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Author Problem with Sub
Jamie
Member
Registered: 1st Apr 02
Location: Aberdeen
User status: Offline
13th Oct 04 at 12:35   View User's Profile U2U Member Reply With Quote
This morning sub started just thumping away (not to the song). Sounded more like static.

So pulled over and disconnected one side (its dual coil) and it still did it, so went to headunit and turned the Sub off. Went back still thumping.


Any ideas?

Its a Lightning Audio 15" running off a 250D Directed Amp and Pioneer headunit.
chr15barn3s
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Registered: 5th Oct 03
Location: Farnborough
User status: Offline
13th Oct 04 at 12:41   View User's Profile U2U Member Reply With Quote
maybe interferance from somewhere??

i dont know anything about these things by the way lol, just guessing



[Edited on 13-10-2004 by chr15barn3s]
Jamie
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Registered: 1st Apr 02
Location: Aberdeen
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13th Oct 04 at 12:50   View User's Profile U2U Member Reply With Quote
Checked ground and its fine.

All other wires aren't loose either
ajscorsa
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Registered: 30th Apr 02
Location: Perceton, North Ayrshire
User status: Offline
13th Oct 04 at 12:51   View User's Profile U2U Member Reply With Quote
it will be to do with the amp. check there is no loose cables ie earth, remote, power
Jamie
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Registered: 1st Apr 02
Location: Aberdeen
User status: Offline
13th Oct 04 at 13:02   View User's Profile U2U Member Reply With Quote
Cheers mate


If everything there is fine, any other ideas?

Still in college til 4.30 so no access to it til then
Richie
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Registered: 3rd Dec 02
Location: Newport, Wales
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13th Oct 04 at 13:04   View User's Profile U2U Member Reply With Quote
has everything been screwed down or does the amp fly about in the boot? Sounds like damaged/crushed RCA leads, bad ground on any device in the car.
Jamie
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Registered: 1st Apr 02
Location: Aberdeen
User status: Offline
13th Oct 04 at 13:18   View User's Profile U2U Member Reply With Quote
RCA leads? Which one are they?

Everything is velcro'd down
chr15barn3s
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Registered: 5th Oct 03
Location: Farnborough
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13th Oct 04 at 13:21   View User's Profile U2U Member Reply With Quote
the ones which go from the head unit to the amp
Jamie
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Registered: 1st Apr 02
Location: Aberdeen
User status: Offline
13th Oct 04 at 13:22   View User's Profile U2U Member Reply With Quote
Ah they looked fine. Double check as they go under seats...
ajscorsa
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Registered: 30th Apr 02
Location: Perceton, North Ayrshire
User status: Offline
13th Oct 04 at 15:32   View User's Profile U2U Member Reply With Quote
aye cos if the amp is on and u pull them out it makes the sub jump couldbe a snapped cable at back of head unit?
3CorsaMeal
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Registered: 11th Apr 02
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13th Oct 04 at 15:37   View User's Profile U2U Member Reply With Quote
sounds like an earth problem to me, usually the sub builds up static and cannot discharge it
3CorsaMeal
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Registered: 11th Apr 02
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13th Oct 04 at 15:37   View User's Profile U2U Member Reply With Quote
any moisture formed near any connections?
psycho sport
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Registered: 27th Mar 03
Location: Guildford Surrey Drives: Vauxhall Monaro
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13th Oct 04 at 15:59   View User's Profile U2U Member Reply With Quote
mine did this. i took the head unit out and checked all the plugs were in properly, the checked fuses and amp. that seemed to fix it. take the fuses out and put em back in.
Jamie
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Registered: 1st Apr 02
Location: Aberdeen
User status: Offline
18th Oct 04 at 12:18   View User's Profile U2U Member Reply With Quote
Right ive reconnected all the wires, checked fuses and its still doing it.

Just turned the sub "off" from the headunit (cuts off output) and turned the volume on the amp up and it thumps like hell.


Any more ideas?
3CorsaMeal
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Registered: 11th Apr 02
User status: Offline
18th Oct 04 at 13:04   View User's Profile U2U Member Reply With Quote
where is it earthed too?

make sure thats decent connection onto bare metal, how long is the earth wire? how long has it been in car?
ajscorsa
Member
Registered: 30th Apr 02
Location: Perceton, North Ayrshire
User status: Offline
18th Oct 04 at 13:08   View User's Profile U2U Member Reply With Quote
check the earth and power cables.

if that fails go over the rca's check for a break in the wire
Martin
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Registered: 15th Mar 04
Location: Dumpstable Drives: Aztec Sxi
User status: Offline
18th Oct 04 at 14:33   View User's Profile U2U Member Reply With Quote
Try remote lead from headunit to amp. My sub makes this crackling noise your describing because the conection isnt great.
Jamie
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Registered: 1st Apr 02
Location: Aberdeen
User status: Offline
18th Oct 04 at 15:15   View User's Profile U2U Member Reply With Quote
Checked remote wire from headunit to amp, its fine

Earth looks fine, all been in car 12 months.
Martin
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Registered: 15th Mar 04
Location: Dumpstable Drives: Aztec Sxi
User status: Offline
18th Oct 04 at 15:26   View User's Profile U2U Member Reply With Quote
you got any 6x9's or another sub you can conect up to the amp. See if they make the same noise? This'll show if the problem is in the sub.

 
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