sound Quality of OPA549 when compared with LM3886 - Page 2 - diyAudio
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Old 1st September 2012, 01:30 PM   #11
juma is offline juma  Germany
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Quote:
Originally Posted by rhythmsandy View Post
hi juma the sch is not opening can u attach it somewhere else...
Post #16:
SuSy amp sa inv. OPA549 - Solid State - diyaudio.rs
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Old 3rd September 2012, 06:52 PM   #12
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yeah its working thank you... but its still unbelievable that OPA549 sounds like Audionote. Anyway Im building one version but would like to know more experiences.
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Old 4th September 2012, 12:56 PM   #13
AndrewT is offline AndrewT  Scotland
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Which Audionote do you have?
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Old 4th September 2012, 11:44 PM   #14
juma is offline juma  Germany
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Quote:
Originally Posted by rhythmsandy View Post
...but its still unbelievable that OPA549 sounds like Audionote....
No, it sounds better (not a big fan of Audionote). Not much of a believer too. I build and test.
Anyway, the SuSy circuit shown in post #6 is the best amp that can be built with OPA549. If you want to go with a single chip per channel, the best sounding solution is the amp based on Walt Jung's paper on composite amplifiers (see sch.) where the sound character of an amp is predominantly determined by input OpAmp.
OPA549 used alone in standard GC configuration sounds inferior to LM3886.
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Last edited by juma; 4th September 2012 at 11:46 PM.
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Old 5th September 2012, 12:39 AM   #15
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I liked the OPA541 because of the jfet inputs. I did not like the crossover distortion, which is especially visible during square wave testing. I had a brief flirtation with chip amps, but get more pleasing audible results with tube amps and solid state Class A.
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Old 5th September 2012, 03:38 AM   #16
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hi andrew please read this link.. OPA541 and OPA549
LM3875 vs LM3886 vs LM4780

Hi Juma thanks alot Iam using OPA1612 as pre for the opa549. Soon or later I will be using OPA627 for the amps.

I do accept that audio note is a pure classic way of building amps but I generally dont believe 100% on figures since I believe that clarity and musicality are two different worlds...

In my experience i found many amps which are very very clear but fail to drag into musicality..

so I personally judge the amps based on listening but generally take opinions of people since if some experienced audiophile says this is good and this is way too good and beyond expectations then I try that instead of wasting money on every single schematic..

Last edited by rhythmsandy; 5th September 2012 at 04:03 AM.
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Old 5th September 2012, 10:20 AM   #17
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by rhythmsandy View Post
hi andrew please read this link.. OPA541 and OPA549
LM3875 vs LM3886 vs LM4780
Me?
Which posts?
What topic do you want to refer to?
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Old 5th September 2012, 11:33 AM   #18
juma is offline juma  Germany
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Quote:
Originally Posted by rhythmsandy View Post
... Hi Juma thanks alot Iam using OPA1612 as pre for the opa549. Soon or later I will be using OPA627 for the amps. ...
It's not about preamp - if you look carefully at the schematic in post #14 you'll see the nested feedback/composite structure. Here is the Walt Jung's article on the subject:
www.designfactory.co.za/audio/CLD.pdf
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Old 5th September 2012, 06:42 PM   #19
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yeah juma true ive seen it but my pcb is already built i will try in the next design may be in few weeks... but i need to get the best out of this chip..
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Old 21st September 2012, 08:50 PM   #20
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finally the amp is working and im in love with the mids of this chip still its in basic opamp schematic..

I am thinking of using nelson supersymmetry on this... but im pretty ok but if the amp is biased in Class A then i think its worth trying supersymmetry.
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