inputs.text: great price not alot power - notice specs rated 144 volts perfect conditions no ones car runs voltage cleanly consistently time take account temperature humidity length wires quality power wire etc get much lessreally cars alternator puts 130 138 best reality playing amp 130 138 volts sometimes 12 volts heavy loads instead 500 watts getting 350w amp overrated least rated unrealistic expectations also amp not run 4 ohms 2 ohms heat shut match 4ohm sub thats rated 300400 watts youl happy cheap price helps make complaints got extra cash go real amp like jl 5001 10001 reliable performance consist output across varies voltages ohmsupdate july 3 2013after model several times kenwood models opinion still stands get solid 350400 watts unit pair 4ohm subwoofer power range