Okay, i have installed an amp for probably around my 20th time, but the first time in a 1997-2003 F-150, my question is where is a good spot to ground. I installed the amp fine, and put the ground onto the seat bolt. What it does is thump lightly and when it does play it dissorts at low levels, i am almost postive it is the ground.

 

underneath the seatbelt bolts there is a gusset under the cab. it has holes in it. on the passenger side there is an egg shaped hole, i rounded that out with a 1" unibit, so i could get a socket in there. i then took a 1/4" pilot bit and drilled a spotter through the cab floor. i used the jl master ground lug. its a nickel plated stud with a nut on top and bottom. this way my grounds are tight, wont ever be a prollem. yes sand metal clean. mine is an 07, so i dont know urs. if u can put a bolt through the cab floor, use star washers, then u will have an awesome ground. the seat belt bolts have been said by some to have issues, others dont

 

Thanks buddy, im going to mess with it more tommarow. The subwoofer is in full excursion but has little bass and sounds very dissorted so i believe it is the ground, because if adjusted right it sounds clearer.

 

how many subs are you running?

 

Uno.

 

uno. huh i like playing that game every now and then. i was just wondering if you had more than one sub because they could be out of phase with each other or maybe out of phase with the other speakers in the vehicle.

 

Everything sounds in sync, just the bass blows. I had the same amp and subwoofer in a Integra Type R, and now the subwoofer sounds like crap, might be because its 7 years old thought.

 

Tell us about the whole system so we can offer more help. What size wire, etc.

 

when the amp and sub are playing and the sub does what you described earlier, go to full x do the led indicator lights on the amp dim at all?

 

Nothing Dim's i had it perfectly non bolted ground wire today sounded as good as an Infinity is going to sound then i hit a bump and it's back to the so-so sound, so i know it is just the ground.


Infinity Kappa Perfect
Q logic ( 1.25 )
Autotek 700 watt Peak, 300 Watt RMS @ 4 ohms ( 2 channel )
4 gauge power wire
8 gauge ground

I hope by this December to have two JL or Alpine Subwoofers down firing under the seat and the Autotek amp to my doors, im going for SQ not pure SPL.

 

Sounds like a bad connection somewhere if it changes when you hit a bump. Could be ground but could be internal to amp or any other connection. Why only 8 gauge on the ground? Real short run? I prefer the same on both sides myself even if 8 is enough for that amp. Clean the paint off of your grounding point.

 

Thats what im going to do, ground is only 4 inches.

I'm eventually going to do 0/1 gauge wiring, with my new amp.