Wilson Sasha W/P amplifier pairing


I acquired a pair of Wilson Sasha W/P speakers this year. They’re Series 1 Sasha’s. Now trying to find great mono blocks to power them. My other system has Harbeth Speakers and a Pass Labs amp, I love the combo and can listen for hours without fatigue. I’d really prefer something warm and non fatiguing for the Sasha’s. 
 

Amps I’ve tried so far:

Pass Labs X350 - too bright and forward, etched vocals, not a lot of sparkle but plenty of authority

Pass Labs INT-30A - much better all around than the X350 but still too bright and forward. Not nearly enough power for Sasha. End result is too cold and thin

Bob Latino ST-120 - this is a $1200 kit tube amp I built. 60WPC. This amp was surprisingly kind of magical with Sasha.  Never fatiguing and full bodied. Unfortunately it went up in smoke because I can’t solder.

 

Mono blocks I’m considering:

Audio Research Ref 160M

Lamm 1.2 Reference

Pass Labs XA100.8

 

Preamp is a PrimaLuna EVO 400. Rega RP3 with Exact cart. Denafrips Ares II DAC streaming Roon via MicroRendu. Any advice welcome. 

audio_bidder

@plaw which Rowland model do you have?
@chayro that’s what I’m afraid of. I’m going to try better amps and see where I end up. In fairness, I haven’t given the Sasha’s the amps they deserve yet. Front end is also pretty entry level. If that doesn’t work I’ll be trialing some Harbeth M40’s. 
@yoyoyaya I’d love to try Pass .8 series but I think I’m ready for tubes. The PrimaLuna EVO 400 is a great preamp. Stereophile and TAS reviewers both asked to keep the review sample as their reference preamp. Take a look at the internals. 

@op. I'm familiar with the preamp. As regards being ready for tubes, the Sasha W/P is a very demanding in terms of its' modulus of impedance.  Do try to audition  a quality class A transistor amplifier and a comparably priced tube amp with your loudspeakers before making a decision.

@audio_bidder I have the Rowland Model 7's - but I am looking for the 625s2 if I can find one used.  I spoke with someone who sold one and he went with the new Rowland 725 Monos which he said were slightly better than the 625s2.  Maybe you have a dealer around that will let you take one home and hook one up.  Nothing like them that I have heard.  You should be able to find some used older Rowlands pretty inexpensively - you will have a pretty sweet system with the Sasha 1's  I think the thing I heard most was a dynamic slam and an intricate soundstage - I know it does not seem that these things can go together but they did.

If Pass is sounding bright, you may want to consider selling the Wilsons

 

That isn't the speaker's fault ... 🤣

Seriously though, Pass is one of the most speaker dependent amps I know of, and that's the best way I know of not to derail this conversation. 

The tweeter in the Sasha 1's is the older inverted titanium tweeter.  It is good but can be a little harsh/edgy with some material and in some set ups.

How do I know?

Because i have owned W/P 7's for 17 years (same tweeter).

Didn't really recognize the edginess until I bought Magico A5's and Joseph Audio Pulsar 2 Graphene's.  The tweeters in both are superior to the older Wilson unit, lower in distortion and yet more transparent.

The Wilson needs a slightly warm amp but something that can handlle low impedence.

Good luck!