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Audio GD SA-31 head amp/ preamp . A powerfull Head Amp with Diamond Difference design . - Page 20

post #286 of 362

I'm finding myself (unexpectedly) enjoying the combination of SA-31 and HD600 more and more. Have just got back from a weekend business trip to Hainan and am listening to Jean-Guihen Queyras play Haydn's second Cello Concerto (with the Freiburger Barockorchester under Petra Muellejans). An excellent recording, by the way (Harmonia Mundi HMX 2961816).

 

Gain is set to low, volume to 40.

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post #287 of 362

CJG888, I assume SA-31 has the characteristics similar with my Graham Slee Solo UL but might be better in SQ. This kind of sound is particular suitable to pair with most of Sennheiser cans.

post #288 of 362
It keeps getting better.

Bill Evans Trio: Sunday at the Village Vanguard via the HE-500s tonight smily_headphones1.gif
post #289 of 362

Is the listed power rating for SE or Balanced output?

post #290 of 362
Quote:
Originally Posted by Uchiya View Post

Is the listed power rating for SE or Balanced output?

 

The SA-31 is single ended only. The 4 pin XLR is just for connection flexibility with balanced headphones but is still a SE output.

post #291 of 362

Hi there

I have a few questions regarding the sa31:

 

Does it have above average bass-slam or is it neutral in the bass region?

 

I consider the Just Audio uha-120 to have above average in bass for reference. Has anyone heard both and would be so kind to do a quick comparison?

post #292 of 362

I can only tell you about the SA-31, and of course only my opinion, and with my phones. So far I've tried it mostly with the Beyerdynamic T1, Hifiman HE-500 and Denon AH-D5000. With the T1 I feel that the bass is very neutral. With the HE-500 the bass was punchy and fun, and with the Denons, which are known to be punchy and fun, the bass was surprisingly controlled (a great combination, except for the high sensitivity of the headphones, which made for a very limited volume range with this amp).

 

I'm not sure what the right conclusion should be, but I believe the amp is very neutral in the bass region, but with plenty of power and control. It's not a neutral that is limited in any way.

post #293 of 362
Ok, thank you very much for your precise answer, I appreciate it.
post #294 of 362

The SA-31 is neutral with an ever so slightly rolled-off treble.

It gets its warmth from harmonic distortion rather than rolled-off bass & treble like some tube gear tend to have ('n'-shaped?).

post #295 of 362
Brilliant, I know exactly what you mean. Thank you.
post #296 of 362

Out now! A refined control, higher gain and power SA-31se promo in for ordering.

Great or not for HE-6, we shall see..

 

http://www.audio-gd.com/Pro/SA/SA31/SA31EN.htm

 

 

What's new on the SA-31SE:
1, Boost the gain from 10DB (SA-31)  to 20DB (High gain model on SA-31SE), even with low output level sources ( like 1.5VRMS), still have enough gain and power for drive the HE6 and low sensitivity headphones.


2, For the high sensitivity headphone and preamp output model , we have redesign the new exponential volume control board built in 14 pcs relays (SA-31 only had 8 pcs), it have 100 steps and 100DB level control range, allow users  very fine to adjust the volume.


The below picture show the volume characteristic , green is with the SA-31, red is with the SA-31SE .
Volume.JPG
3, Redesign the control software, users can quite quickly continuous adjust the volume on front panel, from volume 0 to volume 50, only need around 5 seconds.


4, Built in OCC wires .

post #297 of 362
Brilliant! You buy something, and a month later it is obsolete...

At least in the automotive industry, we manage our run-outs properly.

mad.gif



Anyone know if the new volume control board can be retro-fitted?

I may just get tempted to take it all apart and get tweaking....


Does anyone know of a source of Black Gate capacitors?
Edited by CJG888 - 7/19/13 at 10:08pm
post #298 of 362
Quote:

Anyone know if the new volume control board can be retro-fitted?
 

 

I have no idea, but I know it was very easy to swap the old volume board for one with different gain settings, so it could - maybe - be possible.

 

I know some people thought the gain was low on the SA-31. For me it seemed a little high, or at least a little bit difficult to set to the desired volume at lower volume levels, so I bought a volume card with lower gain. Perhaps Kingwa has found a good balance now, with volume steps that are exponential instead of linear.

post #299 of 362
I find the volume control OK with the HE-500 and HD600, but with the ATH-A900X, I can only safely go up to about 15 on low gain!

Also, I wonder if the revised choice of internal wiring may brighten the sound up a bit. At some point in the future (when I have more time), I might consider trying silver hook-up wire.
post #300 of 362
Still no button for the warmth setting, argh!
The faster volume control is much welcomed, though.
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