carstereo says: The online community for car audio beginners, enthusiasts and professionals. ... Kenwood KAC-8103D - decent amp, good price. Kenwood Excelon - KAC-x10d. ...see more

crutchfieldcanada says: Kenwood built the KAC-8103D amplifier from the ground up to power your subs with authority...A built-in low-pass filter adjusts amplifier output so you'll get the best sound possible from your subwoofer/box combo, while the subsonic filter eliminates inaudible, ultra-low bass that can detract from your sub's performance...The top-mounted controls allow you to tweak the sound easily, and convenient front-side connections make setup a snap...see more

forums.genvibe says: The Online Community for Pontiac Vibe & Toyota Matrix Enthusiasts ... Now the the subs and the KAC-X20 1000watt kenwood amp(as I suppose here), I've ...see more

rss.epinions says: Kenwood KAC-959 Car Audio Amplifier: Short Shelf Life. Kenwood KAC-X40 Car Audio Amplifier: Solid choice for beginner or experienced audiophile ...see more

community.crutchfield says: 3.5 cu ft would be good, tuned to the low 30's, 32hz is a good choice...I saw that there is a slot ported box available here on Crutchfield, with a total of 3.5 cubic feet (1.75 per sub) which is what Alpine recommends for volume......In my personal opinion, you would probably only gain a decible or two- not worth it to me (considering I never really reccommend going over the manufactors rms values, <50 watts isn't too bad, but it is never a good idea to go over...see more