Alpine SBR-S8D4.2 R-Series 8” Compact Subwoofer

Award winning SBR-S8D4, named INCAR SUBWOOFER OF THE YEAR – LOADED ENCLOSURE for 2017.

The SBR-S8D4 features Alpine’s Type-R 8″ subwoofer in a custom slot ported enclosure. Ideal for installation in small spaces, its compact size means it can fit virtually anywhere.

The pre-installed subwoofer employs many features typically found in larger models, such as Alpine’s H.A.M.R (High Amplitude Multi Roll) suspension. This unique design allows greater linear excursion while improving control, to achieve maximum output and outstanding sound quality.

Designed to achieve optimal output, the carpeted enclosure features heavy duty MDF construction. Plus, stylish brushed aluminium laminate and a robust grill create the perfect balance of stunning aesthetics and practicality.

Features

900W Peak Power
300W RMS Power
High Amplitude Multi Roll (HAMR) surround
Frequency Response: 28Hz – 400Hz
USA Designed Slot Ported Subwoofer Enclosure
Heavy Gauge Spring Terminals
Dimensions: (L x W x H cm) 49 x 29 x 16
SWR-823D Pre-installed
Grille Included

Specifications

Subwoofer Size: 8″
Power Handling (RMS/Peak): 350W/1000W
Power Range (RMS): 150W-350W
Frequency Response (Hz): 28Hz-200Hz
Diaphragm Material: Kevlar-Reinforced Pulp Fiber
Diaphragm Design: 2-piece structural parabolic
Surround Material: Injection molded santoprene
Surround Design: High Amplitude Multi-Roll (Patent Pending)
Spider Material: Nomex
Spider Design: Progressive
Voice Coil Material: 180˚C High Temp Wire on Spiral Cut Aluminium Former
Voice Coil Design: 4-Layer Dual Voice Coil
Motor Structure Pole Geometry: Compound Radius Curve
Motor Structure Configuration: Integration Shorting Sleeve with Radial Vented VC Head Transfer
Magnet Material: High-Power Strontium Ferrite
Magnet Configuration: 6-Piece (8″) / 10-Piece (10″/12″) Radially Segmented, Double Stacked
Frame Material: Cast Aluminium
Frame Design: Single-Piece Casting with Airflow Management System
Terminals Layout: One sided
Terminals Design: Heavy Duty 8ga, Push with housing, Banana Sockets for VC Configuration Jumpers
Tinsel Leads Design: Reinforced Layer Spider Integration
Gasket Design: Concealed Mount Gasket System and Integrated Grill Ready

ELECTRO-MECHANICAL PARAMETERS

Nominal Impedance: 2ohms+2ohms
Frequency Response: 28-200Hz
Sensitivity (SPL @ 1W/1m): 83.5dB
D.C Coil Resistance (Re): 1.85ohms +1.85ohms
Inductance (Le) 1kHz/20kHz: 0.87mH/0.30mH
Free Air Resonance (Fs): 38Hz
Equivalent Stiffness (Vas): 12L (0.42 ft³)
Mechanical Q (Qms): 7.8
Electrical Q (Qes): 0.55
Total Q (Qts): 0.50
Xmax10 (One-Way Xmax @ 10% Distortion): 14mm
Mechanical Excursion, Peak-to-Peak: 52mm
Gap Height (Hag): 10mm
Coil Height (Hvc): 29mm
Cone Area (Sd): 201 cm²
Voice Coil Diameter: 40mm (1.6″)
Magnet Weight: 52oz