JL amplifiers are very nice. I have never used the 300/4, but I have a couple of 300/2s right now. I think they are great SQ amps, but I doubt they are the best. Best for that price range maybe, but if you really want the best, I would probably look at brands like Zapco, Sinfoni, Tru Technology, etc. But those may cost well over $1000 for an equivilent amp.