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post #4336 of 4945
Quote:
Originally Posted by howzz1854 View Post

can some of you make a recommendation on what OPamp to try out next. 

 

i ordered a pair of LME49720 and i wasn't quite impressed. it killed the bass. 

 

i am listening through HD598, which is what i consider bass neutral.

 

what i look for MOST is soundstage, and bass second. so if there is one opamp out there with great soundstage but doesn't sacrafice bass, or improves on it, i'd love to give it a shot.  thoughts would be deeply appreciated. :)

I don't think the HD598 sounds that great with a bigger soundstage setting, instrument just feels too far apart and can't simulate it properly.

Like when you listen to rock, the violin feels like it 5metres to your right and the guitars etc feels like its 2-3meters to the left but it's really dependent on the recording.

post #4337 of 4945
Quote:
Originally Posted by Magiv9 View Post

I don't think the HD598 sounds that great with a bigger soundstage setting, instrument just feels too far apart and can't simulate it properly.

Like when you listen to rock, the violin feels like it 5metres to your right and the guitars etc feels like its 2-3meters to the left but it's really dependent on the recording.

i beg to differ. i particularly enjoy the wide and accurate soundstage of HD598 and would want more. sounds like you and me just have different taste. :)

 

still if anyone could think of a opamp that'll have better soundstage and bass than stock, please let me know. :)

post #4338 of 4945

howzz1854 , for extra soundstage space i would strongly advise you to try front panel out with those 49720 you got!

post #4339 of 4945
Quote:
Originally Posted by Redshift Rider View Post

howzz1854 , for extra soundstage space i would strongly advise you to try front panel out with those 49720 you got!

interesting suggestion ont the front out. but those 49720 kills bass. hence i was wondering if there's another opamp out there, other than stock that'll have better soundstage and better/equal bass. 

post #4340 of 4945

Well, unlike soundstage you can EQ bass when needed :D

post #4341 of 4945

Can someone please tell me if the Xonar STX will be OK with IEM's?

post #4342 of 4945

It depends on what IEMs you have. There may be some issues because of the output impedance, and hiss could be audible, especially at 44.1/88.2/176.4 kHz sample rate.


Edited by stv014 - 5/15/13 at 6:56am
post #4343 of 4945

I know the output impedance is not ideal but will it still be pretty good with my IEM's?

 

IEM's sound terrible out of my NAD amp which has 60ohm impedance. Only other thing I have is my Sansa Clip+ which sounds decent with IEM but I want to use my computer. I guess the STX should be good but not optimal for IEM?

post #4344 of 4945
Quote:
Originally Posted by nicholars View Post
I guess the STX should be good but not optimal for IEM?

 

Yes, if its impedance dopes not vary much with frequency (it only does for some models), and it is not very sensitive.

post #4345 of 4945

Well the IEM's I have currently are the Sennheiser IE8 (16 ohm Sensitivity:125 dB) and Shure SE215 (20 ohm Sensitivity (1 kHz): 107 dB SPL/mW)

 

I know it should be 8-10x the impedance of the output jack but I cannot find any sound cards (non professional) with a low impedance (1-3ohm) .... I guess the STX should be pretty good and an improvement on my NAD 326Bee (68 ohm) jack though? Would be better to have a 1-2ohm headphone amp I am sure but I would like a soundcard with RCA and SPDIF out as well as headphone amplifier...

 

Would be good if someone who has used the Xonar ST/STX with IEM's or IE8/SE215 could tell me if it the headphone amp with IEM's is decent enough to last me until I can get an external amplifier.


Edited by nicholars - 5/15/13 at 8:06am
post #4346 of 4945

I got my 49990 op amps in.  Does it matter which direction they are installed? 

post #4347 of 4945

Nevermind...I had them in backwards because all I heard was a weird hum.  I replaced the stock headphone op amps and am running only the rca out, and considering that my speakers are not the best it sounds great!  Is it just me or do these have more bass than the stock?  The chip is HOT.  Someone was concerned about swapping 3 op amps might get to hot...but if I go ahead and install the headphone op amps also...wouldn't it only use one or the other depending on what output i'm using?

 

Thanks guys for the 49990 recommendation!  beyersmile.png

post #4348 of 4945
Quote:
Originally Posted by gr4474 View Post

I got my 49990 op amps in.  Does it matter which direction they are installed? 

 



Yes, it's VERY important as you would connect the wrong pin to the wrong jack if you don't place it right. On the original OP:s there is a small round mark on each OP indicating which pin is number 1, they are all numbered from 1-8. The number 1 pin should be placed so it points towards the back panel of the card, that is the original placement. Take a look for yourself before you do anything. There's no difference with 49990, the number 1 pin should be placed identically, and it is marked with a small digit "1" on that miniature PCB if I remember right, so you really can't go wrong.

post #4349 of 4945
Quote:
Originally Posted by gr4474 View Post

Nevermind...I had them in backwards because all I heard was a weird hum.  I replaced the stock headphone op amps and am running only the rca out, and considering that my speakers are not the best it sounds great!  Is it just me or do these have more bass than the stock?  The chip is HOT.  Someone was concerned about swapping 3 op amps might get to hot...but if I go ahead and install the headphone op amps also...wouldn't it only use one or the other depending on what output i'm using?

 

Thanks guys for the 49990 recommendation!  beyersmile.png

 

You found out the hard way  beyersmile.png  Yes, the bass is more punchy, I don't think it is more in quantity it is just cleaner and faster.  About the heat, I don't know, It's hard to predict what will happen but generally it's a risk factor. You're free to try it and report back for the benefit of others, at your own risk of course!  smile.gif

post #4350 of 4945
Quote:
Originally Posted by howzz1854 View Post

interesting suggestion ont the front out. but those 49720 kills bass. hence i was wondering if there's another opamp out there, other than stock that'll have better soundstage and better/equal bass. 

 

The opamp does not kill bass. The output of the sound card with said opamp will still be measurably flat. What changes is the extraction of finer detail & dynamics. As both improve the bass becomes firmer & retains more of the impression of the dynamics which means the higher frequency component of the attack is better reproduced. This sound is in fact closer to the reality that happened in the recording studio, not the reverse. It is the better delineation of the higher frequency components in the attack that  give the impression of reduced bass even though it will measure flat.

 

The same thing happens when you improve the power supply components as I have found yet my system is flat down to 20Hz. When deep bass occurs in music on my system it reproduces it very well but without undue emphasis as the bass is not reproduced at the expense of higher frequency components that are occurring at the same time.

 

By the way the LME49990 spec sheet calls for at least double power supply bypasses. The STX does not have the recommended bypasses stock so may not sound as intended if mounted to the STX & as such may actually have some emphasis in the bass as a result of less well delineated high frequencies compared to if the proper bypassed were present on the STX card 


Edited by germanium - 5/15/13 at 9:29pm
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