trying to figure out what went wrong with my brother sub. box is 3.85 cubes net turned to 30 hz. (2 4" diameter pvc pipes... yes i know that not enough port area.. was suppose to be a temp box). amp is a kole qx1 3000d wired at 2 ohm but turned way down.. i was planning to redo the box and everything. i measured voltage to be 17v at amp terminals with a 55hz test tone recorded at -3 db. you can do the math on that if you like but its not much power at all..

its in a mercury sable with stock system.

installed ----------> stock head unit - stock amp - mtx req - amp (i told him to not turn the headunit volume past half as it starts to clip and distort)

current condition is the vc is locked up... coils still read 2 ohm which i thought was odd..

this sub was once thrown around in his trunk (car accident) while it was in a smaller sealed box.. it was ripped from the box so im thinking the coil might have been miss aligned.

other possibility is he didnt listen to me and send it a nasty clipped signal and played some fucked up song from this ipod that was recorded louder then others..

also his previous amp was a kenwood amp rated at 900rms that got fried (possible from low voltage), could that have caused any damage that lead to this.

any thought on what went wrong?

my thoughts are that the sub was damaged in the car accident and it just finally went out of wack.

i havent pulled the sub to look at it yet but plan to soon

Sounds to me like there were a lot of problems. Not surprised the sub died after reading all of that.

I had a 12L7 DIDNT LAST LONG FOR ME. I dont know what happen to that thing. I probably clipped the hell out of it and didnt know.Locked up on me too.

Sounds to me like there were a lot of problems. Not surprised the sub died after reading all of that.

same thing i thought as i typed the post

I had a 12L7 DIDNT LAST LONG FOR ME. I dont know what happen to that thing. I probably clipped the hell out of it and didnt know.Locked up on me too.

he ran this sub for quite awhile. even after the accident it seemed fine.

now i gota find him a replacement sub.. maybe a used bl or something along those lines

If the coils still reads the magnet cracked and shifted, the pole piece shifted, or the top plate shifted.

If the coils still reads the magnet cracked and shifted, the pole piece shifted, or the top plate shifted.

thanks for pointing that out

ill have to take it out of the box and see.. if its anything cool ill post a picture

I had a 12L7 DIDNT LAST LONG FOR ME. I dont know what happen to that thing. I probably clipped the hell out of it and didnt know.Locked up on me too.

he ran this sub for quite awhile. even after the accident it seemed fine.

now i gota find him a replacement sub.. maybe a used bl or something along those lines

A BL would be a grand upgrade!!!