i havent used a jbl before but i dont know about that.. i like mtx amps but they **** as far as setting up cus they have no indicators on the knobs as to what frequency or level you are at really.. i mean it doesnt take a genius to get an estimate but still, thats one of there faults.. i guess they just dont want to spend the money to invest in custom knobs and what not.. still though there amps are pretty expensive if you buy them retail.. and they dont come with some of the extras that other amps come with like bass nobs and subsonic filters built in.. as far as pure performance they are good though.Sound quality would probably be better since MTX amps are easier to work with ... JBL amps are kind of annoying to set up ...