I have a 9830, when I had it installed firstly (free installation) the installer did all the settings himself. He made it as loud as possible without being too distorted. Though, now someone hit the reset button on my head unit, so I have no clue how to make it loud with my subs like before. It used to be loud with my subs without using the MX function, and now the only way I can make my subs decently loud is using the MX function... that wouldn't be a problem except that it sounds distorted when I use MX and the subs are up in volume. Any help on the hz or frequencys or hi pass or low pass or anything to help my subs pound with this headunit?