I'm sorry to hear it buddy. I have the same exact setup as you and had what sounds like the same exact problem. I have good news and bad news. The good news is that mine is finally resolved, working super great and I know exactly what the problem was. The bad news is that for me the problem was faulty prep in the first harness they sent me and I ultimately had to completely reinstall a replacement harness to fix the problem. I hope yours is not the same and easier to resolve but that's what I had to do.
I believe there was a QC lapse in July/August when mine was ordered. They initially neglected to send my tweeters and the yellow power wires on the harness were bundled all the way up to the connecter ends vs. split off a few feet back where they exit the firewall. Next, I noticed that the illumination wasn't working on my head unit and discovered the initial harness had an inverting of the illumination wire on the 6 pin head unit connector so it wasn't passing through the current to light the deck. See dots on picture below showing thin illumination wire on left from factory plug and massively thick one on O+ connector on right not matching up to same seat.
I had to repair that by performing microsurgery on the connector and switching the pin. It was also evident that the massive thickness of the wire insulation on the initial O+ harness kept the pins from being able to fully seat get tightly connect into the connector plug (see pic below)…
This should have been hint and foreshadowed what would be the ultimate problem with the popping ang hum sound. Anyway all of these were clues that someone perhaps was not entirely on point in putting my install package together.
This said, got to give credit to Daniel that he owned the problems and was more than contrite and accommodating in working the process by promptly sending new everything until it was completely fixed. First we tried completely new amps but that did not fix the problem and then we bypassed the sub amp by plugging the sub umbilical into the unused sub output of the primary DSP amp which resulted in clean signal and no pop. This told us that the problem was not the amp (because had two sub amp tested) and nothing downstream of the amp (i.e. sub umbilical or enclosure) as it worked fine connected to primary DSP.
So finally we arrived at only thing left to do was get a new harness installed. I naturally was not thrilled by the need to uninstall and completely reinstall a new harness, but I have been through many of these type of mods over the years and accept that it comes with the territory and is part of the process. When the new harness arrived, I immediately noticed many indicators that it was much more soundly put together. FOr starters, check out this picture showing the relative size of the wire insulation on the initial harness (left) vs. the new harness (right)…
As I mentioned in the pictures above for the illumination wire issue, the massive thickness in the wires of the initial harness was keeping the pins from seating well and my reasonably well informed hypothesis rests in that the same issue was causing the hum and pop sound because the instant I hooked up the new harness it was completely gone.
I would also mention that before the new harness, I thought the only deficiency was the hum and pop noise, but there was more. As soon as the new harness was installed, the performance of the sub went through the roof. Before, I could crank the gain knob and not hear a material difference in bass presence between 40% and 100%. Now anything over 50% is overpowering so obviously performance of the bass enclosure was impeded by the old harness as well.
So having to go through the extra work was frustrating but Daniel stood behind his product and made it right in all regards. And in the end, the sound of the system is now PHENOMENAL and I derive so much enjoyment at listening to my tunes with this standard of quality. For both of these reasons, I had no problem overlooking the hiccup on the initial harness and recommending the solution to my buddy for install in his rig. Actually listening to mine helped too I suppose.
So best advice is have patience, take advantage of Daniel's commitment to make it right and best of luck for a much easier fix than I experienced.
Cheers
JC