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The Xonar Essence STX Q/A, tweaking, impressions thread
Sep 8, 2012 at 7:08 AM Post #3,631 of 5,721
Quote:
kjeldsen said:
Hey guys,
 
Loving this thread! I decided to get some new opamps for my ST card and found a place where i can order some, but i'm getting multiple hits with different specs on some of the parts.
 
I.e. I'm looking at a 2x LME49720NA and LM6172IN combo. With respect to LME49720NA  i'm getting two hits at Farnells site. Can someone tell me which one is the "right" one or if they are the same?
 
http://uk.farnell.com/national-semiconductor/lme49720na-nopb/op-amp-audio-17vin-55mhz-8dip/dp/2102668
http://uk.farnell.com/national-semiconductor/lme49720na-nopb/ic-audio-op-amp-55mhz-dip-8/dp/1694587
 
Cheers!
Martin
Click to expand...

I have that same combo, but I decided not to buy from that shop as I had the same problem as you. I purchased mine from the NooElec ebay shop. http://myworld.ebay.com/nooelec/&_trksid=p3984.m1439.l2754
 
They ship really fast and have great customer service.
 
Sep 8, 2012 at 7:39 AM Post #3,632 of 5,721
After a long time I finally got to install the STX into my rig with 3 sets of LME49990MA op amps.
But the sound output is strange.
The left channel is barely heard while the right channel is overpowering.
Confirmed this on both headphone out and RCA out.
I also tried both Unified Xonar drivers and the official drivers from Asus but the problem persists.
 
Anyone knows what's happening?
 
Sep 8, 2012 at 7:56 AM Post #3,633 of 5,721
Sep 8, 2012 at 8:21 AM Post #3,634 of 5,721
 
Sep 8, 2012 at 8:29 AM Post #3,635 of 5,721
Quote:
kjeldsen said:
 
Believe it or not, but i'm having the same problem again, even at that Ebay shop : ) 
 
http://www.ebay.com/itm/LME49720NA-Dual-OpAmp-Audiophile-AUTHENTIC-LME49720-DIP-/160536400278?pt=LH_DefaultDomain_2&hash=item2560b71196#ht_2477wt_906
 
http://www.ebay.com/itm/LME49860NA-Dual-Low-Noise-Audio-OpAmp-AUTHENTIC-LME49860N-LME49860-DIP-8-USA-/160704162578?pt=LH_DefaultDomain_0&hash=item256ab6eb12#ht_2837wt_1163
 
Which one did you get? 
Click to expand...

I got this one. http://www.ebay.com/itm/2x-LME49720NA-Dual-HiFi-OpAmp-AUTHENTIC-LME49720-DIP-/160582575653?pt=LH_DefaultDomain_2&hash=item256377a625#ht_2477wt_906
 
It's a kit of 2.
 
And then this for the buffer: http://www.ebay.com/itm/LM6172IN-Dual-Voltage-Feedback-OpAmp-LM6172-DIP-Op-Amp-/150552966865?pt=LH_DefaultDomain_2&hash=item230da7f6d1#ht_2518wt_1163
 
It's a really good combo and great upgrade for a soundcard.
 
Sep 8, 2012 at 8:30 AM Post #3,636 of 5,721
Quote:
harryyeo said:
After a long time I finally got to install the STX into my rig with 3 sets of LME49990MA op amps.
But the sound output is strange.
The left channel is barely heard while the right channel is overpowering.
Confirmed this on both headphone out and RCA out.
I also tried both Unified Xonar drivers and the official drivers from Asus but the problem persists.
 
Anyone knows what's happening?
Click to expand...

Have you tried the mixer tab in the Xonar Audio Center? There is a channel mixer there.
 
Sep 8, 2012 at 8:39 AM Post #3,637 of 5,721
 
Sep 8, 2012 at 5:10 PM Post #3,638 of 5,721
Sep 8, 2012 at 8:23 PM Post #3,639 of 5,721
Quote:
damageinc77 said:
I got this one. http://www.ebay.com/itm/2x-LME49720NA-Dual-HiFi-OpAmp-AUTHENTIC-LME49720-DIP-/160582575653?pt=LH_DefaultDomain_2&hash=item256377a625#ht_2477wt_906
 
It's a kit of 2.
 
And then this for the buffer: http://www.ebay.com/itm/LM6172IN-Dual-Voltage-Feedback-OpAmp-LM6172-DIP-Op-Amp-/150552966865?pt=LH_DefaultDomain_2&hash=item230da7f6d1#ht_2518wt_1163
 
It's a really good combo and great upgrade for a soundcard.
Click to expand...


I've actually been wondering about this combo myself. I find the bass quantity and quality to be perfect with the stock opamps, so I don't want to sacrifice that, but I'd like more depth/sound stage. I've heard that the LME49720 are a great choice for the sound stage, but reduce the bass extension a bit.

In other words What would be the best opamp combo for increasing depth without affecting the bass?
 
Sep 8, 2012 at 11:25 PM Post #3,640 of 5,721
Quote:
kjeldsen said:
Hey guys,
 
Loving this thread! I decided to get some new opamps for my ST card and found a place where i can order some, but i'm getting multiple hits with different specs on some of the parts.
 
I.e. I'm looking at a 2x LME49720NA and LM6172IN combo. With respect to LME49720NA  i'm getting two hits at Farnells site. Can someone tell me which one is the "right" one or if they are the same?
 
http://uk.farnell.com/national-semiconductor/lme49720na-nopb/op-amp-audio-17vin-55mhz-8dip/dp/2102668
http://uk.farnell.com/national-semiconductor/lme49720na-nopb/ic-audio-op-amp-55mhz-dip-8/dp/1694587
 
Cheers!
Martin
Click to expand...


The National Semiconductor® LM6172IN is not intended for device loads typical of audio usage, unlike the LME49720NA, which is rated for a 600Ω load; I'd therefore limit use of the LM6172IN to the I-V position.  I'm researching improved IC's for my own XONAR® STX and plan on either the LME49860NA or (provided they and the required DIP8 adapter can fit the height limitation imposed by the RF shield) dual LME49990MA's for the Buffer; the LME49860NA has a wider safe range for power supply than the LME49720NA but will run as consistently.
 
Sep 9, 2012 at 3:38 PM Post #3,642 of 5,721
After putting in OPA2137 into the I/V my RCA out to my speakers is starting to get some distortion. Anyone help with this one? 
 
I'll try to do some experimenting later to see if I can find a software reason. 
 
Sep 9, 2012 at 3:42 PM Post #3,643 of 5,721
Quote:
bcschmerker4 said:
The National Semiconductor® LM6172IN is not intended for device loads typical of audio usage, unlike the LME49720NA, which is rated for a 600Ω load; I'd therefore limit use of the LM6172IN to the I-V position.  I'm researching improved IC's for my own XONAR® STX and plan on either the LME49860NA or (provided they and the required DIP8 adapter can fit the height limitation imposed by the RF shield) dual LME49990MA's for the Buffer; the LME49860NA has a wider safe range for power supply than the LME49720NA but will run as consistently.
Click to expand...

 
Thanks for the tip! Basically i went with that combo because of what i read in the Q/A section on opamps. Has anyone actually had trouble using the LM6172IN in the buffer slot? Maybe i'm getting things mixed up, but i thought there was only a single buffer slot? You mention using dual LME49990MA's. 
 
Cheers.
 
Sep 9, 2012 at 4:33 PM Post #3,644 of 5,721
Quote:
kjeldsen said:
 
Thanks for the tip! Basically i went with that combo because of what i read in the Q/A section on opamps. Has anyone actually had trouble using the LM6172IN in the buffer slot? Maybe i'm getting things mixed up, but i thought there was only a single buffer slot? You mention using dual LME49990MA's. 
 
Cheers.
Click to expand...

I am using the LM6172IN in the buffer and so are many other people, with absolutely no problems. You have nothing to worry about.
 
And it doesn't really matter anyway if you are only using the Headphone out. It's only the RCA that uses the buffer.
 
Sep 9, 2012 at 6:13 PM Post #3,645 of 5,721
Quote:
damageinc77 said:
I am using the LM6172IN in the buffer and so are many other people, with absolutely no problems. You have nothing to worry about.
 
And it doesn't really matter anyway if you are only using the Headphone out. It's only the RCA that uses the buffer.
Click to expand...

 
Cool, thanks. For now i'll only be using the headphone out but i guess i'll be using the RCA when/if i move to a desktop amp.
 
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