Subwoofer kicking off at low volumes

[hunds02]

Hello,

I have a problem I have been facing for almost a year, I know its audio related but I wanted to post it here since not a lot of people view the mobile audio forum. Basically sub stops playing when volume is too low. When volume increases it kicks on and stays on for about 45 seconds after volume is decreased. Will stay off until volume increases again.

This is what I realized after checking it and troubleshooting it today:

I went to check it again, it seems as its the sub not being able to play at low volume NOT the Amp. The amp always stayed on (blue light illuminated) even when the subs stop playing. Voltage reading from PWR to GND was 14.18V and from REM to GND was 14.02V. So a very tiny difference. When I checked it just now, it seem as if the sub was playing at low volumes longer without shutting off, (I actually thought I fixed it!), but eventually it kicked off. Also I think when a heavy-bass song plays is when it usually kicks off, as if the volume was too low to kick on the sub for a loud bass note.. if that makes any sense. Also I have a circuit breaker, not an in-line fuse

So i am assuming the amp is still good, but maybe the sub is bad? The sub is underpowered, not sure if that will damage it. Amp is rated at 1100W but I have it wired in series, since the sub is a dual 4 ohm voice coil, I believe the load under series is 8 ohms. So basically 8 ohm load from a 1100 W amp powering a 2000 W RMS sub.. maybe that has something to do with it... but then again its been wired like that for years and there was never any problem..