i bought these speakers as a replacement for the factory speakers in my 94 caprice. i was running them directly from my alpine 9853 head unit but the sound started to deteriorate after about a year. i decided to purchase alpines mrp-f450 amp for them pushing 70 watts to each. without the gain on the amp not even in the normal position, these speakers came back to life and then some. i switched the head unit from the 9853 to the 9855 and that made a huge difference too with the higher voltage pre-outs...i was even issued a citation for noise ordinance violation with this setup (no subs, just 4x6 type s speakers up front and these in back all hooked up to the amp). after running this for about 2 months like this, i ended up blowing one of them. i have 3 way kappas now and the bass on those doesn't come close to the bass on these after i amped them. i would recommend these to anyone who doesn't want subs but is willing to install an amp. if i could do it all over again, i'd buy these and amp them right away. i'm sure they would have lasted longer. great speakers if you've got an amp and already have the treble taken care of.