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OP amp help

post #1 of 8
Thread Starter 
I own a Xonar DS and I'm looking to upgrade the OP amp. I'm looking at the LM4562NA-ND atm, and my headphones are Audio Technica ATH M50. I'm having trouble finding any information on how many OP amps I need, I googled the crap out of "how many opamps for xonar ds, xonar ds opamp upgrade" etc., but I have found nothing on how many I need. Anyone know how many I should buy? And I plan on ordering from digikey unless someone else has a better suggestion, I read some ebay stories on fake op amps so I'm sort of scared to order from them.

Also, if you have suggestions on other OP amps to try out, I'm all ears. I mainly listen to electronica, a little rock(heavy and light), and a bunch of classical when I'm studying/working.

Edit: Well the back of the box says swappable OP amp with no s so I'm guessing one. Still open to suggestions on what kind though.
Edited by Chocosuke - 1/16/12 at 12:53am
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post #2 of 8
There's only one opamp you can change. It's a DIP8 form factor with two opamps in one package.

A popular choice for the STX and the Titanium HD is the LME49720NA. That should work in your case as well.

To be honest, changing the opamp doesn't change things as much as people make it out to be. It's like changing a cable on a $400 headphone. The differences might be there but you probably couldn't tell me exactly what changed unless you did an A/B.
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post #3 of 8
Quote:
Originally Posted by RallyMaster View Post

There's only one opamp you can change. It's a DIP8 form factor with two opamps in one package.

A popular choice for the STX and the Titanium HD is the LME49720NA. That should work in your case as well.

To be honest, changing the opamp doesn't change things as much as people make it out to be. It's like changing a cable on a $400 headphone. The differences might be there but you probably couldn't tell me exactly what changed unless you did an A/B.

Clarity and congestion mostly changes with cables. Pretty noticeable on HD558 and 598s.
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post #4 of 8
Thread Starter 
I see. From what I read on Head-Fi it seemed like people could make out an audible difference, and it's cheap so why not. Will look into your suggestion some more as well. Thanks.
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post #5 of 8
The thing with opamps they just mostly change the sound signature of the device. The difference in SQ is very subtle if any.
    
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post #6 of 8
Thread Starter 
The OP amps came in today. I don't know if I can tell the difference, so I'll just pretend I do, and that it was money well spent lol. Thanks for the information.
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post #7 of 8
Quote:
Originally Posted by RallyMaster View Post

There's only one opamp you can change. It's a DIP8 form factor with two opamps in one package.
A popular choice for the STX and the Titanium HD is the LME49720NA. That should work in your case as well.
To be honest, changing the opamp doesn't change things as much as people make it out to be. It's like changing a cable on a $400 headphone. The differences might be there but you probably couldn't tell me exactly what changed unless you did an A/B.

I disagree, I been rolling op-amps for a very long time and actively. I can easy tell the difference between each op-amp I slot in and out. Those that active do it will also disagree with you as well. You cant compare over price headphone cables to op-amps. Unlike the cables, OP-amps do change the sound signature. Different op-amps have different sound signature. When you combine Op-amps with another set of op-amps you get the best of both op-amps.

Only some one who either never rolled op-amps would say there hardly any difference between each op-amp or in general. Or some one who tried a limited amount of op-amps that had near the same sound signature. Also the people on head-fi that also roll op-amps are not hearing any placebo or any so called pretend sound.

LME49860NA, LT1364CN8,LT1057ACN8,OPA2111KP,OPA2107AP, are also good choices for op-amps as well. they are also Dual channel op-amps and are also Dip-8. They are other good choices too but those req you know how to use tools, As some of these other choices are either in Soic or are TO-99 format which req either Soic to Dip-8 adapters, To-99 to Dip-8 adapters. Or Dual Soic/To-99 to Single Dip-8 adapters.


@op One important information. Make sure the op-amp notch is facing the same direction as the notch on the op-amp socket. Both op-amp and socket notch should be pointing the same way.
Edited by admflameberg - 1/23/12 at 4:52pm
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post #8 of 8
For a systematic and technical perspective (with measurements and not just blather) on op amp rolling for one particular circuit, see here:

http://nwavguy.blogspot.com/2011/08/op-amp-measurements.html

Certainly there are plenty of op amps that are wholly unsuitable and would do terribly, but once you're talking about high-performance audio op amps...generally nothing too much there to see in terms of differences, unless you end up with a less stable op amp that starts oscillating because the circuit was never intended for that part. Actually that's a somewhat common scenario, particularly if you swap to parts that are relatively expensive / high-performing when done right / finicky.

Granted, another circuit other than the one investigated in the above link, may be more sensitive to which op amps are used.

Consumers tend to have an op amp and tube-centric view of audio quality, whereas in reality the overall design and topology have a lot more to do with performance than which model number parts are used. Well, this is a little less of the case in many tube amp implementations, many of which run single-ended, maybe with limited or no feedback anywhere, and many without an output transformer. In your typical sound card, you shouldn't expect as much sensitivity there because the designs are more by the books.
Edited by mikeaj - 1/23/12 at 6:10pm
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