the price lowered though with the new introduction. Pays to listen to all new gear in consideration before a purchase, and not go by the 'hype' that inevitably is attached to it, IMHO.
This thread is almost 8 months old, but I would like to respond to gpgr4blu's last post. Gpgr4blu said that:
I moved from the Ref 150 to Ref 150 with KT 150s which ARC reps told me was almost as good as the Ref 150se. Then I moved up to Ref160 monos. There was a difference between my Ref 150 with KT150s and the Ref 160 monos but it was maybe 15 percent for twice the price. I assume the Ref 160s would be in the range of 10 to 12 percent better than your amp.Obviously, unless one could do an A/B comparison of the Ref 150SE to the Ref 160 in one's own home on one's own gear, and after break-in, it is difficult to speculate how much better one amp will sound over the other in a shoot-out.
But FWIW, here's an experience I had with my Ref 150 amp that may have some bearing on gpgr4blu's comment. Some 5 or 6 years ago, I incrementally tweaked my Ref 150 amp. First, I swapped out the stock KT-120s for 3rd party vendor KT-150s. No question, there was a noticeable incremental improvement in SQ. Next, I sprung for the SE factory upgrade, which included ARC matched KT-150s.
If I recall, the SE upgrade included the replacement of a bunch of passives and maybe the power supply caps too. The SQ improvement was much more than "just incremental," ... it was significant.
So, ... going back to what gpgr4blu posted, I surmise that if I could do the Ref 150SE/Ref 160 shoot-out in my house and on my equipment, even if I stipulate that the Ref 160 sounds better than the Ref 150SE, ... I surmise the difference might be less than the 15% delta reported by gpgr4blu.
Reason: gpgr4blue compared the Ref 150 w/KT-150 tubes (but not the SE upgrade) to the Ref 160. Because, IMO, the SE upgrade effected a significant improvement in SQ, I surmise the improved Ref 150SE might nudge a little closer in SQ to the Ref 160.
IME, at some point in the OJ making process, a hard squeeze only yields a small amount of juice.
That said, I look forward to reading comments from folks who A/B'ed the Ref 150SE to the Ref 160 under controlled conditions.
You could very well be right. My Ref 150 with KT150s was one sweet little brut. I'm sure the Ref150SE was better.
I maintain that the Ref 150 series amps from ARC are among the best bang for the buck (now used) gear in high end audio. Of course, my comments do not any account for the fact that the monos do have imaging and stereo separation that a stereo amp cannot match -but as for other aspects of sound, there are diminishing returns. That said, I do not regret the purchase of the monos.
Since initiating this discussion I ended up trading in my Ref 150 for a Ref 160S. It’s a wonderful amp (although I could easily live without the stupid “ghost meters”). I never did hear a 150SE In my system, but I do agree that each of the steps discussed in this thread brings about only incremental improvement. The 160S does get the blue ribbon for sound staging, however. Thanks to everyone who contributed their thoughts!