amyjdcorsa
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Registered: 28th Mar 09
User status: Offline
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got sub in car and its all wired up as it should be but theres one problem. when i take keys out of ignition sub makes a loud bass noise only way to stop it is to turn stereo back on. any ideas wot could be
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Root
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Registered: 28th Dec 08
User status: Offline
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Same has happened with mine in the past, when I put my hazards on, the sub makes a bass sound with the hazards blinking. Havn't got a fucking clue though mate...SOMEHOW the amplifier picks up on these noises and reflects them in the subwoofer....how though? I havn't got a fucking clue, as long as you can blast noise out and deafen yourself within 5 years, who cares? 
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sampayne21
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Registered: 3rd Sep 08
Location: Sidcup Kent Drives: BMW E46
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make sure you havent run, the power cables and phono leads down the same route
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3lfz
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Registered: 16th Nov 08
Location: Torquay
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Interference with the cables.
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Dan H
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Registered: 27th Nov 08
Location: Stockton-on-Tees
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mine does the same when i take my keys out, i think its just 'cos it takes a while for the power to be cut to the subs so it makes a thud. used to do the same when i had a switch in the circuit, nothing to worry about
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Root
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Registered: 28th Dec 08
User status: Offline
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quote:
Originally posted by --DannyH2k9--
mine does the same when i take my keys out, i think its just 'cos it takes a while for the power to be cut to the subs so it makes a thud. used to do the same when i had a switch in the circuit, nothing to worry about
mine does that too..but think about the logic behind it, how on earth does the amplifier pick up on the fact you've taken the key out of the ignition, it's just bizarre.
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12vMatt
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Registered: 28th Oct 06
Location: Sunderland
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quote:
Originally posted by Root
how on earth does the amplifier pick up on the fact you've taken the key out of the ignition, it's just bizarre.
the blue remote wire from the headunit sends a signal to the amp - once the ignition is off/stereo is off then the amp tuns off
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Dan H
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Registered: 27th Nov 08
Location: Stockton-on-Tees
User status: Offline
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yeah what 12vMatt said. one you take your key out of the ignition you are cutting the power to your amp, and there is always a delay of power reaching the amp, so the key will out of the ignition and then there will be the amp picking up that there is no more power goin to there and will switch off and make a thud noise. when ya have a switch for your amp in the car if ya switch it on there is a delay before the subs come on, there always is, its just 'cos of how long it takes to get the power from the battery and HU up to the amp.
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Root
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Registered: 28th Dec 08
User status: Offline
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quote:
Originally posted by --DannyH2k9--
yeah what 12vMatt said. one you take your key out of the ignition you are cutting the power to your amp, and there is always a delay of power reaching the amp, so the key will out of the ignition and then there will be the amp picking up that there is no more power goin to there and will switch off and make a thud noise. when ya have a switch for your amp in the car if ya switch it on there is a delay before the subs come on, there always is, its just 'cos of how long it takes to get the power from the battery and HU up to the amp.
ok ay then mr. smarty pants, what about when it thuds while my hazards are on? lol
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craig8
Premium Member
Registered: 31st Dec 04
Location: Glasgow
User status: Offline
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the thumps, either when switching off or with the hazards are caused by the speaker cables being run next to power cables and causing interferance, its got nothing to do with how long it takes for the remote wire to show the cd player is off
E36 328
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Dan H
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Registered: 27th Nov 08
Location: Stockton-on-Tees
User status: Offline
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quote:
Originally posted by Root
quote:
Originally posted by --DannyH2k9--
yeah what 12vMatt said. one you take your key out of the ignition you are cutting the power to your amp, and there is always a delay of power reaching the amp, so the key will out of the ignition and then there will be the amp picking up that there is no more power goin to there and will switch off and make a thud noise. when ya have a switch for your amp in the car if ya switch it on there is a delay before the subs come on, there always is, its just 'cos of how long it takes to get the power from the battery and HU up to the amp.
ok ay then mr. smarty pants, what about when it thuds while my hazards are on? lol
could be some dodgey wiring behind the dash? whip out your centre console and have a look at the wires see if there is anything that looks dodgey? like wires cut and re-joined. must be cutting power through the hazzard wiring or something somehow. never had it happen to my car or any of my mates cars that i have wired up.
Craig8 the thud is nothing to do with interferance, intreferance with the subs/amps is a high pitched sound that is also called "alternator whine" (sp) we have it in my mates focus, took the who wiring out and re-wired the whole sound system and we still get it, even with all the little gadget things. interferance comes from when a power cable of some sort is near the RCA's /speaker cable, there wouldnt be a thudding sound.
i could be wrong but im 95% sure im right about it lol 
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Root
Member
Registered: 28th Dec 08
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it's nowt to do with the wiring being chopped or owt as it's all fine
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craig8
Premium Member
Registered: 31st Dec 04
Location: Glasgow
User status: Offline
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quote:
Originally posted by --DannyH2k9--
quote:
Originally posted by Root
quote:
Originally posted by --DannyH2k9--
yeah what 12vMatt said. one you take your key out of the ignition you are cutting the power to your amp, and there is always a delay of power reaching the amp, so the key will out of the ignition and then there will be the amp picking up that there is no more power goin to there and will switch off and make a thud noise. when ya have a switch for your amp in the car if ya switch it on there is a delay before the subs come on, there always is, its just 'cos of how long it takes to get the power from the battery and HU up to the amp.
ok ay then mr. smarty pants, what about when it thuds while my hazards are on? lol
could be some dodgey wiring behind the dash? whip out your centre console and have a look at the wires see if there is anything that looks dodgey? like wires cut and re-joined. must be cutting power through the hazzard wiring or something somehow. never had it happen to my car or any of my mates cars that i have wired up.
Craig8 the thud is nothing to do with interferance, intreferance with the subs/amps is a high pitched sound that is also called "alternator whine" (sp) we have it in my mates focus, took the who wiring out and re-wired the whole sound system and we still get it, even with all the little gadget things. interferance comes from when a power cable of some sort is near the RCA's /speaker cable, there wouldnt be a thudding sound.
i could be wrong but im 95% sure im right about it lol
that was one of the main things it would be when i was fitting ICE, the other cause of it is usually a bad earth, check and make sure these are bare metal and have a good connection
E36 328
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Dan H
Member
Registered: 27th Nov 08
Location: Stockton-on-Tees
User status: Offline
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quote:
Originally posted by Root
it's nowt to do with the wiring being chopped or owt as it's all fine
dunno what it could be then bud. easier option? dont put hazzards on lol 
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