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OPA627 vs. AD8610

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OPA627 vs. AD8610

Postby brucethehoon » July 28th, 2011, 8:55 am

I truly love my M3 and can't imagine it getting any better, therefore I'm trying to improve it. I believe this sums up the DIY audiophile experience nicely.

I'm currently sporting the AD8610's in my M3. I've heard people suggesting that the OPA627 is superior (opinion and all that). Just wanted to get an impression from anyone that has one on the value of changing over.

thanks!
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OPA627 vs. AD8610

Postby hagak » July 28th, 2011, 11:59 am

I have both chips because I wanted to see if I could hear a difference. I can not. While I currently am using the 627 chips the only reason I am is cause I paid for them and figured I should use the more expensive chip since I already bought it. :)
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Re: OPA627 vs. AD8610

Postby brucethehoon » July 28th, 2011, 12:11 pm

And that finishes the audiophile experience. The difference is that a TRUE audiophile would have said that the ink used on the 627 added to the innodepth of the timbrewarmth or somesuch. Thanks!
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Re: OPA627 vs. AD8610

Postby dsolodov » July 28th, 2011, 5:09 pm

The charts do not lie. :D Take a pick at the side-to-side charts of AD8610 vs OPA627... http://www.analog.com/static/imported-files/data_sheets/AD8610_8620.pdf.
I voted for ADA4627-1BRZ-ND recently with my $$$ on Digi-Key.
Last edited by dsolodov on July 28th, 2011, 6:45 pm, edited 2 times in total.
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Re: OPA627 vs. AD8610

Postby linux-works » July 28th, 2011, 5:14 pm

whatever you do, get REAL chips. from real places.

if you go ebay, chances are very good that the result won't be...
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Re: OPA627 vs. AD8610

Postby mikeg88 » September 23rd, 2011, 2:55 pm

A little hijack here...

I recently tried some OPA604s and they gave a DC offset of 8mV and 11mV in the Right and Left channels, respectively. The ground channel had no measurable DC offset. Then I swapped to AD744JNs across all three channels, and the DC offset was less than 1mV on all of them. I looked at the spec sheets of the two opamps:

http://www.analog.com/static/imported-f ... /AD744.pdf
http://www.ti.com/lit/ds/symlink/opa604.pdf

From the data sheets, it makes sense that the 744s had so little offset. However, the 604s should not have had more than 5mV offset, so I'm guessing they were out of spec? What are the chances I got 2 out-of-spec out of 3 opamps that I ordered?

It's not critical, because the 744s are working fine.

Has anyone else experienced this?
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Re: OPA627 vs. AD8610

Postby MiniMe » September 23rd, 2011, 4:37 pm

IIRC, and that's a problem, I think my favorite was opa1611's. Articulate but full. Good cross between the 627-8610's.

Now I just use a Mini3 with bigass caps.
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Re: OPA627 vs. AD8610

Postby MisterX » September 23rd, 2011, 6:58 pm

However, the 604s should not have had more than 5mV offset, so I'm guessing they were out of spec?


Are you referring to the input offset voltage? :?
(input offset voltage is the voltage applied between an op-amps' input
terminals to obtain zero volts at the output)
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Re: OPA627 vs. AD8610

Postby amb » September 24th, 2011, 5:08 am

8mV and 11mV are probably normal for OPA604s. These numbers are not high enough for concern anyway.
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Re: OPA627 vs. AD8610

Postby fishski13 » September 25th, 2011, 8:12 pm

brucethehoon wrote:I truly love my M3 and can't imagine it getting any better, therefore I'm trying to improve it. I believe this sums up the DIY audiophile experience nicely.

I'm currently sporting the AD8610's in my M3. I've heard people suggesting that the OPA627 is superior (opinion and all that). Just wanted to get an impression from anyone that has one on the value of changing over.

thanks!


i think that there are subtle differences between the various opamps i've rolled, but not night and day. it's all subjective - your HPs and priorities may be different. i'm not a fan of the OPA627 in the M3, but would recommend you try it. it's a bit too limp and laid-back for me. the AD8610 has a very "neutral" sound that i like, but slightly prefer the AD843 for it's more energetic sound, having a forward mid-range and mid-bass "bounce".

i would also consider playing around with the bias a bit, provided you have apropos heat sinking and ventilation. i really like a bias of 160mA with the AKG K702, but it's far too much bass and warmth with the Denon D2000 and Fostex T50RP. i personally wouldn't go any higher with a 25VA transformer. right now i've settled on a bias of 100mA since the K702 aren't getting much love these days.
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