KENWOOD PS-series 25cm subwoofer

General: X-Motif Cone with Diamond Array PatternThe newly designed X-Motif [A] Cone not only adds strength to the cone but also controls resonance frequency and cuts unnecessary frequency, delivering powerful and solid bass response. The Diamond Array Pattern [B] enhances sound and reduces distortion.Airflow Control & optimized heat dissipation The Close Yoke Design [A] has a strong magnetic circuit with the purpose of reproducing deep low frequencies and optimized heat dissipation.The combination of the Heat-resistant Alminum Bobbin [B] that provides higher thermal conductivity and the Newly-designed Airflow Control [C] that cools the voice coil when air passes through, ensure the efficiency and longevity of the subwoofer.Computer-optimised spiderThe Computer-Optimized Spider has a redesigned shape to equalize the stress to achieve very high levels of linear travel and increase mechanical durability. Key Features - Feature-0: 250mm Polypropylene Cone (PP Cone) Key Features - Feature-1: 400 Rated/RMS Input Power Key Features - Feature-2: High-ridged Two-piece Diaphragm for solid bass Key Features - Feature-3: X-motif cap Technology for resonance control Key Features - Feature-4: Single, multi-layered, voice coil. Key Features - Feature-5: Aluminum bobbin for better thermal conductivity Key Features - Feature-6: Airflow control for optimal heat radition Key Features - Feature-7: Stress controlled spider Key Features - Feature-8: Push-terminals for easy connection Key Features - Feature-9: Sealed/Ported installation capabillity Speaker Features - Speaker Size: 250mm Speaker Features - Oversized Dimension: Yes Speaker Features - Speaker Cone Design: Diamond-Array pattern Speaker Features - Magnet Type: Ferrit Speaker Features - Voice-coil: single, multi-layer voice coil Speaker Features - Terminals: Push Type Speaker Features - Spider: Stress controlled spider Speaker Features - Bottom-Yoke: Fully closed bottom yoke Speaker Features - Heat dissipation technology: Airflow control Speaker Features - Installation Capabillity: Sealed / Ported Speaker/woofer Specifications - Peak Input Power: 1300W Speaker/woofer Specifications - Rated Input Power: 400W Speaker/woofer Specifications - Woofer Cone material: Polypropylene (PP) Cone Speaker/woofer Specifications - Center Cap Type: x-motif cap Speaker/woofer Specifications - Spider Type: Stress controlled Spider Speaker/woofer Specifications - Speaker Basket: Steel Speaker/woofer Specifications - Speaker Surround: Foam Speaker/woofer Specifications - Sensitivity: 85dB/W/m Speaker/woofer Specifications - Frequency Response: 33Hz ~ 300Hz Speaker/woofer Specifications - Speaker Impedance: 4Ω Speaker/woofer Specifications - Dimensions (W x H x D): 275 x 275 x 142.2mm Speaker/woofer Specifications - Mouting Hole Diameter Ø: 230mm Speaker/woofer Specifications - Mounting Depth: 124mm Speaker/woofer Specifications - Speaker Weight: 4000gr Subwoofer Parameters - Nominal impedance (Z): 4Ω Subwoofer Parameters - DC resistance (Re): 3.7Ω Subwoofer Parameters - Resonant frequency (FSO): 33.7Hz Subwoofer Parameters - Mechanical Q factor (QMS): 6.95 Subwoofer Parameters - Electrical Q factor (QES): 0.554 Subwoofer Parameters - Total Q factor (QTS): 0.513 Subwoofer Parameters - Voice coil inductance (LBM): 1.9mH Subwoofer Parameters - Voice coil diameter (d): 50mm Subwoofer Parameters - Force factor (BL): 13.2T/m Subwoofer Parameters - Peak excursion Xmax: 5.9mm Subwoofer Parameters - Moving mass (MMS): 124gr. Subwoofer Parameters - Volume accoustic compliance (VAS): 31.9liter Subwoofer Parameters - Piston Area (SD): 0.0512m² Subwoofer Parameters - Displacement: 0.9cc Subwoofer Parameters - Sealed box volume: 18.4liter Subwoofer Parameters - Sealed Box Dimensions: 375 x 324 x 229mm ( 18mm thick MDF)(WxHxD) Subwoofer Parameters - Vented box volume: 25.5liter Subwoofer Parameters - Vented Box Dimensions: 464 x 311 x 330mm ( 18mm thick MDF)(WxHxD) Subwoofer Parameters - Port dimensions (labyrinth) (W x H x L): 29 x 273 x 648mm