Hello Gentleman,
I started my quest for the HWK15 about 3 months ago after i won and auction on eBay for a pair of the Dayton series II woofers. In my search for an enclosure design for these i stumbled upon a post on a forum relating to the HWK i was immediately interested bought the plans and built my version. I'm running the true Iso alignment but i have made some modifications. I had a PSP 6" Aero port left over from my days in competition car audio so i used that in substitution of the coffee can method

. I also added a Dayton 250w plate amp to the rear panel opposite of the port. I know it will shrink the volume but the difference was minimal. Here in lies a problem. During some very low bass notes i get a loud pop from the front sub (in the 6") port section. Obviously the sub is bottoming out and even though im feeding them quite a bit less power than there rated for. Any ideas from the more seasoned vets of the HWK 15 as to what could be causing this issue?