Amplifier/Sub enclosure draining battery?

Hey guys need help with my car (Honda Integra 97).
So i have a Amplifier/Sub enclosure (Fusion 750w) and iv'e had it for 5 months and just this month its started to drain my battery flat i figured out the power drain is from the amp/sub so now i'm always pulling out the fuse from the power wire when i turn the car off and when i go for a drive in i put the fuse back in…

i've measured the voltage when the fuse is out of the power wire and its at.02 v or something but when the fuse is in it stays at 12.32v i don't know what to do.
the things i've tried is
taking the wires all off and rewiring checked the fuses.
any help would be great. Thanks.

(the amp is off there's no light indicating its on but it still draws that 12v when the car is off and no key is in ignition sorry if i sound so noobish)
(the amp is off there's no light indicating its on but it still draws that 12v when the car is off and no key is in ignition)

I think you just need to fit a $1 switch in the power feed to the amp! It will be a 'Master-switch' for the amp.

From the start, I'm skeptical that the sub/amp is the cause.
Measuring voltage at the amp terminals does not indicate the amp is drawing anything from the electrical system. The amp's power wire is just an extension of the battery (+), so if you meter that and any point of ground you' should see around 12.5v. The amp doesn't draw current until the remote turn on triggers.
How old is your battery?
They don't last forever. 5 yrs or so would be considered a typical life span.
The fact that you're only measuring ~12.3 at rest indicates the battery is probably not very healthy regardless of your audio system.
Most of the chain auto stores will do an electrical system check for free. Only takes a few minutes. Just stop and ask.

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