saab choro
do you know how much your amplifier produces watts??
think its mono
produces above 800Wrms
F 15D
on JBL 1204
a 300Wrms subs
how can it be run??
its gonna blow up
@ 8 ohms
600Wrms amplfier will run it
but crossing over 600Wrms @ 4 ohms amplfieir
gonna blow up your subs coil
and another think
you are using this Solid Audio F15d
which supports SPL 1000Wrms subwoofer
Why are you running too much heavy amplfieir in your car
with stock alternator 45A
your pre restarts , cause voltage drop less then 10V
your POWER HOUSE(alternator + battery)
IS TOO WEAK FOR THIS AMPLFIER
and sure to say " you amplifier is not capable of running small subs"
anotherword " improper match up"
Amplfier is really powerfull