I want the other thread to get buried as it mentions the tweeters, and they are definitely not the problem...
Equipment is Fiio X5 (digital) --> Helix Pro Mk2 w/Director --> Zapco st 4 channel and mono --> GB10s, GS690 & GB12s
NO ANALOG SOURCE TO THE DSP, ONLY THE FIIO. THE DIRECTOR IS MY MAIN VOLUME.
Here's the problem:
I get a crackling sound in my tweeters at a medium/high volume, but only with loud recordings and bass heavy music.
When I turn the bass down in the Director, the crackling stops and I can turn the volume up a little more. Basically, the volume can be turned up without the crackling, to the extend that the bass is turned down.
Previously, I had the same equipment above with a MiniDSP and I did not have this issue...