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Ok, 2.1 speaker setup.
If you had a 5.1 speaker setup, then it might have been worth it to get a sound card with an optical output.
I would say to get whichever headphones you like DT1990 or T1.
Then spend whatever is leftover in the audio budget, for the DAC/amp.
I'm fairly sure the Hifimediy (optical) DAC will be a better DAC function, then whatever is built into the PC's on-board audio.
Hifimediy DAC, should not have to spend more then $70, or as little as $30, for a USB DAC....
If you use the sound card's optical port (on-board or add-on sound card), to the DAC, the headphone surround sound will pass thru the...
I'm guessing you have a feedback loop.
Try using separate surge protectors.
You could also trying using an optically connected DAC,...
I noticed some people on Head-Fi always seem to compare headphone audio to cars?
I would say to just keep using the FiiO Q1 MK II as the DAC, no real need to buy another DAC.
I would assume the Amirons would be a good choice, but i would not play that price.
Better value to find a used T90.
Or buy one of those...
The SB-Z card does come with a fairly good CS4398 DAC chip :)
If you just bought a headphone amplifer, you would connect it to the...
Unless you know of a good reason for needing the Creative X7, like a need to hook up unpowered speakers, get the G6
Better to Go
Sound card > optical DAC > amp > headphones.
The AD700X is fairly easy to drive.
Nothing wrong with using a decented...
Beyerdynamic T90 headphones.
The AD700X wil work plugged directly into the SB-Z card's headphone jack, guessing it will give the AD700X a bump in the bass.