The most massive change: Noise floor is invisible to me now...seriously, invisible. Hiss be gone!
It's basically acting like a high-cut filter, but there has been no cutoff to the highs where I want them - cymbals, chimes, vocal clicks (mouthy noise...whatever you call it), all highs sound just as clear and airy as before; the only difference has been the underlying 'crunchy' hiss that became so prominent when the Heir 4.Ais became my go-to IEM.
In addition to that, the C5 was basically added in to correct for the sound profile of the Heir 4.Ai...that sounds harsh, but I really did need a little more substance in the low end.
Depending on the track (and my listening surroundings) I now use the bass extender. I'm saying 'extender' and not 'boost', as it really doesn't do much to the mid-bass, only that nice, rumbly sub-bass that the Heirs were definitely shy on. The C5 'extender' is as strong as everyone says pushing the sub 150Hz up a good amount, but it really doesn't touch anything around it over, say 250Hz. Separation is still there, and the mid-bass maintains a lot of detail and clarity - quick attack, very polished.
Those 2 Low-end drivers on the Heir 4.Ai finally have to get off their asses and do something. I'll admit I'm a bit of a bass-head at times but, as mentioned, it tends to depend on the genre I'm listening to more than anything. Anyhow, it's sometimes nice to flick a switch and have your head filled with dance club thunder
Conclusion: If you have this player with some very sensitive IEMs a nice, quiet amp might be just the thing you need to get that signal to noise ratio more in your favour.
Much obliged goodvibes! That's twice you've come to my aid - hope I can repay the favour sometime!
Ah ha, twice in one thread. I figured opening it up couldn't hurt too much - any obvious breaks in solder, or whatever else I could inspect by sight is all I was interested in finding out. I didn't really expect it would be as simple as a a screw out of place. I didn't put anything on the screw, but they're all good and tight now - actually the buttons on the front became a bit more stiff after tightening...stiff in a good way.
Should I have a lazy day, maybe I'll open it back up and seal up the screws once and for all, but I imagine it should hold for a good long time yet.
Thanks again for your help on this bearFNF!
Not sure how it happened, but I did hear something rattle once before - I figured I was just hearing the metal buttons inside their bored holes. Anyhow, this player had gone through shipping on at least two occasions - if the screw wasn't perfectly in there to begin with that would probably have done it.
Best wishes, one and all!