inputs.text: great sound good price - got radio camaro 1998 replaced dual hd radio head reviews keep talking time correction adjustments well case partially successful setup 2 polk door speakers custom airtight fiberglass boxes 2 rear polk speakers reproduce excellent accurate deep bass thump thru chest without subwoofer thanks cars rear speaker placement position equalizer works great bluetooth works great clear kce400bt adapter mixed results time correction adjustments following directions time correction manual noticed right away center sound move center mid hi range negatively affected bass rear speakers mid bass gone no time correction tweaks able fix suspect delay caused elimination bass standing wave frequencies produced speakers work phase no individual speaker delay standing wave makes bass really pronounced inside car since dont sub unacceptable left time correction front speakers since dont produce deep bass due enclosure size reset rear speaker correction 0 bass came back right away way listen music adjusting delay cool see effect right away suspect sub may would overwhelm rear speaker loss base aware time delay correction cause negative side affects well end money excellent piece equipmentupdate july24 2012installed class amp 8001200w 12\\ sony explod woofer got home theatre setupconnecting sub amp alpine easy menu settings adjust bass level setup base mode bass automatically increased main volume low sounds good really no complaints alpine controls really tune radio liking use bluetooth radio time well usb memory flash playback works well one complaint alpine idea separating music bank 1 2 3 odd not intuitive done takes time find right folder usb card play figure bank folder looking