The best sounding audio integrated opamps

[Andrea:]

Gain of +1 is commonly referred to as "unity gain".

Yesss...use the LT1128 as the output opamp.

[amparoytoni]

Originally Posted by amparoytoni

I want to put a headphones amplifier in to a cd player,

the 30mA of the opa1611 isn´t sufficient to move directly a headphones?

Which buffer, will be adecuate to that o_amp.?

What about the lt1010 or buf634?

[leeperry]

one thing I fail to understand is that 2*LT1028AC used to work fine as final buffer...and now either they give a very loud shredding noise or a lot of hiss on the left channel...hummm, did I fry the chips somehow??

I can get some LT1128ACN8 for rather cheap on ebay, 8 EUR a pop including shipping..

ah well, LT1363 is a good guy too..SQ is very good! I'm sick and tired of rolling anyway

[Andrea:]

Originally Posted by amparoytoni

I want to put a headphones amplifier in to a cd player,

the 30mA of the opa1611 isn´t sufficient to move directly a headphones?

Which buffer, will be adecuate to that o_amp.?

Yes, it is! It drove my HD238 (32 ohm) just as well as the AD845KN. But you must pay a little attention to its input current...the AD845 being more likely to fit well in a given circuit.

[Andrea:]

Originally Posted by leeperry

I can get some LT1128ACN8 for rather cheap on ebay, 8 EUR a pop including shipping..

That's a good bet and would counterbalance the LT1363's relative brightness well.

[leeperry]

yes, I'll look into my options...but IME adding a final buffer always kills the SS of the opamps that are used on the AK4396 output...it will color it to death.

right now I've got a mind blowing SS, OKish trebles, great mids and OK-ish bass response(the AD797B was definitely more bass shy)...sound is actually very balanced.

I could add some op-amps as final buffer, it will give far more bass....but also shrink down and color the SS from the DAC output, this I'm not sure I want.

and I will compare 4*LT1363 to 2*LT1364 to make sure that the much wider center channel is not the fruit of my imagination

I'll also try 6*LT1363, but from what I've heard so far LT1363 doesn't sound too good as final buffer...ppl seem to prefer 2*1364 and 1*1361, I'm expecting some 1360

and tbh, the hiss/loud screaming noises from the LT1028 have kinda scared me...I really don't wanna screw up my beloved headphones

[Andrea:]

Adding one more, complementary-sounding opamp stage (such as with LT1363 and LT1128, which are rather complementary both color wise and balance wise) can only help to balance the sound presentation, and will never "color" it. Provided you don't just choose some trash chip

And in your case the output opamp seems pretty much necessary as it's the one that converts the balanced output of the DAC into single ended...

[amparoytoni]

Which is the typ. impedance to load a rca audio dvd output?
I want not to affect the source. (Vrms 0.38)

[leeperry]

Originally Posted by Andrea:

Adding one more, complementary-sounding opamp stage (such as with LT1363 and LT1128, which are rather complementary both color wise and balance wise) can only help to balance the sound presentation, and will never "color" it. Provided you don't just choose some trash chip

And in your case the output opamp seems pretty much necessary as it's the one that converts the balanced output of the DAC into single ended...

it will kill the SS for sure, even the 1028 was...but well, it was prolly oscillating to death when it was still working

anyway, bass is great(LT1363/4 sure are bass nodders)...I just bought a Griffin Powermate btw, very cool stuff, I love it!

getting a proper analog pot is a PITA, as it requires steps to be accurate and I hate steps: High Precision Volume Control (HPVC)

and LT1363 just has an amazing SS, far more natural than AD797B I would say...when I watch a cartoon, I can picture the dubbing actors recording in the studio...it seems to capture the original room reverb so accurately! if hell doesn't break loose anytime soon, those four LT1363CN8 will stay there for a while

[Andrea:]

Originally Posted by amparoytoni

Which is the typ. impedance to load a rca audio dvd output?
I want not to affect the source. (Vrms 0.38)

Something between 10K - 50K, most typically 47K.