So I started with a small pilot hole and stuck my hand up under the dash till i felt the bit to make sure nothing was in the way. There is what feels like a hvac plastic box/line in that area you want to avoid. I ended up using step bits so I didn't accidentally drill too far down. I also made...
The next audio upgrade on my list is the powerbass front door speakers and install some sound deadening. If that makes a good improvement I will do the rear doors.
I am actually blown away with my build. I have upgraded audio on most of my vehicles and have done two custom sub installs. This is a huge improvement from factory.
Does your amp have a control knob? Or have you messed with the settings at all since the install?