Solid state amplifiers and sound stage, especially front to back "depth"


I've been enjoying my trial period with the Van Alstine SET 400 stereo amplifier. When I'm done and have collected my thoughts, I may write up a summary.

In the meantime, a question for folks with more experience. I've noticed is that the amp produces a sound stage that is nicely defined and articulate from left to right, but not as much from front to back. (My Adcom was also unable to create sound stage depth.) I know my room is capable of that sound stage because my tube amp accomplishes it.

Question: Is it typical of solid state amps to have less of a front to back sound stage than tube amps? Do they vary in this regard? Or, perhaps, am I failing to do something -- such as re-position my speakers? (After all, I immediately get that sound stage back when I switch amplifier without moving anything else.)

If you have any experience with solid state amplifiers and sound stage -- front to back, left to right, or whatever, I'm curious.

This is not about me keeping or not keeping the amp. There are many things I already really like about it. But I'm wondering about this aspect.

Thanks.
128x128hilde45
@hilde45 interesting discussion, I just noticed that this seemed to have steered into the tubes vs SS conundrum and I may have missed it but the old speaker synergy could have been overlooked.

I have been going through some changes in my audio system, mainly because I have been struggling with work and money related matters, this is on its way to be solved so I think I will be fine.

I purchased some time ago atmasphere MA-1s, incredible amplifiers which I fell in love with. Initially were used with Klipsch P37F and the Soundstage was great, the detail and transparency unique. Then I acquired AudioKinesis Azel speakers, a big step upgrade over the Klipsch and better sounding with the MA-1s.

Along the way I tried many other tube amps with the Azels, different tubes too, SET amps, PSETs, nothing was comparable to the atmasphere.
Full disclosure I have always been a fan of tube amps.

I had to put the speakers Azels for sale, great speakers, got back the Klipsch and putting the Klipsch with the atmaspheres back so disappointing, not the same lows, glary highs, I thought the Klipsch were really bad, further changes I had to sell the MA-1s too, the day these were picked up I felt like something was lost, but hey you have situations sometimes.

Spent about 3 weeks without music or audio, good friend of mine loaned me a cheap inexpensive modified Adcom GFA-535, hey I don't like SS but this will allow me to listen in the meantime while I restructure my life and Financials.
Connected the Adcom to my Klipsch without expecting anything different that what I would get from a bose single speaker. Wow, the Klipsch became a completely different speaker, meaty, the woofer excursion provides excellent bass, the glare was gone, probably because of roll off on the highs.
Now the Adcom distorts like the atmasphere never did / will, the transparency of the atmasphere is not there either (that magic is lacking) but this doesn't mean it is not musical. I knew the P37F was 96 dB of sensitivity and in my mind for some reason I had 8 ohm nominal which in paper should be good for tubes, going back to the spec it is actually 4 ohm nominal and a few phase issues.
I consider Ralph a friend, a superb smart guy and completely accomplished individual so I'm not trying to compare the atmasphere gear to anything here or detract from it, I'm just mentioning it because it is what I owned. All I'm saying is something most of you know already.
My Klipsch I would never again try to use it with tube amps, I would never also use these for anything else than rock electronic casual listening. My ideal system would still be atmasphere with high efficient speakers for something special.
Just don't make this thread another SS vs tubes discussion, me personally I found now that completely detracting from something (SS in this case) made me blind to reality.



@luisma31 I love that story and hope you get back the gear you clearly deserve.

FYI, I have the Adcom 535 amp and it really does a lot for it's age and non-hi-end nature. In my opinion, it's way undervalued on the used market, because it's great in a pinch!
Thank you for the kind words Hilde, the 535 it is definitely undervalued, my current 535 loan probably doesn’t have much left from its original guts, it has Chris Hoppe’s power supply and other mods https://hoppesbrain.com/ but the sound with 4 ohms speakers like the Klipsch is great considering its value. I had some years ago a Yamaha AS2100, more costly than the modded 535, as good as the Yamaha is can’t compete with this 535, it is an increíble value in Hifi

Edit, I'm a little cynical with a slight oversight here, the Yamaha comparison is totally unfair, the Yamaha was an integrated, the 535 front end is an Atmasphere MP-1, duh