Pass x250.8 vs Boulder 850 vs Spectral DMA250

@Bo1972 It is not a mistery that Franco Serblin (r.i.p.) tested its own products, in the first instance, with Spectral, his personal setup, and (maybe not confirmed) Krell stuff.

In 16 years of time I heard many spectral demos. There was
not even one time that it gave me a smile on my face. What I
said earlier; in a few seconds I can hear to all different
parts which need to be there. There is a lot missing with
Spectral in my personal opinion. In a few demos I really
liked the speed and depth. But.....other things were still
missing. For me this is incomplete. I don't want it. I prefer
and even demand a small and realistic intimate sound. I never
heard any Spectral do this as I want it to be. I hate
classical music played by spectral. It irritated me a few
times. I asked the dealer;do you think a violin sounds like
this? I said: it sound like a clinical violin. That is not
how it sounds in real. This brand I also not even want for
free. Pass labs is superior in emotion compared to Spectral.

"08-19-14: Maz65
@Bo1972 It is not a mistery that Franco Serblin (r.i.p.) tested its own products, in the first instance, with Spectral, his personal setup, and (maybe not confirmed) Krell stuff."

Speaker manufacturers test their speakers with a lot of different amps. They have to make sure the speakers work with a large variety of products. Aside from Krell and Spectral, your speakers were probably tested with another 10-15 amps. At least.

Bo's right about the Spectral amps. They do have a unique sound. You may like it, but there's no way I would buy them without listening to them first. Also, with the Pass amp, you can't put it into the same class as other mosfet amps. Pass is the best guy there is with mosfets. He gets them sounding just as clean as most bipolars. Another amp you may want to look at is Ayre. They do use bipolars, but they don't sound like anything else. For solid state, Ayre is my favorite. But whatever you decide to do, you need to listen for yourself. Going by reviews and opinions is very risky.

I tested a few Ayre amps in the past. They do not have the
width and depth of Pass Labs. I know from email contact that
the new .8 series even have a wider and deeper stage. Only
class a will give you all the colours in the mid freq. you
want and need. Ayre is also in my personal opinion
incomplete. It does not have all the parts for what I call
Total Sound. Same thing; I don't even want them for free!!

@all I mentioned Spectral because the personal home Serblin setup was Spectral (and -not confirmed- Krell KSA also), of course the sepakers are tested on a wide range of amplifiers but sure in the first instance, for the old SF production, was Spectral.

Also for me Spectral is not my taste, even with non-classical music: recently I auditioned a Stradivari + DMA260 + 30SS2 with of course Oracle MIT cabling and the result was poor if you consider the expectations from the level of these electronics.
In other words: when I listen a system like this, I expect a jaw-drop :-)

But I want to give Spectral a chance in my personal setup becuase it is easy for me obtain a power amp from the distributor (who is the same in Italy as Boulder).