does all tune their boxes under 38hz, if you only want to play high so tune higher! maybe he wants to go for pure spl? if so, the first thing to do is check the cars own frequens, and after that, build a box and tune it after the car. so yes, the main thing is in the box, but the car helps a lot too.. a small car is much more easy to play high in if you compare to those suvs all drive in us..
