Hey guys I installed a pbr300x4 amp and rockfords power 6.5's. I'm still using the stock hk radio. They are nice and loud and clear but no bass at all. I'm not looking for a lot of bass but I think a little will help. There isnt a way to adjust the stock hk is there? I will most likely put an aftermarket deck in but just looking to see if I can get a little more out of it.