Product Code: 27217 Price: Check Latest ORION HP Series HP-12D4  12" subwoofer HP Series 12" 1000 Watt Dual Voice Coil 4 Ohm Subwoofer Orion High Performance (HP™) that’s who! HP takes raw power to a whole new level, with machine-turned die-cast aluminum baskets and powerful Open Loop motors that utilize a vented hybrid magnet structure which dramatically increases airflow through the speaker. Open Loop speaker technology keeps the HP-Series subwoofers running cool even under the most demanding SPL situations. Fs (free-air resonance, Hz) 26.15 Vas (equivalent compliance, cu. ft.) 2.095 Vas (equivalent compliance, liters) 59.33 Qms (Q, mechanical) 4.66 Qes (Q, electrical) 0.48 Qts (total driver Q) 0.44 Re (DC resistance, ohms) 6.77 Z (nominal impedance, ohms) 2.8 Le (inductance, mh) 2.57 Efficiency (1W @ 1M, dB) 85.32 Xmax (one way linear excursion, in.) 0.67 Xmax (one way linear excursion, mm) 17.19 Pe (continuous power handling, watts) 500 Peak power handling (music, watts) 1000 Mms (total moving mass, grams) 216.26 Cms (mechanical compliance, mm/N) 171.32 Bl (motor strength, Tesla-M) 22.32 Sd (effective radiating area, sq. m.) 0.05 Sd (effective radiating area, sq.in.) 76.88 Frequency range (Hz) 30-2.5k Energy Bandwidth Product (EBP) 54.23 Model Number P12D4 Mounting hole diameter (inches) 10.95 Mounting depth (inches *) 5.25 Basket diameter (inches) 12.45 Model Number P12D4 Typical sealed enclosure (cu. ft.) 1 SPL sealed enclosure (cu. ft.) 0.7 Low Qtc sealed enclosure (cu. ft.) 2.5 Vented enclosure (cu. ft.) 2 Port tuning frequency (Hz) 40hz Port diameter (inside, in.) 4 Equivalent square port (in.) 3.54x3.54 Port length (in.) 7.44 1. External dimensions calculated for 3/4" building material 2. Includes port and speaker displacement 3. Volumes given are net tuning volume