Bryston 4B3 vs Mac MC462 vs Pass Labs X250.8, OR... GRYPHON Diablo 300?


Hi,
Over the next few weeks I am organizing in-home demo of  three pre/power amps for my B&W 803D2's, and will purchase whichever sounds best.  I will be testing the following gear, which is based on what's available where live:
-Bryston B173 / 4B3-McIntosh C47 / MC462
-Pass Labs X250.8, if I can get my hands on one (will probably use the C47 pre-amp to test with this)
The Gryphon Diablo 300 is also a candidate.  I've seen some strong comments from others that Gryphon is in another league compared to the others.
My question is, barring what sounds best to me during my auditioning, in general to most people would the Diablo 300 really beat the others in my list?  And, are there any material disadvantages to sound quality considering the Diablo is an integrated vs the other choices?  I don't really care about having separates, but sound is obviously important.
Secondly related to the Gryphon, there is only one Gryphon dealer that is even remotely close to me.  Should that dealer cut ties down the road, or go out of business, does anyone know how I might go about getting service for the Diablo should I require it at some point?  Is that a valid concern?  There are multiple Mac dealers near me so that would not be so much of a concern.

Thanks in advance for any feedback....


nyev
Yeah, interesting. My guess is that Diablo 300 will win in all cases except maybe where for some reason you want active preamp, Diablo's preamp section is passive.
I myself would not compare Diablo 300 to used Pass separates, I would compare it to used Lamm hybrid separates.
From my experience in terms of what I have access to test in my area (which is admittedly limited), Diablo 300 beats all separates at a similar price point. This includes McIntosh C2600/MC452, Bryston 4B3 with various preamps, and the Simaudio 600 integrated. I’ve tested other combinations in-store that were on my long-list before the shortlist gear mentioned above which I tested in-home. I also tried using the Simaudio 600i as a preamp to get a sense of what the 740p preamp might sound like. None of these configurations came even close to the Gryphon integrated in any particular area. Except, maybe, the Simaudio in terms of soundstage and detail, but performance was similar only in that one area. To me the Simaudio sounded dry, a bit analytical, had no drive and not a lot of bass, and didn’t engage me in a musical sense at all. Higher power Simaudio amplifiers would be better, but the overall sonic presentation didn’t appeal to me and sounded lifeless. When I tested all of this gear, I wanted to like them, and even with the Gryphon I wasn’t sure on my first audition. Now that I’ve gone through this process, I’m confident that overall the Gryphon is not even comparable to other options at its price or lower; it was so much more capable and makes it very obvious it is in a different class of gear.
Also, the consensus from many others say you would need to spend double the cost of the Diablo 300 to beat its performance. This includes Whitecamaross (OP of the "Long list of amplifier and my review of each" multi-year thread) who feels I’d need to go to the Luxman pre/pwr 900u system to beat the Diablo, and these are WAY more expensive. That dude has a ton of hands-on experience beyond what any reasonable hobbyist should have and he is worth listening to.
So yes, I am intentionally not giving weight to my concerns around service. And I don’t know that Gryphon has N.A. authorized repair, as I asked my dealer this and I got a bit of a fuzzy answer ("Gryphon engineers can walk technicians through diagnostics over the phone, and its possible that if only one module or board needs switching out that it can be done remotely"). To me it sounds like any real service will require shipping to Gryphon headquarters.  In fact, even my dealer thought they had an issue with their previous demo unit (turned out the unit was fine) and they had to ship it back to Denmark.  In short, I’m resigned to paying a lot in shipping should I require out of warranty service, and hoping that Gryphon continues as a business even without their original founder, which I think is more likely than not. Also, my dealer offered me a similar deal to the one Jetter referenced on Audiogon, on their demo Diablo which I tested. I considered this as they would include the DAC and phono modules which is a huge value, but in the end I don’t think I can get over two cosmetic scratches on their demo unit, even though they are minor. Also they have no history of the unit, it was simply provided as a "distributor demo". So I think I will be going with a new Diablo with the DAC module, instead of the demo option. The internal DAC module on its own performs so well, that this in itself warrants getting excited about!
If your funds are good you might consider getting $2500 phono as well. You may not need it now but who knows about the future ? And also, if you ever decide to sell the Diablo this will add value in many cases. With both phono and dac this will be a complete machine.
I am a sucker for being upsold, careful :)  Yes I could consider the phono module as well, but my goal is to, at some point in the future, to get a great turntable and as such I am thinking I'd be better served with an external phono module, possibly tube based.  I really don't know much about turntables or phono stages, but from what others have said, it seems external would be ideal.  Thoughts??  Also, should I go with the internal phono module in the future I'd be fine opening up the unit and installing myself.  In fact I'd enjoy that.  I asked and they said if you are comfortable working with electronics (I am), it is not an issue to install the modules myself.

By all accounts, not from my personal experience, current Gryphon's phono stage module is absolutely best compared to any other solid state integrated. At the very least, it is a very very good phono stage.
Sure, great separate tube or transistor phono will outdo it, I would guess for two or three times the cost plus interconnects and power cord.
And.. if you decide to add that phono module in ten years it may no longer be available.
So..?