I bought a RSX type S with bose and the previous owner had a Alpine ina-w900 HU put in professionally. It's using all the stock speakers and sub. When I turn the Sub on and off in the HU setup, there is no difference. The Sub always stays ON. Should I not be able to turn it off? There is...

Just put this in the other day.... Wicked unit! Besides built in nav, I've added the PXA-H100 Imprint module, KCE-400BT Bluetooth module, Sirius tuner and of course iPod. It's a very easy unit to operate, it has variable illumination including red to match our dash lights, picture in...