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CLEARANCE 8" Glass Fiber Subwoofer Speaker Pair for Select BMW Models 4 Ohms

GRS
Part #292-494

CLEARANCE 8" Glass Fiber Subwoofer Speaker Pair for Select BMW Models 4 Ohms

GRS
Part #292-494  
Model: B200-4
The GRS B200-4 8" subwoofer pair makes it easy to replace the stock 4 ohm drivers found in many BMW under and behind seat subwoofers. These drop–in replacements fit perfectly in the factory enclosures and will even accept the stock wiring. With a fiberglass cone, rubber surround, and extensively vented neodymium motor you can expect powerful low frequency response and an extremely long life from the B200-4.
Key Features
  • Extremely shallow design for installation into BMW factory enclosures
  • Highly vented neodymium motor keeps power compression to a minimum
  • 2" voice coil allows high power handling for extended listening sessions
  • Fiberglass cone and rubber surround will not deteriorate when exposed to the elements
60 Day No Hassle Return Policy

Overview

8" Glass Fiber Subwoofer Speaker Pair for Select BMW Models 4 Ohms

With a pincushion frame, shallow mounting depth, and front side wiring connection, BMW factory under/behind seat subwoofer drivers are extremely difficult to replace without extensive modifications. Designed to fit perfectly into stock BWM locations, the GRS B200-4 8" low profile subwoofer takes all the work out of replacing these unique drivers making these the perfect drop in upgrades for late model BMW vehicles.

More than just a replacement, the no compromise design of the B200-4 is a significant improvement over the stock 4 ohm BMW driver. With a fiberglass cone and thick rubber surround, this driver will withstand the harsh conditions found in the automotive environment. The 2" voice coil can handle ample power and provides excellent control and linearity. Driving the voice coil is a large front mounted neodymium motor with extensive venting through the pole piece and voice coil gap, which provides sufficient heat dissipation with minimal air turbulence for quiet operation. Holding everything together is a rigid 2-piece steel and polymer frame that has been made specifically to fit the non-standard BMW openings.

Note: Sold in pairs.

Product Details

BrandGRS
ModelB200-4
Part Number292-494
UPC848864051406
Unit of MeasurePairs
Weight7.45

Product Specifications

Nominal Diameter8"
Bolt Circle Diameter9
Power Handling (RMS)100 Watts
Power Handling (MAX)200 Watts
Impedance4Ω
Frequency Response25 to 2,000Hz
Sensitivity91.6dB 2.83V/1m
Voice Coil Diameter2"

Thiele-Small Parameters

Resonant Frequency (Fs)58Hz
DC Resistance (Re)3.2Ω
Voice Coil Inductance (Le)0.68mH
Mechanical Q (Qms)3.97
Electromagnetic Q (Qes)0.78
Total Q (Qts)0.65
Compliance Equivalent Volume (Vas)0.53ft³
Mechanical Compliance of Suspension (Cms)0.18mm/N
BL Product (BL)7.73T·m
Maximum Linear Excursion (Xmax)5.5mm
Surface Area of Cone (Sd)240cm²

Materials of Construction

Cone MaterialFiberglass
Surround MaterialRubber
Voice Coil Wire MaterialCopper
Voice Coil FormerKapton® / Polyimide
Basket / Frame MaterialPolymer
Magnet MaterialNeodymium

Mounting Information

Overall Outside Diameter8.5"
Baffle Cutout Diameter7.625"
Depth2.25"
# Mounting Holes4

Parts Express Staff Recommended Enclosure Volume

Sealed Volume0.69ft³
Sealed F376Hz
Vented Volume1.4ft³
Vented F338Hz

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