The Xonar Essence STX Q/A, tweaking, impressions thread
Sep 19, 2014 at 2:00 PM Post #4,910 of 5,721
Looks impressive... Would really like to hear more people tell of their own subjective experiences with the changes in the sound quality. 
I have a Sound Blaster ZXR and want to mod it, but it is so difficult to choose op-amps. Especially when there's 4 of them. I still don't understand why some people put different kind of op-amps into different slots... Why not just put the best/favorite into all four slots...
 
Oct 1, 2014 at 8:55 AM Post #4,911 of 5,721
Hi there
 
I recently purchased some LME49990 op amps, similar to these:
http://www.ebay.com.au/itm/320863638478?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
 
However, when ever they are in, the sound is extremely low.  I am 99.99% sure this is not caused by any settings on the computer, as i can put the stock op amps back in without changing a thing and the sound level becomes normal again.
 
I was hoping someone could give me some suggestions about why this is happening?  Is there some kind of extra trick to installing them?  Could they be dead or broken?  I find this hard to believe since i can hear sound (albeit barely).
 
Any help would be much appreciated.
 
Oct 4, 2014 at 2:14 PM Post #4,913 of 5,721
  Need a confirmation, Is the ST/STX still the king in computer audio or not?

 
ST/STX is as good, audio quality wise, as any other main steam sound card.
Technically the SB-ZxR has a slightly better line-output.
 
Oct 5, 2014 at 1:10 PM Post #4,916 of 5,721
Hi,
anybody know of any difference between the authentic MUSES1/MUSES2 ones and the fake ones?
Do they sound soundwise the same as the originals I mean not build quality wise ..
 
Are the fake ones even of NJR MUSES identical type or are they relabeled and disguised as other OPAMPS inside like some LME,NJM;HA Opamps instead?
 
What are the risks using fake Opamps? Can they damage the equipment?
 
I ordered some MUSES02 MUSES01 a week ago but only just noticed that they are retailing at higher prices on other sites.
I think they might be fake ones bc of the price.
 
I ordered them for the  ASUS Xonar Essence ST soundcard are there any OPAMP recommendations for this card?
And what to use as buffers? Some recommend the MUSES with the HA-5002 some say the OPA1611+LME49600 is the better combo.
 
Where should I insert the MUSES2 on the soundcard? Switch the LM4562NA with the MUSES?

 
Oct 5, 2014 at 2:50 PM Post #4,918 of 5,721
Whats the best Opamp combination out there?
 
Can someone explain me what I/V means? And what does Buffer mean?
 
Can I put for example a LME49720 in the buffer zone and I/V zone ?
 
Whats the difference between a J-FET and BI-Polar OPAMP?
 
Oct 6, 2014 at 11:18 AM Post #4,920 of 5,721
  Whats the best Op-amp combination out there?
Can someone explain me what I/V means? And what does Buffer mean?
Can I put for example a LME49720 in the buffer zone and I/V zone ?
Whats the difference between a J-FET and BI-Polar OPAMP?

 
I use AD797BR op-amps ($17.99 each) in my Essence STX and I do like them.
It's cost me $54 for three AD797BR (soldered) op-amps for my STX.
http://www.ebay.com/itm/mod-1x-AD797BR-Dual-to-Mono-Op-amp-module-ultralow-noise-replace-a-dual-op-/261266640288?pt=LH_DefaultDomain_0&hash=item3cd4b48da0
The Essence ST (& STX) uses the 2 I/V slots for the headphone output, the line-output (RCAs) use all three op-amps (I/V & buffer)
The LM4652 op-amp used in the buffer is the same as the LME49720.
Replacing the the two JMC2114 op-amps in the I/V slots with LME49720 is very common
 
The LME49990 ($14.99 each) is a well liked op-amp for the Essence ST/STX
http://www.ebay.com/itm/DUAL-SOIC-LME49990-DIP8-ADAPTER-/201176398615?pt=US_Amplifier_Parts_Components&hash=item2ed70c3b17
 
The op-amps slots on the STX/ST are dual channel (DIP-8) and the AD797BR and LME49990 are single channel (SOIC) op-amps.
So two SOIC op-amps need to be soldered on to an adapter, for them to work with the DIP-8 slots on the ST/STX sound cards.
 

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