– High power 15” SPL subwoofer – Klippel® optimized – Efficient triple magnet – Massive aluminum cast basket – Reinforced paper cone – 3” copper voice coil – High-Roll sandwich surround – Double spider – Also available as Gold and Green edition Technical data *Describes the subwoofer’s ability for each kind of use. ☺ = Good ability ☺☺☺☺☺☺ = Excellent ability Model – GZHW 38SPL Diameter – 390 mm / 15.35“ Mounting diameter – 360 mm / 14.17“ Mounting depth – 231 mm / 9.09“ Voice coil – 75 mm / 3″ copper Cone – Reinforced paper Power Handling – 3500 W SPL Power Impedance – 2 x 1 Ohm SPL – 87 dB Xmax – 45 mm / 1.77″ Fs – 36.3 Hz Qts – 0.52 Vas – 32.84 L / 1.16 cu.ft. Sound Quality* – ☺☺☺☺ SPL Competition* – ☺☺☺☺ Low bass performance 20 – 50 Hz* – ☺☺☺☺☺ Mid bass performance 50 – 80 Hz* – ☺☺☺☺