My SPL Contest System
	My Competition System At Jakarta Merah putih Competition Head unit : Pioneer P-8850  CD Changer: Pioneer P-1250  Preamp : Orion Pmq 500  Power : Soundstream reference 1000s  Sub Woofer : Crosfire DB 12 DVC x 4  Spl Reached :152.9 Db  Box type : Ported with ten 3 inch PnR ports  Ported at 47 hz with 12 cubic feet total volume.