Amplifier Pairing with Coherent 15s

Hello all,

About to finalize an order for a pair of Coherent 15s (yay!) and now I'm starting to look at possibilities for amplification for them. Since they are very efficient (I believe 106db efficiency), they can work well with flea amps+, so there's a wide range of possibilities.

I have a few criteria though: I would prefer an integrated amplifier vs separates/mono blocks, both for cost and space reasons, so something like AirTight is out (plus, a bit too expensive anyway). Looking around the $10k range at the higher end.

I don't listen to things super loud, and tend to prefer tube amplification. Music tends to lean majority Jazz, with some other things throw in here and there, but Jazz is the most important genre to get right.

Frank (from Coherent) recommended a couple -

Tektron Two 2A3/50S-i
Mastersound Compact 300B

Some others I've looked into:

Tektron Two 211-i
LTA ZOTL Ultralinear Integrated

I do have a few concerns with hand-crafted, more 'custom' made amps, especially by manufacturers overseas (I'm in the US) - mainly inability to demo them and ease of service/warranty. They also tend to be more difficult to sell in the case of deciding to go a different route, though this is of a lesser concern.

Anyone have any experience with any of these, have any other suggestions to explore, or any other comments?



@bjesien :

Leben CS600 with KT66 would be great. the little 300 is great too but I liked it more for guitar and vocals than thumping bass type of music. I've owned the Mastersound 300BPSE, great amps. There's a compact 300B for sale on Audiomart from a well known speaker maker.


Have you heard the Coherents? I got close to ordering the 12 m a few years ago but just needed to hear them and couldn't. Please post some results.

I'll check that one out. I'm not really a thumping bass music person, so that's not a big concern, but I do wonder how versatile the tiny watt amps are. I'd imagine with speakers of this sensitivity, it should be fine for most things though.

I haven't heard the Coherents myself, so I am taking a bit of a leap of faith. However, I've chatted with a few current owners who listen to similar music and have had a similar 'journey' with gear as me and they can't say enough good things about them. I currently use Tannoy speakers (though not any of the Prestige line) so the Coherents are fairly similar in concept at least. I got to hear some Kensingtons when I was considering a few options, and they were good, but they felt a bit too big for me (and the Turnberrys felt a little too small in person, and didn't sound as good). There are some other small 'boutique' speakers I was interested in like Daedalus, but couldn't get a chance to hear them (and the models I was interested in were beyond my budget anyway). Not sure what the lead time will be on these, but I'll circle back once I get them and sit with them a bit!

Wide and deep soundstage, wonderful midrange and vocals, not overly harsh on the top end, full bass without being too sloppy. Overall, I lean toward liking the slightly more lush/musical tube amps I’ve had in the past vs the hybrids/solid states.

Very helpful stuff. Given that I’d look at the Audio Hungary Qualiton X200 or VAC is also worth a good look. If you can entertain a SET amp the Allnic T-1500 Mk2 could be a really nice amp given what you’re looking for.  Hope this helps, and best of luck.

I have to second the recommendation for the Audio Research I-50. It is an amazing, musical, natural sounding integrated amp. I recently auditioned a Luxman, Pass, and the Audio Research integrated. The Luxman had great knobs and flashy faceplate ($10K), the Pass had great power and excellent rhythm and pace ($10k), but the Audio research caused ne to instantly close my eyes and be completely emursed in the music ($6K)… what a deal!

Oh, another I have been looking at is the Triode Lab 2A3 EVO, but know next to nothing about them.

I am powering my 12’s with a Coincident Dynamo 34SE MKIII amp that puts out a whopping 8 watts. Which is more than enough power for the 12s to sing.

The Coincident is being fed by a Don Sachs 6SN7 linestage.