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Old 19th March 2012, 08:56 PM   #1
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Default What causes reduced spatial ambience?

I built me an amplifier based on the J2 concept and used matched JFETs and so on. The amplifier is overall awesome! I love it!

In my system this amplifier provide lower sense of room ambience compared to an Atma-Sphere S30 OTL (2 dB feedback).
The two amplifiers is comparable for everything else on my speakers (the JFET amp do have better bass grip though).

As I own the JFET amp and not the OTL I want to improve my amp (you know... the first fix was free and I really need that fix - now! )

So... What can cause the reduced spatial ambience? Feedback? Capacitance in PSU?
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Old 19th March 2012, 09:04 PM   #2
a.wayne is offline a.wayne  United States
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Atmas-phere will have bigger halo sound due to hollowstate devices, may i suggest the use of some headphones, fed from direct source and see which is closer or which is effects box ...


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Old 19th March 2012, 09:17 PM   #3
SY is offline SY  United States
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An OTL will have a high output impedance, so unless your speakers have a perfectly flat impedance curve (and they likely don't), the frequency response will be different between the two different amps.
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Old 19th March 2012, 10:45 PM   #4
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Quote:
Originally Posted by a.wayne View Post
Atmas-phere will have bigger halo sound due to hollowstate devices, may i suggest the use of some headphones, fed from direct source and see which is closer or which is effects box ...
Thanks, I've no headphones.
I find the OTL to be very neutral (whatever that is) and as detailed as the J2 variant I built but with better sense of the room by having more air around acoustic instruments on good recordings (like Jazz at the Pawnshop).
I like to hear the same from my SS amp...

My primary PP tube without feedback does not provide the great sense of spatial ambience either.
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Last edited by Nelson Bass; 19th March 2012 at 10:52 PM.
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Old 19th March 2012, 10:47 PM   #5
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Quote:
Originally Posted by SY View Post
An OTL will have a high output impedance, so unless your speakers have a perfectly flat impedance curve (and they likely don't), the frequency response will be different between the two different amps.
I'm aware of that but does that cause better sense of ambience?
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Old 19th March 2012, 11:06 PM   #6
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try a resistor between amp and speaker to lower the damping factor of the ss amp.
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Old 19th March 2012, 11:15 PM   #7
SY is offline SY  United States
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Quote:
Originally Posted by Nelson Bass View Post
I'm aware of that but does that cause better sense of ambience?
It will certainly change the sound; how your ears/brain interpret that is something only you can find out.
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Old 19th March 2012, 11:23 PM   #8
Floric is offline Floric  Europe
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Hi,

made similar experiences, always wondering where it came from.

Quote:
Originally Posted by Nelson Bass View Post
(the JFET amp do have better bass grip though).
:
Any other tonal differences? Those affect the spatial perception very much.

Regards
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Old 19th March 2012, 11:38 PM   #9
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Thanks, I'll add the resistors and report back.

At first I found the J2 variant to have too much presence in the treble area but got used to it. The midrange area is gorgeous via both amps.
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Old 19th March 2012, 11:51 PM   #10
a.wayne is offline a.wayne  United States
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What speakers are you using .... ?
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