I have had this amp for some 6 months now and have come up against a slight problem, so hopefully someone can help. The sub woofer output all of the sudden has gone incredibly low. There seems to be two possibilities for this (the sub is fine as i have tested it with a spare amp)... a) the amp is cream crackered b) i have accidentally changed some settings on the amp. I have had a look through the settings and they all appear normal, but assuming I have changed something has anyone got any advice on where I should look in particular? Also I have been trying to reset the amp which according to the instructions is achieved by pressing 'Tone' and 'Standby' for 3 seconds until 'Reset' appears. This doesn't appear to work so does anyone know anything different?