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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
atmasphere's avatar
atmasphere
11,993 posts
 
@niodari FWIW we've been working on a class D amp of our own design for the last 4 years. It **should** not matter to reproduce depth if the amp is tube or solid state. But the simple fact is most solid state designs have troubles in this regard- but not all. 
hilde45's avatar
hilde45 OP
5,164 posts
 
The most recent podcast from Darren and Duncan sheds some light on the issue of left right and depth soundstage, particularly the kinds of factors involved in the design responsible for enhancing or limiting them. Also some interesting comments about class D amps and soundstage. Look for the episode with the title mentioning sonic holography. 
erik_squires
16,444 posts
 
No one is going to like this, but asides from room acoustics behind and in front of the listener, frequency changes can really alter our perception of imaging, and in this regard, I can see tube gear, more susceptible to speaker impedances, being more likely to produce some of these effects.
mahgister's avatar
mahgister
13,211 posts
 
No one is going to like this, but asides from room acoustics behind and in front of the listener, frequency changes can really alter our perception of imaging, and in this regard, I can see tube gear, more susceptible to speaker impedances, being more likely to produce some of these effects.
On the contrary many will like what you say....
Because it is right...

An Helmholtz resonator damp some frequency and enhance and diffuse some other.... It is a physical acoustical fact...A grid of many modify the pressure zones of the room and the imaging detph perception for sure...

And you are right this have an impact on imaging and his articulation with the soundstage and also with the listener envelopment factor in relation with source width...

But tube gear or not, if the S.S. is well designed like my vintage Sansui AU 7700, it work....

For tube gear effect atmasphere explained clearly why it is so and why you are right...

But no tube gear can replace acoustic control, and  acoustic control cannot redeem a bad S.S. design....

My best to you....




hilde45's avatar
hilde45 OP
5,164 posts
 
Agree, Erik. 
Mahgister, helmholtz controls sound very interesting. Can you refer me to some threads where they're mentioned so I can read up on them? All the best,
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