had a guy come in with these b4. he had 4 in a ex cab chevy. on a hifonics brutis 2000w and it was pretty loud but it was a ghetto install and he also said they were reconeable but i looked and couldnt find that they are. but i havent got to play with them so im not sure. but i have 1 18 lvl4 in a focus hatchback on an audioque 2200 and mine was louder haha. but they did seem ok