Is it worth it getting a DAC+AMP if i already have a sound card + amp. i have the Magni 2 Uber so i use the preamp RCAs for powered monitors,, but i don't wanna lose any power that I'm getting what will i sacrifice buy getting a Modi2 DAC vs keeping a creative Titanium X-fi HD, I plan on getting this card
Asus Essence STX II sound card if the DAC ain't worth getting
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Hopefully you disabled the motherboard's on-board audio, in the BIOS, when you installed the Ti-HD (Titanium-HD) sound card.
I would think having the Ti-HD's RCA jacks connected to the Magni 2 Uber's input RCA jacks and have both the studio monitors and headphones connected to the Magni 2 Uber, would be the best setup.
The Ti-HD's RCA outputs, should provide a slightly cleaner analog audio signal, then the Ti-HD's headphone jack.
As you already have the Creative Labs Titanium-HD sound card (and it's nice PCM1794 DAC chip ), I really doubt the Modi 2 would make a noticeable difference.
Unless there is noticeable electrical noise being generated inside the computer case, which would effect the analog audio signal coming from the Ti-HD, the Modi is not really needed.
You might consider replacing the Ti-HD's two I/V slotted op-amps or the even the buffer op-amp, like using TC-99 metal op-amps.
I would think the something like the Schiit Bifrost might be something to consider, if your looking for improving the DAC feature, over the current Ti-HD.
If you got the Bifrost, then there would be no need for replacing the Ti-HD's op-amps.
Can't see the Asus Essence STX II offering any better audio quality, over the current Ti-HD/Magni setup.
Also the Essence STX II can not send headphone surround sound out it's RCA line-outputs jack, where as the Ti-HD can.