I installed these speakers in a 2005 Toyota tundra, replacing the oem speakers and retained the oem JBL radio. First, there is an immediately noticeable drop in volume. Sensitivity is rated at 91 db, not the best, nor the worst. The highest I have seen is 93 db, for at least twice the price. Second, the sound quality took a dive. At low volume the base can be heard, mid and treble are muted, at higher volume the mid range blasts out past the base and treble. Heck, the treble is now turned to max and it's way in the back ground. These speakers are not linear at all. I was hoping for a small bump in performance but instead I am living with a sound quality that is actually lower than what the paper coned, plain jane, oem speakers delivered. Even if I put an amp in, I think these speakers would still sound like S#&T.