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NEW GRS 5-1/4" Woofer Surface Mount Poly Cone 4 Ohm 5SMP-4

GRSPart # 292-858
Model: 5SMP-4
The GRS 5SMP-4 5-1/4" woofer is a compact, surface-mount driver built for versatility and high performance in both new and replacement audio systems. Featuring a damped poly cone and rubber surround for smooth, controlled response, it also incorporates advanced motor enhancements like a copper cap and vented pole piece to reduce distortion and power compression. Designed for sealed or vented enclosures, this woofer is an ideal fit for smaller 2-way designs, offering dependable output and long-lasting durability.

Key Features

  • Copper cap reduces inductance and distortion
  • Damped poly cone with rubber surround for controlled resonance
  • Vented pole piece and aluminum voice coil former for improved cooling
  • Low-profile frame suited to surface mounting for easy installation
  • 4-layer voice coil boosts output and power handling
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Overview

GRS 5-1/4" Woofer Surface Mount Poly Cone 4 Ohm 5SMP-4

The 5-1/4" GRS 5SMP-4 is designed to deliver consistent performance making it a perfect fit for compact speaker builds or retrofitting aging systems. Its damped poly cone ensures a natural tonal character, while the rubber surround maintains control over cone excursion for smooth, extended low-frequency response. The woofer’s construction prioritizes longevity and acoustic accuracy, making it a practical choice for both DIY speaker projects and commercial applications.

A key highlight of this woofer is its advanced motor system. A copper cap reduces inductance, helping to smooth high-frequency roll-off and reduce harmonic distortion, while a vented pole piece allows better airflow through the motor to keep temperatures down. Combined with an aluminum voice coil former, these features work together to minimize power compression, ensuring consistent performance even at higher output levels.

Engineered with installation flexibility in mind, the low-profile surface-mount frame makes it easy to install the 5SMP-4 and give your speakers a professional look. The 4-layer voice coil increases the driver’s BL product and power handling, offering greater efficiency and output. Whether you're designing a compact 2-way speaker or restoring a classic system, this woofer offers excellent value and performance.

Product Details

BrandGRS
Model5SMP-4
Part Number292-858
UPC848864079806
Unit of MeasureEach
Weight3

Product Specifications

Nominal Diameter5-1/4"
Bolt Circle Diameter5.3
Power Handling (RMS)35 Watts
Power Handling (MAX)70 Watts
Impedance4Ω
Frequency Response50 - 2,500Hz
Sensitivity88.8dB 2.83V/1m
Voice Coil Diameter1"

Thiele-Small Parameters

Resonant Frequency (Fs)62Hz
DC Resistance (Re)3.7Ω
Voice Coil Inductance (Le)0.58mH
Mechanical Q (Qms)4.21
Electromagnetic Q (Qes)0.62
Total Q (Qts)0.54
Compliance Equivalent Volume (Vas)0.212ft³
Mechanical Compliance of Suspension (Cms)0.63mm/N
BL Product (BL)4.9T·m
Diaphragm Mass Inc. Airload (Mms)10.4g
Maximum Linear Excursion (Xmax)2mm
Surface Area of Cone (Sd)8cm²

Materials of Construction

Cone MaterialPoly
Surround MaterialRubber
Voice Coil FormerAluminum
Basket / Frame MaterialSteel
Magnet MaterialFerrite

Mounting Information

Overall Outside Diameter5.7"
Baffle Cutout Diameter4.5"
Depth2.5"
# Mounting Holes4

Parts Express Staff Recommended Enclosure Volume

Sealed Volume0.15ft³
Sealed F398Hz
Vented Volume0.4ft³
Vented F348Hz

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