hey guys,

Just recently my sub has been playing up. I don't think it's a problem with the actual sub, but maybe the amp, wiring or battery. Anyway, sometimes when i'm listening to music the sub decides to just go spastic and hit bass notes when it shouldn't. kinda like it's out of phase, but worse. Even when i turn the sub out on the h/u to 0, it still just rumbles away when it shouldn't be!
Does anyone know what i can do to fix this?

Cheers,

Sam

oooo

First id use a friends mono and see what it does.
If not id be calling jaycar about it...or the ebay dealer you got it from.
You have not had luck with you mono

we looked it over and didnt seem to be wiring, thought it was battery in the end didnt we? shep recomended a light truck battery. anyway maybe take it into audio & car hi-fi when you are down here next man, see what they have to say.

sounds like it might be the amp
check all connections for the amp
have you tried another set of RCA's?

have you tried another set of RCA's?

I posted this on the CAA forums, and one guy had the same problem as me. He said it was the RCA leads, and i reckon that's my problem. It only happens when the car is moving, and funnily enough when i jiggle the RCA leads to the monoblock! lucky it's only a cheap problem to fix.

Now I know it's only at the very end of the RCA's connected to the amp. Can i simply solder on another set of plugs at the end of the leads? or will i have to get a whole new set of RCA's and pull the whole car apart again just to re-wire it?

you might as well put in a new set of good quality RCA's man. saves u having problems like this later on down the track.

if you want you can do that, place a new head on the RCA
but you gotta know which one is the faulty one
easy just to replace the RCA cable
doesnt need to be too fancy as its only there to send a signal
should cost under 10 bucks easy for one cable

If the new rcas dont fix the problem, check the rca terminal on the amp (inside). Sometimes the terminal joints break internally if the rcas have been jiggled around a fair bit. if thats the case, then its a simple solder job...

If you are losing music and the line is going dead, then its the inner rca wire (or terminal), but if you are getting a large thump, or a heavy boom-boom-boom-boom, then its most likely the outer rca sheilding thats letting you down.

A common fault that ppl have, is that the rcas tend to get bumped one too many times, and the rca terminal (on the amp) becomes brittle (internally), particularly on the earth track to rca terminal housing. What happens then, is that the rca to amp housing create a voltage difference and then eventually you get a spark (tiny) across the rca earth which gives it the THUMP sound... It'll die, then build up and you get another THUMP-THUMP-THUMP... It'll be loud no matter what volume you have the H.U. at , and eventually it can destroy the amp power tranistors, and/or the sub..

O.K., I'll stop now... Nyark, nyark.... nerd alert, nerd aleeeeeert... lol AHHH, shut up!!!