This is my first post. I just bought a 2013 TRD Sport with the touchscreen head unit. The sound sucked, so I visited my local stereo shop for upgraded speakers and amplifier. When I went to pick it up, an amazing amount of hum was audible through the speakers when the key is on and the stereo off. Rockford Fosgate amp and Hertz HSK 165 speakers. Had them swap the amp to a low noise variety, but 12 hours of labor later they told me the HU never really shuts totally off, and in order to get rid of the amp noise, I either have to swap out the HU or install a toggle switch for the amp. Has anyone else experienced this? Any leads or ideas on which direction I should go? I really would like to keep the stock head unit, as it is easy to operate and is nicely integrated with Bluetooth, phone, etc., but the hum is driving me crazy!
Thanks in advance.