ive just bought the alpine 9855r headunit.
there should be a setting to change subwoofer output from stereo to mono, however, its missing from my headunit.
Instructions tell you how to get to the setting, but it seems to be missing?
anyone knows whats up?
Have you checked EVERY menu? LI.e.. press menu and glide along to the right past the normal settings too? And is there not another menu you get after holding in the menu button for ages to do with the crossover? I have this headunit but can't remember off the top of my head.