A friend of mine has a 2001 Neon with a single Bandpass Swiss Audio 10 inch sub (300w max) powered by a Kenwood KAC-5201 (250w max).
We switched his box with 2 sealed GNX 124 subs and he loved the sound. We noticed that the amp was turned down all the way, so we bumped it the gain up to half way.
Now here is where it gets really wierd.
He turned his deck "off" by mistake, and a really loud bass noise came from the subs. We turned the amp back down to where it was, and the noice dissappears. What is more wierd is when we have the deck "off" and the amp up, if we walk away from the car, the noise stops, but if we get close, it comes back...and if we actually touch the subs with our fingers, it stops. All this happens when the deck is "off" and the amp turned up just a little over 20%. When it is "on", it sounds great and works perfectly fine.
He only has a factory deck, so he is using a highlevel input from his back speakers.
Does anybody have any idea what is going on?