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Actually, it has amplifier inside. You need amplifier chip for headphone to working. Without it, it won't work and you will only hear from DAC. So, DAC > opAMP > amplifier > headphone. Plus, it is not ever high end, neither sound card do anyway. From the look inside of FiiO e10K, I will saying it is not bad but I don't like their design that way. The only thing that would I considered a headphone amplifier as high end would be better capacitor, opamp, amplifier and semi toroidal/full toroidal. It is expensive too.
DAC quite literally stands for digital to analog converter... It does exactly what a sound card does. Typically only the actual internal cards are called sound cards, but gaming oriented companies, like Creative, tend to use "external sound card" to relate more to non-audio types of people.
Sound card and DAC are one in the same. It is merely marketing labels. You can get DACs that have full 7.1 support via any kind of connection you can imagine, even via lossy compressed formats with your precious Toslink, and support for all kinds of different formats.
E10K is known in the audiophile realm as one of the best bang for buck portable usb dac/amp. There just isn't much contest. The Omni just doesn't make the cut with sound quality, as it doesn't even have a dedicated dac chipset. If you really must have surround for super cheap, then it would be okay... but what kind of person gets a 5.1 surround setup and doesn't connect it to something that can give it lossless uncompressed PCM, or a decent lossless uncompressed/compressed format? DDL just isn't that great, as it is lossy compressed.
For headphones, surround is all emulated, read virtual surround, so it really doesn't matter. You can get similar results, if not better (thank the extra spatial processing, read noises from below and above) from the native spatial/7.1 surround emulation on Win 10, Sonic and Atmos for headphones. And if that isn't enough, there are other software means for virtual surround.
The Omni is just in an odd spot, it just does a lot of things but doesn't really do any of them that great.
All that said, considering that the OP runs with an old Dell Inspiron from 2011, I doubt his budget is that grand. If his budget was $100, I'd probably recommend the Sennheiser GSP300, or something like a Sennheiser HD 250 Pro and a cheap clip on mic, and use his built in sound.
Yes. Omni has DAC. At lease, Creative Omni can support up to 600 ohm headphone while FiiO e10K does not. Ever schiit magni 3 can does better. Just need RCA from computer to amplifier and headphone then all good. If rather to have DAC/AMP, then this is good choose and more output power than FiiO e10K. http://www.schiit.com/products/fulla-2
E10K supports 600 Ohm too even not specifically mentioned at the datasgeet. It has a regulating knob you just need to set at "6" and then it runs a 600 Ohm Headphones just fine. Beside that it actually is recommended in every audiophile forum as the DAC to pair with the 600 Ohm Beyerdynamics... Every audiphile knows that... Also every Audiophile knows that 600 Ohm doesnt mean that it has betetr SOund which is just true in the spcial case for Beyerdynamic DT 880. For the DT 990 it is not. The sound is just as good as the 250 Ohm version there which is as good as the 80 Ohm version.
Ever if that were true. 600 Ohm headphone might be too much for E10K? Given 32 Ohm 200 mW. It would be about 600 Ohm 10.67 mW. Also it need more voltage for that. 250 Ohm headphone is okay but not great as equiped 250 ohm headphone into my creative ZxR. Knob is an volume passive as well.
look into hardware forum ask there and get that information verfied there. I not talking about the volume control. besides that you missing a few pices in your calulation, Ampere and the calculation is that 600 Ohm has the porblem about not fully driven but to have to low volume with a DAC not supporting 600 Ohm. The Fiio E10K can drive at standard settings a 600 Ohm already to 120 Db. Louder then it is healthy to hear over a long period.
and 250 Ohm does not mean the sound is worse. Ohm does say nothing about sound quality. Every hifi magazine, forum or audiophile will conffirm that. Espacially msot high end headphones in a priceclass above 2,000$ have "just" 32 Ohm...
Given: 32 Ohm 200mw. Find: power for 600 Ohm. 600/32 = 18.75. 200/18.75 = 10.67 mW Answer: 600 Ohm 10.67 mW. So this is not wrong calulation. FiiO E10K is not strong enough for 600 Ohm. Trust me, I tried my DT 990 on my cell phone, it is not good sound quailty as Creative ZxR. That is what happen if amplifier in cell phone is underpowered to headphone. Ever I tried my friend's 600 Ohm headphone and FiiO E10K when he have sound quailty problem. Then I recommend him a Schiit for good price headphone amplifier. Surprise, it getting better. Just because 32 Ohm cost $2000, it does not mean it is really good, unless it has 4XLR, better SPL, Freq range, high power, etc. It can be they added fancy wood on headphone too.
Really, if you have source, please showing me.
W = Volt *Ampere
For DT 880 and 990 600Ohm + Fiio E10K feelf ree to translate:
http://www.hifi-forum.de/viewthread-214-20522.html
https://www.computerbase.de/forum/threads/beyer-dt-880-600-ohm-suche-amp-dac.1551022/
https://www.computerbase.de/forum/threads/suche-eine-geeignete-soundkarte-khv-fuer-dt-880-600ohm.1408472/
http://www.hifi-forum.de/viewthread-214-21768.html
http://www.hifi-forum.de/viewthread-214-11073.html
https://www.computerbase.de/forum/threads/suche-eine-geeignete-soundkarte-khv-fuer-dt-880-600ohm.1408472/
https://linustechtips.com/main/topic/480675-dt-880-premiums-fiio-e10k-ampdac/
PS: I had run that combo btw too. Got all 3 DT mdoells in 250 and 600 Ohm and used a Fiio E10K Olympus 2 until I gave it away for a friend as I hadnt any need for it with a ZxR.
what W = Volt *Ampere? That made no sense.
https://www.rapidtables.com/calc/electric/watt-volt-amp-calculator.html
That's also the same mistake is done with PSU's as most pc users just look at the watts then also at the Ampere which often is way more intresting espacially for OC'lers then the Watts.
You also have a really bad habit of quoting data sheets without properly analyzing them before using them as proof.
The Soundblaster Omni has better driver and firmware support and more controllable software options.
The FiiO E10K lacks an amp....only has a driver availible for it...and like Startek...only has an FAQ as a manual.
Now if you are curious how an external audio card can be used through USB...look at how GPU risers work....