When my sub is hitting hard and low, 26hz. It makes a bit of a funny sound, almost as if there is a little engine running in there, bit of a rattling sound. The sub is only a few months old and still in very good condition. I dont think its getting a clipped signal(i have a smd dd1). It is in a sealed box, recommended is about 1.5 cu/ft, its a lil bigger than that, about 1.75 cu/ft. I am 99.9% sure nothing is rattling in the box.
sub- JL 12 W7 in a custom fiberglass box
Amp-1200 watts, JBL Grand Touring Series Class D Monoblock Amplifier
RMS Power Output:
4 Ohms: 787 watts x 1 chan.
2 Ohms: 1114 watts x 1 chan.
HU- Pioneer AVH-P8400BH
Electrical- Yellow top Optima under the hood. 1 run of 0g + to a dist block, 4g from that to the amp.
- Grounds- Chassis
Is it maybe because my amp sux? I have found out that it has a damping factor of 6, which I think is quite low, could that maybe be the problem?
Any help would be much appreciated, Thanks guys!