High value, high efficiency speakers for SET amps


Hi, Gang,
I know that some of what I want to discuss here has been dealt with in other threads, some of them quite old, but I wanted to see if any of you fine, knowledgable folks are willing to help update and consolidate some of this info in a more current thread.
I am currently running my new Audio Note Kit 1 300B SET amp with a pair of Reference 3A De Capo speakers. I think it's a fine pairing and I am really enjoying what the 300B SET experience brings to the table in terms of musicality and emotional connection.
Still the De Capo, while supposedly an easy load due to its crossover-less design (only 1 cap on the tweeter with the mid-woofer directly coupled to the amp), is "only" rated at 92 db efficient, and based on the most recent Canadian NRC specs, that rating may be optimistic.
So, I am toying with the idea of trying a pair of more efficient, deliberately SET-friendly speakers in my rig, something that might also play lower and with greater dynamic swing than the De Capo's. Note that the De Capo's have served me well and I am very fond of them, but I can't help but wonder if my lovely Kit 1 would shine even better coupled to a VERY easy to drive speaker.
Devore and Audio Note are obvious options - the O/96 looks really tasty. Unfortunately, both of those choices are out of my budget, which I'm thinking maxes out (for real) at around $1500. I am willing to consider used equipment.
Tekton Lore 2.0: This is the speaker that Eric Alexander of Tekton has recommended when we've spoken on the phone, based upon my medium-small listening room and amp. I've read the epic "Lore vs. Zu" thread elsewhere in this forum, and clearly Tekton has its enthusiastic fans here. What I wonder is whether the Lore 2.0 has the refinement of the De Capo in terms of resolution, sweet high end and imaging. Audiogon'er Mikirob has pointed me to the many rave reviews of Tekton's speakers and I'm definitely interested.
I've corresponded with the Sonist folks (who are super nice) but their really high-efficiency, nearly-full-range floor stander is out of my budget.
Then there's the "vintage" route, going after some used JBL's or other high-efficiency "classics" from the 80's (or '70's). I am not inclined to go in this direction, but mention it because it's been suggested to me.
And then there's Omega. I spoke to Louis some time ago and he recommended his 7XRS hemp cone model. But I know all the raps on single driver designs and I'm cautious, although I would like to hear from any of you who own or have owned Omega's.
I'm in no rush to make a switch but I am very interested in your thoughts. Thanks, folks!
rebbi
Swampwalker,
You don't have to spend anywhere near that kind of money to reach the SPLs Ralph prefers. I could do that easily with my former transistor and PP tube amplifiers. I didn't want to listen that loudly. I am able to go 95-100 db easily with my current SET and speakers whenever I choose to do so . I've lack the desire to do this regardless of amp/speaker pairing I've owned. The determining factor is preference rather than equipment limitations.
Hi, Guys,
People seem interested in my impressions of the Lore Reference, so I'm happy to oblige.
I wasn't super impressed with them when I first connected them. The sound seemed stuck to the speakers and I kind of got this "home theater" vibe. Of course, this was with my friend staring at me expectantly with that "Well? Well?!" look on his face, so it was a little hard to concentrate.
I proceeded to play with toe-in and placement and things got a lot better. With some more pronounced toe-in and adjustment of distance between the Lores, the sound stage became large and immersive. The disappearing act wasn't quite as complete as what I'm used to with the De Capo's, but again, perhaps with more precise placement...
Additionally, the presentation of the Lores and the De Capo's is quite different. The Lore Reference seemed to splash the soundstage all over the front wall. The De Capo's tend to present a deeper, more layered presentation. This is admittedly hard to describe in words.
Instrumental and vocal tonality seemed very good with the speakers a little more dialed in to position. I remember being particularly impressed with the rendering of a tenor sax solo - sorry, I can't remember the track, but it really sounded like a saxophone in full bloom. I this regard I'd describe the Lore Reference as "exciting" speakers to listen to, and I'd describe the De Capo's as more "nuanced."
There were 3 main things about the Lore Reference speakers that, in my 5 or 6 days with them, I came to appreciate. One was that they could "go big" in a way that the De Capo's don't; this is not surprising since they are substantially larger and more efficient than the De Capo's. They seemed to liberate the Kit 1 and help it to sound like some kind of monster amp, allowing those huge output trannies to strut their stuff. For example, on one of my favorite CD's, an orchestral movie soundtrack, they presented the orchestra in a very "big" and convincing fashion.
Second, having a speaker in the room that at least bumps up against the bottom octave is great. And this richness extends into voices as well, bringing substance to alto and bass voices in background vocals very nicely.
Third, as already mentioned, the Lore Reference nailed some instrument tones and textures in a very convincing way. I was particularly impressed with how well controlled the bass was.
Three things about them gave me pause, though:
As I've mentioned, I found the imaging a bit vague. I also noticed that - as opposed to my De Capo's, which present a very stable image, images with the Lore Reference tended to shift noticeably when I moved my head to the left or right. Again and yet again, this may be a placement issue but it was troubling to me.
Second, they needed to be turned up to a decent volume level to sound fully "awake." I asked Eric about this and he told me that while the Lore Reference is more refined than the Lore or Lore 2.0, the Lore and Lore 2.0 sound much better at lower volumes.
Third, I am not certain that they are as refined and resolving as the De Capo's. I literally mean "not certain," as in, "I just don't know." I'd need more time with them.
No matter which speaker I ultimately choose, I'd give the Lore Reference credit for having motivated me to part with my De Capo's. I was pretty blown away by how big and exciting my SET could sound.
I recognize that at my price level, there will be compromises. I had always thought of my self as a "nuance" guy more than a "dynamics" guy, but I found the latter surprisingly compelling, which is why one or another Tekton model is still on my list of possibilities. I also recognize that all the speakers I'm considering provide a trial period, and I'm prepared for some trial and error in getting where I ultimately want to be.
I hope this helps. My De Capo's just sold and so I'm now in a better position to see what I can afford. I'll keep you posted.
"I had always thought of my self as a "nuance" guy more than a "dynamics" guy, but I found the latter surprisingly compelling, which is why one or another Tekton model is still on my list of possibilities."

I want both! Great post and insight as always Rebbi!
Charles- I was talking about realistic loudness AND the SQ/nuance/timber/microdynamics, etc, etc, we've come to expect from the best SET/OTL amps,
The question isnt how loud you can play, but at what distortion is at that volume level. Until i used a SS amp, this was tough to understand.