Napalmhardcore your a legend! i have an onmi but can't be arsed to install the drivers (will do later to compare the delay and ill let you know compared to the x7)
Focusrite Scarlett! i was going to buy one and an audio technica xlr headset to use with razer surround to get what I'm after on the PC.
can you try reading a paragraph to yourself from a book with the monitor on and closed or in ear hp's on the omni and then the scarlett?
I'm almost sure the Scarlett is pretty close to zero delay, I'd compare that to the delay on the mixamp,TAC,Tritton ones, plantronics rig, and sound blaster x-fi platinum that i have. (but not zero delay on my zxr when playing with surround processing on!)
when i try reading with a delay i get all messed up. that's the issue i have with delays.
its like the analogue is still processed to some level prior to feeding back.
i have the same experience as you on the x7 and the crystal voice stuff, i like your explanation.
man i just hooked up the x7 again, its significantly better than the TAC. my bass is a little too punchy like its deviating, I'm reading the x7 thread that yethal mentioned and the poster says the op amps run on 22v. my muses are rated to 17v i think. switched them back to the originals and got an improvement. pretty sure they are not supplied 22v though as the two mono amps are rated at like 18v on the stock amps. i need a hand held multi meter!
thanks for checking the omni out again.