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post #11 of 17
Quote:
Originally Posted by punx View Post

in lame mans terms
biggrin.gif

1. Digital audio file is played on your computer
2. Digital signal is changed by DSP (digital sound processing) effects on your sound card. This includes things like EQ or dolby headphone.
3. Digital signal is converted to analogue signal on the DAC chip on your sound card
4a. Analogue signal is amplified by your sound card's headphone output
or
4b. Analogue signal is sent as a line output signal to an external amplifier

The DAC on your sound card is good. This A1 might change the sound, because of its high output impedance, but most people wouldn't consider this a good thing. For comparison, I think the output impedance of the STX is around 10 ohms and the A1 is 100 ohm. Pretty sure this is only meant to be used with Beyer's T1 flagship, and I think using it with the DT990 would make them sound noticeably worse.
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post #12 of 17
LOL about some people here on audio, saying the STX is enough. Have you guys even had a Xonar STX besides the OP? Some obviously not. Well I have had the STX. It does not have enough headphone amplification performance to run 600ohm headphones to their fullest. A good dedicated amp will be a night and day difference.


Let me put this here for you, because some pc guys on here just dont have a clue.
http://www.head-fi.org/t/640896/dt990-600ohm-with-asus-xonar-essence-st
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post #13 of 17
Quote:
Originally Posted by Swolern View Post

Let me put this here for you, because some pc guys on here just dont have a clue.
http://www.head-fi.org/t/640896/dt990-600ohm-with-asus-xonar-essence-st
Quote:
"Currently listening to music (Foobar 2000) with my Essence STX and DT990 Premium 600-Ohm, volume at 60%, seem plenty loud enough."
Quote:
"The Xonar ST/STX have similar maximum output into 600 Ω to the O2 (~7 Vrms)."

Hoo boy, yeah that sure proved us wrong...

Heck I'm not even saying he wouldn't see a slight improvement from a dedicated amp, but the A1 is not the right purchase.

http://www.stereophile.com/content/asus-xonar-essence-ststx-soundcards-measurements
Edited by DrGroove - 3/7/14 at 6:03pm
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post #14 of 17
^May i ask if you actually owned the STX or any high impedance headphones?

Im guessing you havent owned either one of the above mentioned.
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post #15 of 17
No I haven't owned either of these products, nor do I have to. DT990 600 ohm has a sensitivity of 96 dB, and even if you assume it dips as low as 94 dB it doesn't require that much power.

To get 110 dB out of it requires 4.89 volts, and the STX has a maximum output of 7.03 volts.
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post #16 of 17
The above is right , but it's better to get it straight from the OP.
Quote:
Originally Posted by punx View Post

I can get the A1 at a reasonable price. Can u please explain to me. (in lame mans terms) the steps from pc, sound card, dac, amp head phones.

So can I use the sound card a a dac? I know stuff all about amps/ dac. All I know is I got a stx witch has a built in headphone amp but it won't boost the dt990 premiums 600 ohms to 100%
What does the above mean? Clarify.

If you're saying "it doesn't get as loud as I want" then regardless of the above loudness calculations, whatever you have isn't enough (if that's the case, either the music is pretty quiet, you need to get your ears checked, you don't have it set on the highest setting, or something else). Then you need to find something more powerful, in which case the specs should help you out. The answer wouldn't be the A1, as that gives 100 mW into 600 ohms compared to about 80 mW into 600 ohms on the STX. i.e. about 1 dB louder, which is perceptually not very much at all.

If you're not talking about volume, what basis does that statement have? Did you compare with something else? Did you hear something from somebody else? What particularly are you looking for?
post #17 of 17
Thread Starter 
I am only going off advice I am getting. I am no expert audiophile. All I am trying to do is get my headphones going to it potential. And from what I am reading the stx is only getting me there 50% and what I am getting from this is that I need a dac/amp combo. But have also been told my stx is considered a dac. And the A1 is an over priced amp that will make the headphones worse?? ?? It gets a little confusing when u have a few people giving what u think is good advice then someone else comes to the table with what u think is good advice but aposes what the original person as said.
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