I have an aftermarket ken wood deck and ken wood speakers all around. When I got it all hooked up I would listen to it on about 18 and that was loud for me. Before I go any further, don't think I'm stupid but I doubt I'm just going deaf or something... I added two 10"s and a 300 watt amp, runs off my truck battery with an inline fuse. Since then I've had to listen to my music on about 23-26 volume level. This is with the subs off, like when I listen to country or anything I dont what bass in. Now with the subs all the way up 16-18 makes my truck shake. Im stumped. I guess my question is, is my truck not giving as much power to the speakers now so I have to turn it up more or am I just really dumb/paranoid? Sorry if that was confusing guys. It was hard to word.