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ad8620 vs opa627 vs. opa637 vs. lm4562

post #1 of 9
Thread Starter 
Well, I'm looking at opamp options for my X-fi Prelude since ther front opamp is easily upgradeable and I've read up about these and have come to the following conclusions:

*The AD8620AR is near the same as the AD8620BR and less expensive.

I've read about the 'Sondigo vs. X-fi Prelude' comparison a few threads down and I basically concluded from that the AD8620 might be considered better than the default LM4562. That said, a few people consder the OPA637 an 'upgrade' from the AD8620.

Also comparisons of the OPA627 and OPA637 would be good.
Help!
post #2 of 9
Kiwi,

I've used both AD8620 and the OPA627/37, and currently have the AD8620 in my EMU0404. The AD8620 is definietly my favorite of all of the above mentioned. I also swapped OPA627/37 and the AD8610 in my headamp, however i could tell little to no difference. I currently have the AD8610 still in there.

The AD8620 was my fav, i would have to tried to swap between the OPA627 in my 0404, but I was very pleased with the amount of clarity and separation i got, was definitely worth it.

-dan
post #3 of 9
opa637 is only stable at gains of 5 or greater. If you don't know what the gain configuration is in the circuit you're sticking it in, use the 627 instead.

ad8620 is for sure a nice chip. in my m3 amp i prefer the 627/637 to the 8610, but, the 86x0 chips sound more 'thin' or 'spidery' the more you crank up the power supply voltage. near their maximum of 24 volts, they're not very much fun. Probably better at lower voltages.

I like the lm4562 a lot in some jobs but watch out for dc offset
post #4 of 9
Not familiar with this card but if it's using duals, are people stuffing 2x singles via browndogs on top of the sockets??

I'd be more tempted to try simple resistor class A biasing and a small poly between the supply rails.

Here's some links for the OP:
http://www.head-fi.org/forums/f46/x-...5/#post4496925
http://www.head-fi.org/forums/f46/be...4/#post3450796
post #5 of 9
Thread Starter 
Quote:
Originally Posted by 1UP View Post
Not familiar with this card but if it's using duals, are people stuffing 2x singles via browndogs on top of the sockets??

I'd be more tempted to try simple resistor class A biasing and a small poly between the supply rails.

Here's some links for the OP:
http://www.head-fi.org/forums/f46/x-...5/#post4496925
http://www.head-fi.org/forums/f46/be...4/#post3450796
Yeah I can use the search feature and Google too
post #6 of 9
Thread Starter 
Anyway, I was just wondering, would there be any voltage or other issues if I get the AD8620AR over the AD8620BR?
post #7 of 9
Well search the answer for that one, too, then!

BTW, with all these datasheet AKM implementations, if you're gonna stick using the existing circuit, the most important thing to mod is really those dc blocking caps on the DAC output.
post #8 of 9
Thread Starter 
I'll bump this as I have another important question I should of asked first but hey....

Since I listen to music in bit-perfect, is there any point in changing the opamp?

If it does make a difference, I'm more leaning towards the AD8066 but I'm not too sure whether it is fully 'compatible' with the X-fi Prelude, could someone inform me if they are or not?

And well, any places you can buy it and it ships overseas?

Also would I needed a DIP-8 adapter? Edit: Answered my own question here that being YES.

*Yay for IT school starting as an electronics school, I'm sure that the electronics teacher could install the opamp safely for me *
post #9 of 9
I have used all those opamps they are all great. The LM4562 is a nice opamp and won alot of awards when it was released for the performance to price it is good. The AD8620,627,637 are in a different league then the 4562.

The AD8620BR, is a very nice opamp and you should be very pleased with it. I like the 627s but prefer the OPA637 for my own system. All are great opamps and it just boils down to preference for the sound signature of what you hear. Some like the 8620 over the 627. Some like the 637 over the 627 etc.
As for your other questions if your using analog then sapping out opamps can improve the sound. Individual setting on the card don't matter. If you swicth out to using digital output from the card then the opamps don't matter in the slightest.

Be careful, opamps get to be a bit of a habit/addiction and before you know it have a large collection. Tread carfully!
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