PassLabs 350.8 versus Ayre MXR Twenty


I just purchased an ARC Ref 6 line stage and looking to up grade my amp. Currently have a VTL S200.

I have the opportunity to get a new PS 350.8 or wait until I have the funds for a used MXR Twenty.

Has anybody heard these two and been able to compare them? I understand they combine the best of SS with also a tube like quality.

Despite all the raves of the PS I'm a bit reluctant because of the size and weight because I have limited real estate, The Ayres I could handle myself and have room on my racks for them.

I know these are both fairly popular heavyweight players and at this point I want a lifer.

So do I get one or hold out a little while for the other.

Any of your opinions would be appreciated especially if you've heard the two.

Thanks very much.  

vindanpar
@vindanpar I think you really should listen to both amps with your pre and speakers.

But here are my $0.02 for what it’s worth.

I very nearly got some non Twenty MX R’s. I ended up with the X350.8

I have not heard the Ayre MX R Twenty but have heard the VX R Twenty in a demo system, paired with the KX R Twenty, driving Aerial Acoustics speakers. The dealer A B ’ed them with some Pass XA 200.5 monos. The Pass were driven by ARC Ref 5 SE. In that setup, I preferred the Pass and ARC pairing overall. It sounded fuller and more musical. The VX R Twenty was more articulate and refined. There was more inner detail. I wouldn’t have called the VX R Twenty lean but it did have less body compared to the Pass.

I had my initial shortlist down to non Twenty MX R’s and a X250.8. In my previous system with Dynaudio speakers and a Cary SLP 05 pre, I preferred the non Twenty VX R to a Krell FPB series amp. The highs were less strident, it was slightly rolled off - in a good way. In another demo system, with Avalon speakers, I also preferred non Twenty MX R’s to a D’ Agostino Master Power Classic. The Ayre had a better musical flow.

However, the deal I had on some non Twenty MX R’s fell through and I ended up getting a X350.8. The Pass was more full and visceral sounding than the Ayre with great timbre all throughout. The bass slam was impressive - not so much as the older Krell type slam, I don’t think anything will beat that - but more textured and less of a one note presentation. If my memory serves me, the treble is smoother and more extended than the X 0.5 series, where there was still some hardness and grain in the highs. However, the midrange is not as warm as the X 0.5 series. Vocals are more clear and natural sounding but the midrange emphasis that made them so alluring on the X 0.5 series is not so much there.

Overall, the Pass will probably have better grip and control of hard to drive speakers than the Ayre will and give you better bass slam and a fuller presentation. Although Dali Epicon’s aren’t as difficult a load as say Dynaudio. I have heard them successfully driven by medium powered tube amps.

Strangely enough, one of the pro’s for the non Twenty MX R’s for me was also the smaller form factor and easier transportability you cite. The X350.8 is big and a heavy 2 person load.

I could have lived with either the non Twenty MX R or the X 350.8 in my system. I can only imagine that the Twenty versions are better, especially if they improved the bass performance from what I have read. I wouldn’t describe either as tube like as many do. At least not in the way Conrad Johnson amps sound - that is another sense of harmonic richness that no solid state amp can give.
Audio Research Preamps and Pass Labs Amps are known to be Killer Combination.

I agree that these companies make a great combination. I am running a ARC Ref 5 with a pair of Pass Labs XA-100.5 mono-blocks.


Cary Audio SLP-05, Passlabs XA60.5 driving Goldenear Triton Ones.
Detail, spaciousness, and clean tight Bass to die for with the Triton's built-in 1600 watt sub amps and six bass drivers.
I agree with others that suggest to audition both amps in your system, but realistically I don't know how you arrange for that.

FWIW, I owned the Ayre MXR-20s and the Pass Labs X350.8 at the same time.  My speakers are Rockport Altairs.  They're not a difficult load, but they need an amp with ample current to correctly manage the 15 inch woofers. The X350.8 did a better job with this which led to better speaker coherence so there was less gaps at various frequencies.  I used a decibel meter and test tones from 10Hz to 50KKz (way beyond my audible range and likely my dog's as well).  The Ayres had measurable gaps (lower DB levels) in the lower frequency range 50Hz - 120Hz area.  I think this is why I got better slam and a better overall presentation with the X350.8.

Then there's the cost factor.  Even if the 2 amps were the same cost, I'd still probably choose the X350.8.  At the retail and pre-owned prices of each, it makes the X350.8 a bargain IMO.

I have since moved on to a Boulder 2060 which I'll never part with, but it is large and heavy and likely overkill for your speakers.

If you can't audition both, then my vote would be for the X350.8.  Hope this helps.