hea soundsystems hhr

My name is Jon and I own hea Soundsystems in northern Nevada. A thread about deep bass tracks got my attention since I am always looking for new material to play in my car. I drive a 2006 Chevy hhr, and I currently have 3 18" level 6 dc audio subs in the back, tuned to around 23 hz. Dc 7.5k amp...