Op amp observations - OPA2134, OPA627, AD8620

Posted by strictlyamateur (A) on April 5, 2006 at 09:19:40

It seems every time I make a tweak or two to my system, I find myself switching out op amps in my Marantz CC4300 CDP, and now that I've pretty much upgraded everything in the Marantz and my Jolida 102, I'm noticing some things about op amps that I haven't in the past.

In a nutshell:

OPA2134 has wonderful highs, very full and easy on the ears, but has a thin midrange that sounds off to me.

OPA627 has a wonderful midrange, but the highs can seem a little thin and shrill at times.

AD op amps in general seem more balanced to me, but lack the best qualities of the OPAs. AD8620 is my favorite of the ADs, a free-flowing op amp with a solid midrange, but it seems a little veiled to me and the highs somewhat rolled off. Still, it's the one I'm sticking with for now. After I switch my Jolida coupling caps to PIOs in the next couple of weeks, I'll try the OPA627 again.

To my ears, AD8620 and OPA627 are by far the best op amps I've heard. My system seems to have one or the other in it all the time; every other one I've tried hasn't lasted long.

Hope this is of some use to someone...

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Topic - Op amp observations - OPA2134, OPA627, AD8620 - strictlyamateur 09:19:40 04/05/06 (21)

bias the opa 627 into class A - Vynuhl.Addict 23:07:42 04/06/06 (11)

WOW! - strictlyamateur 09:40:26 04/09/06 (4)

slight edginess is gone from vocals?? - Vynuhl.Addict 19:30:38 04/09/06 (3)

Re: We're way beyond that :-) - strictlyamateur 14:53:20 04/10/06 (2)

Ishould try the ad8620 again.. - Vynuhl.Addict 16:38:56 04/10/06 (1)

Re: I should try the ad8620 again.. - strictlyamateur 18:43:51 04/10/06 (0)

AD8620 into class A? - strictlyamateur 06:30:54 04/07/06 (4)

Re: AD8620 in class A - also great - strictlyamateur 19:08:01 04/09/06 (0)

Dual op amp class A bias - strictlyamateur 09:14:48 04/07/06 (2)

pin 4 to 7 and 4 to 1 for a dual... - Vynuhl.Addict 00:54:49 04/08/06 (1)

Thank you all - lots of good stuff (NT) - strictlyamateur 16:10:54 04/08/06 (0)

Re: bias the opa 627 into class A - strictlyamateur 06:16:40 04/07/06 (0)

Your observations are true . . . - markrohr 12:11:33 04/05/06 (0)

Re: Op amp observations - OPA2134, OPA627, AD8620 - DaveT 11:46:39 04/05/06 (0)

Re: Op amp observations - OPA2134, OPA627, AD8620 - pkell44 10:32:23 04/05/06 (6)

Re: servo output link? - strictlyamateur 10:51:00 04/05/06 (5)

NO! - nightdoggy 14:20:43 04/07/06 (2)

Yes and No - Slider 10:10:13 04/09/06 (1)

I would agree with that - nightdoggy 14:28:49 04/09/06 (0)

Re: servo output link? - pkell44 11:29:54 04/06/06 (1)

Re: servo output link? - Werner 23:37:31 04/06/06 (0)

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