ok good. looks like the voice coil is fine.
Only last thing I suggest you do is take out the subwoofer and make sure both terminals on the sub is connected and if it is ok I say your amp is bad.
Note: I have a pair of BP7006s which has amps on them and found out the subs were not working, but the light was on.
So I called DefTech and since I was under warranty they sent me a new amp and problem solved!
If you want to cut to the chase, I would just call DefTech and talk to tech support and see what they can do for you.
I read on here that people had their audio out of warranty and they still sent them replacement parts at no charge. They are great folks there, so just give them a ring.
*** Actually if you go to the speakers section here on AVS there is a support team from DefTech. Either PM, post a message or call them and let them know your issue.
B&W 684s, 685s, HTM62
DIY SI 18" / port tuned- 17hz
Onkyo 809, iNuke DSP1000
Projection: Panasonic PT-AE3000U / LED: Sharp 70" -Smart
HTPC: Lenovo q190 w/ Roku / Plex for chuckles / iPad remote