help! thumping sound from the subs

[saxo_girl_1985]

hi, can anyone help? i know subs are ment to thump!!!

but my subs have like a heart beat sound even with there turned down, or with no music on.

its pissing me off!

ive tried the ground, swapind the speaker wires over, moving wires, nothing works.

maybe, and i dont know that much bout electricals, the beat is the drain from the battery trying to keep it alive??
Please help...

i have 2 12" audiobahn subs, and 1 2400usa crunch with volt metre.

[mikey362vtr]

where are you earthing to and what gauge wire are you using??? i had this a while ago because the earth wasnt good enough

[saxo_girl_1985]

where are you earthing to and what gauge wire are you using??? i had this a while ago because the earth wasnt good enough

i thought it might have been the earth, so i re-earthed it. i might try re-earthing again, i think i got a 4 or 8 gauge.

[LSOfreak]

mines doing this, i did another earth but still like it.Such a weird problem, anyone got any ideas?

[McBain]

Check for shorts and bad wiring, easiest thing to do is to swap the amp with another to see if the amp is the problem.
Sounds like the amp is going in and out of protect, what's your battery voltage like?

[LSOfreak]

thats exactly it. the amps f***d. tryed with another amp and worked fine, thanks

[DJDannyB]

mine does it when i change track.. not when there is no music on though!

[Bean]

yea my mates just bought a second hand amp and his now does this :(

[r_i_c_h_1]

Was a while ago... but my m8 had this on his car. I'm sure he fixed it by running a seperate small earth to the head unit. Just a ring-type connection onto one of the spare threded holes on the back of it.