Good Morning All,
I was just wondering if anyone has experience with a PASS XP-12 / M700 combo and could please share their thoughts. Bonus if anyone has compared the PASS XP-12 and BHK Pre directly (super bonus if comparison was made with a pair of M700s, pushing my luck here).
Thanks!
I can provide direct experience with the BHK preamp and Pass Labs XP-12 preamp. I owned the BHK for a few years and was generally very happy with the performance and sound. This preamp has an unusual volume control circuit that does have a āside effectā when changing volume. You get āminor clicks/popsā at every volume level change and āmore audible clicks/popsā at very specific volume levels (25/53 as I recall). The level of these āticksā is highly dependent on tube triode/pair matching, but even very well matched tubes sometimes exhibit this behavior. Mind you it only occurs during volume changes not while listening at steady levels.
Anyway, Iāve always had huge respect for Nelson Pass (and Wayne Colburn) and wanted to try one of their solid-state preamps. Iāve had the XP-12 for several months now and couldnāt be happier with the sound, build quality and absolutely silent operation even while adjusting volume. My system is now fully solid-state and the XP-12 has many (all?) of the sonic qualities of tube and hybrid gear. Iām a convert.
My system is comprised of the following: Sanders Sound Systems Model 10e hybrid 'stats and Magtech amps, PS Audio DS DAC and SP3 regenerator for source components, Pass XP-12, Jayās Audio CDT2-Mk3 transport, Rega RP10 with Aphelion2 cart and Rega Aura Phono Preamp. It is a very revealing and gratifying system to listen to for hours on end. The Pass preamp did not detract from that in any way.
Edit: Tube rolling can be fun (and expensive) which I tried with the BHK preamp. Each selection provided an audible change (sometimes much better sound quality, sometimes ādifferentā). Other than the audible volume adjustment āquirkā the BHK never gave me any trouble and did sound fantastic.
kcleveland123 -
Thanks for the input. The āquirkinessā is one of my concerns. I understand itās not a huge issue, but personally, I just want to set it and forget it so to speak and not have to worry about tubes and some of the baggage that can come along with them. Not bashing tubes in any way - I have had tubes in my systems in the past, but now Iām kind of in low-maintenance mode. The XP-12 is under consideration because I think it will give a somewhat similar type of sound without the tubes. Weight, energy efficiency, size, and heat are also important factors for me (in addition to sound quality), so the M700s do tick a lot of those boxes for me.
Some folks go absolutely apoplectic when I say this, but since I started using Pass Labs amps and preamps, many different models, and different topologies (class A, class AB), this ex-tube guy believes that the claims of ātube soundā or āsolid state soundā are archaic and useless.
Iām a huge fan of Pass Labs products and Nelson Pass, but I think if youāre assessing options in that price range you may want to consider Codaās 07x preamp as well. Reviews Iāve found for it are quite favorable.
Hi RonP,
I actually donāt disagree with that at all. I think weāre at a point where the same can be said about Class A, vs. A/B and D - a good amp is a good amp. By āsimilar type of soundā in my response, I meant a sound that is more āorganicā than analytical, not SS vs. tube. In other words, Iām not saying, āI want this type of sound, and it can only be achieved with this topologyā if that makes sense.
Over the top sound quality for the money spent! You can believe the reviewsā¦Love mine!
I donāt suppose you did any comparison shopping before finalizing your decision? Iād love to hear how it compares with a Pass XP-22. I think it may outperformā¦
Awesome - Thank you
Same here. 
Since we are talking about pass labs. Can someone comment on the xa.8 vs the x.8 different sounds. Really thinking about used market on the x350.8 w magnepan 20.7. I just donāt know if the xa series would float my boat more. Or if something like the x350.8 would create the system synergy. So any diffs would be appreciated.
The most efficient path to the answers youāre seeking is to speak to Mark at Reno Hifi.
Also, go to Pass Labsā website, click on āMy Passā and then āTechnical Articlesā. That should keep you entertained for quite a while.
No Pass comparisonā¦sorryā¦ I can only compare to what I have owned in the past. Coda wins hands down!
How would you describe sound similarities and differences between Pass Labs and your old tube gear?
First, I still have a couple tube amps, a Decware Zen Triode and a very old Cary Rocket 88 and I listen to them occasionally and I love them.
Second, although there are very real differences in the family of Pass amps; Class A, AB, point 8, the older point 5 amps, they all have a āhouse soundā. Iāve had at least one of each of them and theyāre all wonderful.
Some noticeable differences between Pass and the tube amps are just what one would expect; the SS have better grip, better definition in the bass and upper bass, lower mid regions.
Overall, and trying to avoid the nauseating āaudiophileā bombast, I feel that every Pass amp Iāve owned offers a sense of refinement and believably that just makes me feel like theyāre money well spent. Their influence on the sound of my hifi is ever present.
I āthinkā I understand that sound. Iāve heard a Mark Levinson preamp feeding Mark Levinson monoblocks that fed B&W800D3 speakers. The mids were noticeably grain free, clean, and silky smooth. I noticed this with 20 years of listening to Conrad Johnson tube pre & tube power amps at home.
My favorite characteristic of every Pass amp and preamp that Iāve had is the impeccable mid range.
I will tell that to Nelson Pass & Wayne Coburn. They are my neighbors!
Tell Wayne that I just bought his XP-27 and Iām over the moon with it. 
I will let Wayne know. Heās a really nice guy and a fine neighbor. And Nelson is super laid back. We all live on the northern Sonoma Coast .
Did you buy the unit new ?