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Item#: N82E16829132010

ASUS Xonar Essence STX Virtual 7.1 Channels 24-bit 192KHz PCI Express x1 Interface 124 dB SNR / Headphone AMP Card

  • PCI Express x1 7.1 Channels
  • 124dB SNR Rating
  • Built in Headphone Amp
  • 3.5mm and 6.3mm Headphone Compatibility
This product qualifies for the Iron Egg guarantee. We'll match any qualifying competitor's price.
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The ASUS Xonar Essence STX is a PCI-e audio card that is designed for the music enthusiast. Equipping the Xonar Essence STX with the best components and the finest design, the STX delivers a top-of-the-line audio experience with a 124 dB SNR rating. With a built-in headphone amp that can power headphones up to 600 ohms and 6.3 mm headphone jacks, the STX makes a perfect pair with high-end headphones.

  • newegg High Signal-to-Noise Ratio (SNR) A high SNR rating means less unwanted noise. Therefore the audio is cleaner which translates to better sound quality. The Xonar STX is the world’s first sound card to achieve a 124 dB SNR rating for crystal clear audio.
  • newegg Built-in Headphone Amp A high-quality TI TPA6120A2 headphone amp supports headphones up to 600 ohms of impedance with lower than 0.001% distortion. This allows users to drive their headphones as intended without additional amplification.
  • newegg EMI Shield EMI shielding seals the RCA/headphone signals from noise and offers distortion-free audio.
  • newegg Nichicon “Fine Gold” Professional Audio Capacitors Using state-of-the-art etching technology, Nichicon “Fine Gold” capacitors deliver rich bass and crystal clear high frequencies.
  • newegg 6.3 mm Headphone and Mic Jacks The 6.3 mm headphone jacks offers compatibility with high-end headphones. An adapter is included for the usage of headphones with 3.5 mm connectors.
  • newegg Upgradeable Op-amp The Xonar Essence STX can be upgraded with the Xonar Op-amp Upgrade Kit for a blend of natural sound and enhanced quality.

Learn more about the ASUS Xonar Essence STX


Xonar Essence STX

Audio core

Audio Chipset
Virtual 7.1
Sample Rate
Digital Audio
118 dB Input Signal-to-Noise Ratio
124 dB for Front-out
110 dB for Headphone-out


Line In
High-bandwidth Coaxial/TOS-Link combo port supports 192KHz/24bit
1 x 6.3mm Jack (Shared by Line-In/Mic-In)
CD/Aux In
Aux-In (4-pin header on the card)
Other Ports
Analog Output Jack:
RCA jack *2 (Front R / Front L), 6.30mm jack*1 (Headphone out)

Front-Panel Header:
Shared by Headphone out / 2 channels out / Microphone in

S/PDIF Header:
Connects to compatiable graphic cards for HDMI output


PCI Express x1
Operating Systems Supported
Windows Vista/XP(32/64bit)/MCE2005


Dolby Digital Live: Dolby Digital Live encodes any audio signal on PC in real-time to Dolby Digital (AC3) 5.1 surround sounds to your home theater environment through one single S/PDIF connection

Dolby Headphone: Dolby Headphone technology allows users to listen to music, watch movies, or play games with the dramatic 5.1-channel surround or realistic 3D spacious effects through any set of stereo headphones.

Dolby Virtual Speaker: Dolby Virtual Speaker technology simulates a highly realistic 5.1-speaker surround sound listening environment from as few as two speakers.

Dolby Pro-Logic II: Dolby Pro-Logic II is the well-known technology to process any native stereo or 5.1-channel audio into up to 6.1 channel output, creating a seamless, natural surround soundfield.

Smart Volume Normalizer

Normalizes the volume of all audio sources into a constant level and also enhances your 3D sound listening range and advantages in gaming

Xear 3D Virtual Speaker Shifter:
Virtual 7.1 speaker positioning

Magic Voice:
Xonar Essence STX provides VocalFX, the latest vocal effect technologies for gaming and VoIP, including: -VoiceEX: produces vivid environmental reverberation for your voice in EAX games -ChatEX: emulates different background environment effects when you chat online -Magic Voice: changes your voice pitch to different types (Monster/Cartoon…) for disguising your real voice or just for fun in online chatting

Karaoke Functions:
Music Key-Shifting and Microphone Echo effects like professional Karaoke machine

Professional Bass Management/Enhancement system

3D Sound Engines/APIs:
Vista: DirectSound3D GX 2.5, DirectSound HW, DirectSound SW, A3D1.0, OpenAL generic modes, 128 3D sounds processing capability
XP: DirectSound2.5 SW, A3D1.0, OpenAL generic modes, 128 3D sounds processing capability

Manufacturer Warranty

3 years limited
3 years limited

Quick Info


  • Limited Warranty period (parts): 3 years
  • Limited Warranty period (labor): 3 years

Customer Reviews of the ASUS Xonar Essence STX

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  • DREW W.
  • 12/20/2014 11:23:11 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month

5 out of 5 eggsOutstanding card after you get it to work

Pros: This card is constructed very well and absolutely beautiful to look at. The sound quality puts every other sound card I've owned to shame, even with mid range speakers and headphones. The Audio Center software that is included allows you to customize the sound in just about every way imaginable.

Cons: Nothing that is a deal breaker, but a few issues I ran into while installing:

Installing the drivers was a little more complicated than it should have been. Go to the website for driver downloads if the included CD doesn't work for you.

Seems to be a common issue that a prompt saying "Sound card requires more power" pops up while installing drivers. If your connections are good hit ignore and continue.

I got no sound out even after ensuring Bios and playback device settings were correct. Go into the Xonar audio center and make your adjustments in there.

Other Thoughts: Other than the software hiccup this card is outstanding. I would definitely buy this card again for another build.

Did you find this review helpful? Yes No

  • Matt B.
  • 11/28/2014 6:13:06 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

2 out of 5 eggsGreat Card, but Very Incompatible

Pros: This card is a gem, it has the potential to provide a near studio quality experience. For the price it could be a great buy (see cons).

Cons: Where to begin...

This card has been an absolute nightmare to work with. After a lot of setup headache, I managed to get sound from it, but that sound was quiet (as if there was no supplemental power going into the card). It wasn't a power problem as the 4-pin molex connector was as tight as could be, and it also wasn't a driver issue as I have used both the newest drivers from ASUS and the 3rd party UNi Xonar drivers to test with. I RMA'd the card thinking it was defective (perhaps a transistor had burnt up), however after getting a new card I was facing the same problems.

After >10 hours of troubleshooting, reading over a dozen threads related to this problem, spending hundreds of reboot cycles and going through thousands of configurations, I have to say that this card is not worth the pain. I may have missed something stupid, but at this point I am just interested in a refund. Hopefully NewEgg will at least pay for the return shipping THIS time.

Other Thoughts: Like I said, this card is a gem, if you can get it to work. I think with my system it may be a compatibility issue, so I will leave my significant components so that someone else may get a better idea of whether or not the card will work for them.

Intel Core-i7 4930k @ ~4.4GHz



16 GB G.Skill Ripjaws X (4x4GB)

Zalman 1250W 80 Plus platinum (Fully Modular)
(>45A on the 12 volt rail)

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  • Brian T.
  • 10/31/2014 12:44:34 PM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsGood Buy

Pros: After reading lots of horror stories about getting this card to work I was hesitant about buying it.
Got it anyways and was prepared to do a bunch of legwork to get it to work, plugged it it, worked like a charm.
Awesome sound, no problems at all.

Running on a asus z97 pro

Cons: None. Works great so far.

1 out of 1 people found this review helpful. Did you? Yes No

  • Reginald B.
  • 9/9/2014 7:17:48 AM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggs

Pros: Great sound quality, no noise. Works excellently with my beyerdynamic DT990's 600ohm headphones. Works well with games and music.

Cons: A tad pricey. The software that comes with it is a bit buggy and likes to crash on boot, but it is fine after the software is restarted.

1 out of 1 people found this review helpful. Did you? Yes No

  • David E.
  • 9/4/2014 7:26:43 AM
  • Tech Level: Average
  • Ownership: more than 1 year

5 out of 5 eggsSound Blaster ZXR now practically copies this card

Pros: Sound blaster almost copies this card now which should say a lot about the card. I bought a second one, for another PC, I usually end up with more than one of anything I like. This card is hands down the best card you can buy and still is. I use Akg 701 headphone and they sound awesome. Way better than the phone out on my Yamaha RX-V1.

Rca Analogue outs are incredible. Sounds better than any CD player I have used or purchased. Digs down way deeper for bass extension, than anything I have ever used, so if you like to run subwoofer's this card is extra fun indeed.

I got a cheaper Soundblaster HD usb sound card. This Asus leaves it in the dust mostly for better bass output.

Cons: There are zero issues, unless your dumb enough not to check for updated drivers at Asus before you start. They ship with the same drivers for XP and Vista for years now.

2 out of 2 people found this review helpful. Did you? Yes No

  • Kellen B.
  • 8/8/2014 7:15:38 PM
  • Tech Level: Average
  • Ownership: 1 day to 1 week
  • Verified Owner

2 out of 5 eggsGreat card, Horrible installation guide.

Pros: The sound this card put out is amazing, I am very impressed with the engineering of this card. just not everything else.

Cons: The installation of this card is absolute nightmare. I followed the instruction to a T and still had major issues. Not so much with the hardware, but the software.
After installing the card is says a message should pop up on your desktop telling you that a new card has been installed. This does not happen! After inserting the installation disk when I tried to install the drive, it kept on saying "More power is required for this card." Even though the card was installed properly and had the power plunged into, it still would not let me install the software. After trying several times and different ports I kept on getting the same message. After hours of research on the internet about this card I found out a ton of people have had similar problems. In many cases people thought that they had received a bad card and they sent the card back. I finally found out that you have to go to the ASUS website and download the driver from there. This is not the first time I've experienced this issue with ASUS. I have purchased other hardware from them in the past and have had to get the drivers from there website. So in other words the installation disk is useless. If a company is selling a product and the instructions they are giving to there customer are useless, you shouldn't be selling the product.
This happens so often with hardware and in my opinion they just need to refer the customer to there website where updated instruction can be given. Otherwise you have to do all the research yourself. This would save time and money to both parties involved.
Also I am not really impressed with NewEgg. The product they sent me had been open before, the factory seal was cut, and it look as though the card was handle before. For all I know somebody else might of tried to installed this disk before. I would have gotten a RMA for it, but the hassle of that with NewEgg is frustrating. I just wanted to get my disk installed.
I am just really upset by this whole experience and would have much rather purchased another product from a different manufacturer and retailer.
I would have given this card a 5 Egg rating, but after this experience it was easy to only give 2.

1 out of 5 people found this review helpful. Did you? Yes No

  • Taylor B.
  • 7/11/2014 4:54:19 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsSimply Amazing

Pros: Paired this card with DT990 headphones and it sounds amazing. ASUS have made an absolutely stunning sounding piece of hardware. I use this for gaming (CSGO) mostly and can hear everything on the map, enemy positions and what gun they are using, even in chaotic gun game servers!

Cons: Like others have mentioned this card in not plug and play and takes some work to get up and running. Make sure the molex is tightly in the socket and the had is firmly in the pci-e slot. I have this installed on windows 8.1 64-bit and windows required 3 updates before it would recognize the card in device manager. Install unified drivers after those updates install and the card works as advertised.

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  • MARIO A.
  • 7/7/2014 12:29:32 AM
  • Tech Level: Average
  • Ownership: more than 1 year

1 out of 5 eggsBuy this if you want hearing loss

Pros: I got this on sale when it was only 100$ (not at newegg), which at the time was a very good value for the soundcard.

Cons: * Asus did not honor their 3 year warranty. Sent them a support ticket online and called them when I still had a year left on my warranty; they lied to me and said the warranty expired. I tried explaining them and even sent proof that I bought it on a specific date but they ignored me. Do not trust Asus or their warranty/RMA system.

* This card will likely cause you numerous crashes and BSODs on your computer. It has compatibility problems with many games, and I've tried many drivers ranging from official to custom made ones.

* The most problematic issue is the high pitched screeching noise. I rated this 1 star just for this hardware defect issue, because it is loud enough to potentially damage your eardrums. The only way to stop it is to manually disconnect whatever sound system/headphones is connected to the soundcard ports. Many people are having this issue, do a google search before wasting money on this card. Luckily enough each time it happened, I was fast enough to react and remove my headphones from my head very quickly. With this major flaw, I wonder why no one has started a class-action lawsuit against Asus for this.

Other Thoughts: Would be a fantastic soundcard if it wasn't plagued by driver issues, eardrum blowing high-pitched screeches and absolutely abysmal customer service.
Do yourself a favor and just buy a DAC; you don't really need a soundcard.

3 out of 5 people found this review helpful. Did you? Yes No

  • Levi A.
  • 7/4/2014 11:05:23 PM
  • Tech Level: Average
  • Ownership: more than 1 year
  • Verified Owner

1 out of 5 eggsNot worth it.

Pros: It sounds good (while it lasted), looks nice.

Cons: I'll be honest over the year or so that I've owned this card it has been an absolute nightmare. When I first tried to install the card the Xonar Audio Center, the sound control, that came with the card was basically useless. It took an unreal amount of digging to actually find the driver only to find out that It didn't do anything. I tried messing with the settings changing speakers to headphones and to any other combination possible, but nothing worked. After I re installed the driver a few times and tried turning it to headphones again I finally managed to get sound to come out. I had it for about 3 months before I finally got some recording equipment for my card. I was excited to try it out, but then the next problem showed up. I plugged in my equipment and there was no feed. Once again I wen't through a process of re installing drivers and opening my computer up before I gave up and called customer service. Asus had an awful customer service rep that was not very knowledgeable about the card at all. He told me nothing that I hadn't already tried and barely knew what any of the actual parts of the card's were. After a while I figured that the card's quarter inch input was broken or not soldered well and so I asked him about sending it back for an RMA. He told me that he would send me an email for all the proper procedures to send the card in. I waited for a few days and never received and email. I called and waited 2 more times before I gave up and decided to just leave it be and wait until I can buy a new card and probably give this card away to a friend or put it in a different computer build. Flash forward another 6 months and I tried to work with some of the settings in the Xonar Audio Center. I messed with some of the audio effects, but I noticed something odd after I was done. An echoing effect was still on. So I go to the Audio Center and find that no effects are actually active. I try turning effects on and off, but it didn't work. Wen't online and absolutely no one had info on this problem. I once again called customer service and they had no clue what was happening and could not help me. Eventually I just re installed the driver again. I had to do this 3 times and it became apparent to me that I could not go into the effects section of the program with out incurring this echo effect. I eventually decided after fixing it to never touch the Audio Center again. 4 or so more months pass with relative ease and then I decide to wipe my computer to do a duel boot. After installing windows I go to install my driver's again and I install the Xonar driver with little problems and get it up and running in a short amount of time. I was fine until only a few days later I start my computer up and then there is no sound. Everything is plugged in the computer recognizes the card all the settings are the same as they have always been nothing has really changed. Just no more sound. So in conclusion i'm done with this card and would never recommend it

Other Thoughts: I don't think I will ever buy an Asus sound product again. This card was not worth the near 200 dollars that I payed for it. The Driver just does not seem to work very well at all.

3 out of 5 people found this review helpful. Did you? Yes No

  • Matthew R.
  • 7/3/2014 6:54:07 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsPowers HD598

Pros: I have no problems with this sound card. Powers my headphones and stereo receiver well with no noise.

Cons: Driver from ASUS is lacking. Try using Unified Driver instead.

Other Thoughts: Using this card with my Sennheiser HD598.

0 out of 1 people found this review helpful. Did you? Yes No

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Item#: N82E16829132010
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