Some of them do come with built in amps. some don’t. I have had an older 6.5" 100 watt amplified for about 8 years. It has been in all of my vehicles thus far, it sounded the best in my Regular cab S-10, okay in the extended cab S-10, shitty in the jeep and Legacy wagon. It really depends on the placement in the truck whether it will sound good or not so play around with it.