sound Quality of OPA549 when compared with LM3886 - diyAudio
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Old 30th August 2012, 09:58 AM   #1
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Default sound Quality of OPA549 when compared with LM3886

Is OPA549 good quality chip? is it better in terms of sound quality when compared with LM3886?

i saw this thread where 549 compared with Audio note... which is just awesome.. OPA541 and OPA549

but why its not used much? I see alot of people using LM3886..
I have OPA549 3 units in hand but im thinking of choosing lm3886.
any opinion on audio quality of OPA549..
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Old 30th August 2012, 02:48 PM   #2
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did anybody used it?
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Old 30th August 2012, 03:24 PM   #3
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Quote:
Originally Posted by rhythmsandy View Post
did anybody used it?
Did anybody used the search function?

There are 62 threads on the forum with "OPA549" in the title; try reading a few of them instead of making a new one for every question you have about it.

diyAudio - Search Results
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Old 30th August 2012, 03:53 PM   #4
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searched and found few but there is pretty less information. I see more people using LM3886 instead of OPA549. So just thought to start a thread on OPA549.

I found even peter daniel says about it as initially it was not good but after burning for a day it sounded more resolution and good vocals.

Anyway I have the OPA549 ill try myself using that but if i could get any design ideas that makes it better would be a better... like using washers improved some part etc..
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Old 30th August 2012, 04:06 PM   #5
jcx is offline jcx  United States
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the OPA549 datasheet has no useful audio distortion curves

the related OPA541 does - and shows the worst possible distortion profile for audio - the distortion rises at low levels indicating output crossover distortion


most specialized audio chip amps show low distortion at various power levels with much better profile than OPA541

LM3886, other audio chip amps have more loop gain due to decompensation for Av_min >10x compared to these internal unity gain compensated industrial power op amps

likely also have output protection circuitry better tuned to audio demands


there really is no reason to believe that either of the OPA541, 549 have anything special to offer in audio
except that they are different, more expensive - both of which attract some novelty interest

Ray Samuels Aduio gets away with selling a US$3k headphone amp with bridged OPA541

Last edited by jcx; 30th August 2012 at 04:18 PM.
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Old 31st August 2012, 11:34 PM   #6
juma is offline juma  Germany
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I used OPA549 as an audio amp too, in Nelson's Super Symmetry topology. That's the only AB class amp that I kept and still listen to occasionally - it regularly surpasses the expectations.

Here is the sch. (small error - 220p caps should be 5-10 times smaller)
Click the image to open in full size.
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Old 1st September 2012, 08:59 AM   #7
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hi juma the sch is not opening can u attach it somewhere else...
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Old 1st September 2012, 12:05 PM   #8
AndrewT is offline AndrewT  Scotland
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The pic is opening to 1000x416.
I can read it easily.
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Old 1st September 2012, 12:08 PM   #9
AndrewT is offline AndrewT  Scotland
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Juma,
what impedance/resistance does the buffer see?

Is the +IN @ PIN8 a virtual earth, due to the cross-coupled feedback?
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Old 1st September 2012, 01:27 PM   #10
juma is offline juma  Germany
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Quote:
Originally Posted by AndrewT View Post
Juma,
what impedance/resistance does the buffer see?
3k3

Quote:
Originally Posted by AndrewT View Post
Is the +IN @ PIN8 a virtual earth, due to the cross-coupled feedback?
It would be at the same potential even with straight feedback network (simple bridge topology, providing that OPA549 works in NI configuration)
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