Im using it in 4.4 with the M15 and don't notice any noise... He'll I've used mine with my desktop rig and couldn't tell of any noise, these ain't sensitive at all
Dark Matter is not sensitive per se, they have a pretty average impedance, I just happened to review them about at the same time as M15, and noticed that M15 has a higher output impedance. While music is playing, it is normal to not notice any hiss or background noise, M15 does not have background noise or distortion, just a faint hiss, which is a result of impedance mismatching.
I also used Dark Matter with other destkop equipment, including Cyrus One Cast via adapter cables, as well as music players like DX300 and SE180, usually you can't hear hiss at all, with M15, there is a faint hissing. It might be too faint for most people to notice anyways, but as a reviewer I can't notice it and not mention it, otherwise what would even be the purpose of me reviewing things anymore...
Most people can listen with a tiny bit of hiss without a problem, especially since the hiss would stay quiet regardless of the volume, at about -50 dB to -70dB relative to the music playing at normal volumes, so chances are it is not noticeable.
@Dobrescu George, I wanted to buy Dark Matter, but my source is questyle m15
It's so sad that there is background noise with them.
Have you tried listening to the 3.5mm output, is there any noise?
There is hissing, it is not audble while music is playing usually, but if you listen extremely quiet, you may notice it. Hissing is generally not an issue and some people do not notice it at all, since it is below the threshold of hearing, especially while music is playing. It is like a white noise that's extremely faint.
M15 is a bit hissy with sensitive IEMs, not just dark matter, but also Campfire Atlas, Xenn Mangird Tea 2, even Ambient Acoustics MAD24. The thing is, M15 has a slightly high output impedance.
Altoguh this is true, I still use M15 with Dark Matter personally, and it is not a problem for me, the noise is not audible with music, hissing is about less than half what I would get with FiiO X5 years ago, so I would not stress it too much.
If you don't have something with zero hiss on the table, like ddHIFI TC44C, for example (I simply have the two because I'm writing about the two, TC44C is not better than M15 only because it has lower hiss), then you won't notice it. I need to mention it, but it is not bad by any means, just a very faint trace of hiss on M15. I like M15 though, still use it with many IEMs and headphones, it is really convenient, its review also coming soon