In a Grand Prix it's hard in general to get high SPL cause there's alot of space to move. Are you suggesting the only way to get it is a pure SPL system? cause I'm wanting a heavy hitting daily, not some burping crap.
Edit: I'm not trying to seem like some know-it-all kid trust me, but I know for a fact that a wall can be musical. And theres little other way's IMO to get those high SPLs without breaking my bank. I know for a fact theres a guy getting 159's in a GP, but heres the thing its 2 10's at 13k Watts. I'm on a budget man c'mon.
