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Old 22nd May 2005, 11:55 AM   #1
Bgt is offline Bgt  Netherlands
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Default OPA627/AD8610 comparison

changed my DAC(Elektor2000) analog output chips from OPA627 to AD8610. There are 4 of them 2 for the I/U conversion and 2 for the filter. Ok the AD8610 sounds bright. Sometimes a bit too bright. The Sssss sounds are not so nice as on the OPA627. Tried different speakers and the symtom stays. Amps are 2xUCD400 with AD8620's and a passive preamp. Dac unit is snubberized.
Anyone has the same experience?
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Old 22nd May 2005, 12:46 PM   #2
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Default hmmmmm

Everything is so dependant on outside factors, but actrually I have noticed exactly the opposite.

I actually prefer the 8610/20 as much warmer less sybilant than the 627/637.

And now I am trying the LT1115(low voltage noise) and LT1028(low current noise) both with great success. So much so that I find it equal to the 8620 on everything I have listened to so far.

Also I can state that the LT1010 seems to be at least as good as the buf634, especially when fully biased.
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Old 22nd May 2005, 12:54 PM   #3
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Yes. The 8610 improves greatly with a buffer under the feedback loop. Imo the end result is better than a 627 alone or a 627+buf. It certainly is system/taste dependent.
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Old 22nd May 2005, 03:05 PM   #4
Bgt is offline Bgt  Netherlands
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Quote:
but actually I have noticed exactly the opposite
Funny, how, probably outside influences, play such a role in the listening experience.
I will keep on testing it with all kind of music to see if the difference remains .
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Old 1st June 2005, 03:42 PM   #5
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Default Re: OPA627/AD8610 comparison

Quote:
Originally posted by Bgt
the AD8610 sounds bright. Sometimes a bit too bright. The Sssss sounds are not so nice as on the OPA627.
I was under exactly same impression when I tried both chips in ML380 preamp. I was running AD8610 at 15V rails, some say 12V is better.
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Old 1st June 2005, 03:48 PM   #6
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15V is above the max on the 8610/20 datasheet. In my tests this opamp sounds best between +/-10V and +/-12V above that and it gets nasty. For kicks I even tested it down to +/-5V and it still sounded great.

Above 12V the 627/637 are definately better. I still am not convinced the 627/637 are any better than the LT1115. But they are indeed much better than the opa227/228.
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