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C30 / S40 & V50 '04-'12 / C70 '06-'13 General Forum for the P1-platform C30 / S40 / V50 / C70 models |
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Aftermarket subwoofer remote powerViews : 592 Replies : 2Users Viewing This Thread : |
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Nov 16th, 2020, 01:38 | #1 |
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Last Online: Sep 26th, 2021 22:38
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Aftermarket subwoofer remote power
Hiyya,
So much like the title says, I've previously installed an aftermarket subwoofer on my V50 -04 (using a high-low signal converter and a lot of tweaking around), but finally got it to work. Our plan was to hook onto the rear light cable to provide the subwoofer with a remote signal, which seems to work when the key is in the 2nd position in the car (Lights go from OFF to ON), but once we start the car, it loses the signal (Lights have at this point gone from OFF, to ON, to OFF, to ON as they do when starting the car). The fix wasn't much more painful than hooking it onto a switch and having the switch in the cabin of the car, but it is getting cumbersome. Local technicians say there are no other options with these cars, but I were wondering if anyone here have any general ideas? The car does NOT (to my knowledge) have the large audio package and as such no "built in" subwoofer. |
Nov 16th, 2020, 08:46 | #2 |
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Last Online: Today 11:39
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Hello.
Most subs are negative switched which I think could be why you are getting strange results. Basically this means you ground the switch wire to turn the sub on. I think what's happening is your switch wire is grounding through the bulbs, when the bulbs are on there is voltage which turns the sub off. Some subs allow you to change the switching polarity to positive, worth a look to see if you have one with this feature. You could fit a switch or a more elegant solution would be a small signal relay. This could be used to connect the sub switch wire to ground when power is applied to the relay from whatever circuit you choose eg the lights. You only need a small relay, you don't want anything that draws significant current from the circuit it is connected to and you MUST fit a diode in series with the relay coil. If you don't do this part you risk damaging the circuit used to power the relay. |
Nov 16th, 2020, 14:01 | #3 | |
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Last Online: Sep 26th, 2021 22:38
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12v, aftermarket, power, remote, subwoofer |
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