Im not a woofer designer so this is all coming out of my ass.
Either a composite cone to actually bond the surround to it, instead of it only sticking to the shiny paper layer on a standard cone.
Or stich the cone to the surround.
That is what let go on this one. It just simply tore the thin shiny layer off the cone.
Just like when a dustcap pops off and only tears the shiny paper.. Same thing here.
Also kens ti basket is off center from the motor assy.
Like the holes drilled in his basket are off.
Not like a shifted pole but more like the basket is wrong.
The 4" hole in his basket is actually over the gap by a cunt hair
This is where im guessing the coil drag and "knock" sound came from.
As soon as i got in the car i asked what is that noise? He mentioned it always did that and after looking around i assumed it was his box rocking on the dancefloor.
Sounded like 2 pieces of wood banging.
So i let er rip.
Got through quite a few tests.
Searching for peak freq and the f3 point.
Sub never fell off in vol, fb of 32 i figured the f3 would be around 27ish.
Was playing 28, sounded great. Score was good
Meaning not at f3 yet, went to 27, got 1/2way thru the knob and bang.
And yes i was watching the cone most of the runs.
If i had thought for a second that something wasnt good i would have stopped.
This is not my first go around with putting double rms to something, or even rustys subs for that matter.
Remember, rusty and i knew each other long before DC ever started.
Have been friends on the 12v retail side for years.
Im not saying something is bad here, just some shit to look into.
Luv ya crusty.