inputs.text: improvehement stock hu - 2012 subaru impreza stock hu polk mm651 front door coaxials cdt cl6ex rear door coaxials kicker 11hs8 underseat sub subarukicker upgrade indash tweeters amp need drive door speakers loud enough little distortion gain set 40 amp maxes around 33 40 hu volume control still sounds cleanone big tip run new ground using factory harness ground give lot alternator whine least