i hardly hear anyone talk about kenwood amps are they good bad or just decent or are they in that catagory of lanzar boss sony etc. i have a KAC-8402 which is 60w x 4 and it is powering my 4 infinity kappa 5 1/4 speakers. mainly im just wondering if i will notice a big difference if i went with a better amp such as JL or kicker but not limited to those brands as i am just throwing them out.