If your car amp is drawing power when off, then you will need to learn how to fix your car amp that keeps draining the car battery. The last thing you want is your car battery to be dead in the morning when you're just about to set off for work. The main cause to a car battery draining overnight is the blue remote wire is not connected correctly to your car amplifier. The blue remote wire is a wire attached onto a terminal onto the amp labelled as 'remote'. The main role of this wire is to send a signal to power on the car amplifier when the car stereo is switched on via the cars ignition system.
Chances are that the blue remote wire from your amp is connected to a constant live source causing a constant battery drain. On an aftermarket radio, you will see a blue wire labelled as 'amp turn on' the remote wire should be connected to this and not to the yellow wire on the back of the radio. Aftermarket radios support aftermarket car audio amplifiers, so they will have the correct wire.
If you have used an RCA converter to get input signal to your amp and have connected the remote wire to a cigarette lighter wire or fuse box via a fuse tap, you probably wired it to a constant feed that is always powered on with the car. You will need to use a test light or an multimeter to locate which fuse in the fuse box goes off and on with the key. Then remove the existing car fuse, add it into the fuse tap and add a second 5 amp fuse for the remote wire connection and crimp the blue remote wire onto the red wire from it. This will give your car amplifier a circuit that will tell it to go off and on with the key input. A common question we get asked if will a capacitor keep my battery from dying. The answer is no and power cap acts as a reverse back for emergency power when the car amp needs it for heavy bass songs. It is not there as a second battery and only helps support the electrical system when the car is switched on.
So, does a subwoofer drain a car battery? Well no, if the car amplifier is installed correctly it will shut off when the ignition goes off. If you have a really powerful car amp, such as a 2000 watt amp your stock battery will find it hard to keep up with its massive current draw. Overtime, this will kill your stock battery and also maybe your alternator. I always recommend that you get a deep cycle battery such as a yellow top opima battery or an XS power battery.
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