Model XTR-250D2 Size 275mm ( 10" ) Power handling (RMS/Peak) 600/1200 W Nominal impedance 2 x 2 Ohm Mounting depth 154 mm Mounting diameter 234 mm Magnet weight 160 oz Voice Coil diameter 63 mm ( 2.5" ) Voice Coil Type/Material DVC / BASV Weight 10.8 kg Voice Coils connection series parallel Impedance 4 Ohm 1 Ohm Fs 33.5 Hz 34.1 Hz Vas 18.4 L 18.9 L Qts 0.319 0.378 Qes 0.355 0.416 Qms 3.142 4.085 Xmax (lin/peak) 10/20 mm 10/20 mm Re 3.4 Ohm 0.85 Ohm Mms 184 g 184 g BL 19.56 TM 8.84 TM SPL (1W/1m) 84.8 dB 84.6 dB Box suggestions Closed box 15-20 L Bass-Reflex box - Car / Hifi 35 L + 3 " putki / length 21cm Tuning frequency 35Hz Bass-Reflex box - Car / Loudmusic 30 L + 3" putki / length 18cm Tuning frequency 40Hz Bass-Reflex box - Home Theatre 40 L + 3" putki / length 26cm Tuning frequency 30Hz