Incredibly linear frequency response characteristics, extreme high power handling while generating the lowest harmonic distortion of any comparable 15-inch transducer within its application range. The L15P400 uses a fiber loaded cone assembly along with a high excursion triple roll surround. This combination provides remarkable strength and a peak to peak maximum excursion of 52mm. The T-pole also features RCF Precisions spaced gap demodulation technology, progressively braking the voice coil, providing a much smoother transition for the moving mass as it reaches its maximum excursion limits. Forced air venting system. 4-inch, fiberglass inside/outside copper voice coil1600 W continuous program power handling97 dB Sensitivity30 Hz – 1.5 kHz Frequency rangeAluminum demodulation ringForced air ventilation and 14 mm top plate for minimum power compressionDual spider design with silicon based dampening controlTriple-roll surround and corrugated straight cone geometry SPECIFICATIONSNominal Diameter: 15 inch / 381 mmProgram Power: 1600 WSensitivity: 97 dBEffective Piston Diameter: 240 / 13.39Minimum Impedance: 6.3 ohmsVoice Coil Winding Material: CopperNumber of Layers: 2Top Plate Thickness: 14 mm / .55 inchSurround Material: PolycottonMagnets: CeramicSpider Dual: With silicon based damping controlRated Impedance: 8 ohmPower Handling Capacity: 800 WFrequency Range: 30 - 1500 HzMax. Excursion Before Damage: 50 mm / 1.97 inchVoice Coil Diameter: 4 inchVoice Coil Length: 23 mm / .91 inchKind of Layers: Inside / outsideCone Design: StraightSurround Design: Triple rollDual-Force Air Ventilation: Yes Thiele - Small ParametersResonance Frequency (FS): 36 HzMechanical Factor: 7.50Total Factor: .25 QtsEffective Moving Mass (MMS): 150 GEffective Piston Area (SD): .09 m2Voice Coil Inductance at 1 KHz (LE1K): 1.20 mHDC Resistance (RE): 4.8 ohmElectrical Factor (QES): .27 QesBL Factor (BL): 24.8 T x mEquivalent Cas Air Loaded (VAS): 160 litersMax. Linear Excursion (XMAX): 8 mmHalf-Space Efficiency (EFF): 2.6 % Mounting InformationOverall Diameter: 393 mm / 15.47Bolt Hole Diameter: 7 mm / .28 inchRear Mount Baffle Cut-Out: 360 mm / 14.17Bolt Circle Diameter: 371-376 mm / 14.61-14.8Front Mount Baffle Cut-Out: 352 mm / 13.86Volume Occupied by the Driver: 4.3 liters / .17 ft Standard ComplianceCE Marking: Yes SizeWeight: 13.5 kg / 29.76 poundsDiameter: 393 mm / 15.47 inchesHeight: 159 mm / 6.26