I just installed a 910 and all speakers worked fine. The install instructions said to reset unit after install. After I did the reset on the unit I lost all sound from my rear speakers. I have the front speakers wired direct from the headunit. The rear speakers are wired from the rca preamp outputs to an amp and then to the speakers. I assume that the reset turned the preamp outputs off. I can not find an option to turn them back on in any of the menus. I believe there is a hidden/advanced menu with this option. Does anyone know how to access the hidden menu or can offer any advice on my problem. Thanks Dave M

Just figured out the problem My own dumb mistake. I didn't have the wire to turn the amp on connected properly due to a previous install of a diferent head unit by some one else. All well that ends well.