Specifications:
250mm Polypropylene Cone (PP Cone)
400 Rated/RMS Input Power
High-ridged Two-piece Diaphragm for solid bass
X-motif cap Technology for resonance control
Single, multi-layered, voice coil.
Aluminum bobbin for better thermal conductivity
Airflow control for optimal heat radition
Stress controlled spider
Push-terminals for easy connection
Sealed/Ported installation capabillity
Speaker Features
Speaker Size    250mm
Oversized Dimension
Speaker Cone Design Diamond-Array pattern
Magnet Type Ferrit
Voice-coilsingle, multi-layer voice coil
Terminals Push Type
Spider  Stress controlled spider
Bottom-Yoke   Fully closed bottom yoke
Heat dissipation technology   Airflow control
Installation Capabillity Sealed / Ported
Speaker/woofer Specifications
Peak Input Power 1300W
Rated Input Power 400W
Woofer Cone material Polypropylene (PP) Cone
Center Cap Type x-motif cap
Speaker Basket Steel
Speaker Surround Foam
Spider Type Stress controlled Spider
Sensitivity 85dB/W/m
Frequency Response  33Hz ~ 300Hz
Speaker Impedance    4Ω
Dimensions (W x H x D) 275 x 275 x 142.2mm
Mounting Depth 124mm
Mouting Hole Diameter Ø 230mm
Speaker Weight 4000gr
Subwoofer Parameters
Nominal impedance (Z) 4Ω
DC resistance (Re) 3.7Ω
Resonant frequency (FSO) 33.7Hz
Mechanical Q factor (QMS) 6.95
Electrical Q factor (QES) 0.554
Total Q factor (QTS) 0.513
Voice coil inductance (LBM) 1.9mH
Voice coil diameter (d) 50mm
Force factor (BL) 13.2T/m
Peak excursion Xmax  5.9mm
Moving mass (MMS)   124gr.
Volume accoustic compliance (VAS)  31.9liter
Piston Area (SD) 0.0512m²
Displacement  0.9cc
Sealed box volume 18.4liter
Sealed Box Dimensions 375 x 324 x 229mm ( 18mm thick MDF)(WxHxD)
Vented box volume 25.5liter
Vented Box Dimensions 464 x 311 x 330mm ( 18mm thick MDF)(WxHxD)
Port dimensions (labyrinth) (W x H x L) 29 x 273 x 648mm