Heya - Antlion Audio (ModMic) staff here.
I suspect this noise may be related to the unblanced mic cable. We have a whole live support team on our Discord to help diagnose and fix this. You can find it on our website (Can't post links yet since this is my first post here. Hi everyone!)
But in case you can't make it or anyone else runs into a similar issue:
First, if you have a ModMic 5 check if you still have this issue if you remove the extension cables. Yes, I know you can't use the mic like that
- If the problem goes away, simply replace that 3.5mm cable with another one, a simple Amazon Basics cable should work. We discontinued the ModMic 5 and modular cable design in part because it amplified problems associated with unbalanced cables like this.
If it is a ModMic 4 or the 5 has this problem even with a short cable, we're in a tougher spot. The first thing I would do is actually test if the problem gets worse as you move wireless devices in the room or house nearer the mic cable. Cell phone, router, mouse, keyboards, anything using an RF signal. For reasons unclear to me based on this post, the extra power from the FiiO may be somehow helping turn the ModMic cable into an antenna that is picking up these noises more than usual. If we can find the source of the noise fixing it will be as simple as moving it away or placing a small physical barrier between the cable and the mic (we're talking like, a cardboard box between you and the router).
The new ModMic Uni or ModMic USB (or ModMic Wireless of course) should not have this issue. So if it is a ModMic Uni or USB please contact us immediately.
Again, jump in our Discord and our staff can help you sort it out if none of these work. We're really here to help!
Sorry you're having some issues, analog audio can be a tricky beast at times!