GZHW 16SPL – Hydrogen 6.3? SPL Subwoofer. 6.3? High quality SPL subwoofer with alumiunum cast basket and reinforced paper cone. 6.3? High quality SPL subwoofer. Long stroke compound surround. Solid aluminum cast basket. 50 mm / 2? Copper voice coil. IMPP dust cap with 3D structure logo. 16 cm / 6. 500 / 1000 Watts. 400 – 1000 Watts. 50 mm / 2 copper.