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

GRSPart # 292-854
Model: 4SMP-4
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The GRS 4SMP-4 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

  • Damped poly cone with rubber surround for controlled resonance
  • Copper cap reduces inductance and distortion
  • Low-profile frame suited to surface mounting for easy installation
  • Vented pole piece and aluminum voice coil former for improved cooling
  • Light-weight 2-layer voice coil improves efficiency and high frequency response
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Overview

GRS 4" Woofer Surface Mount Poly Cone 4 Ohm 4SMP-4

The 4" GRS 4SMP-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 increased airflow across the voice coil 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 4SMP-4 and give your speakers a professional look. The light-weight 2-layer voice coil increases efficiency and improved the high frequency response. Whether you're designing a compact 2-way speaker or restoring a classic system, this woofer offers excellent value and performance.

Product Details

BrandGRS
Model4SMP-4
Part Number292-854
UPC848864079714
Unit of MeasureEach
Weight1.8

Product Specifications

Nominal Diameter4"
Bolt Circle Diameter4.25
Power Handling (RMS)30 Watts
Power Handling (MAX)60 Watts
Impedance4Ω
Frequency Response50 - 6,000Hz
Sensitivity86dB 2.83V/1m
Voice Coil Diameter1"

Thiele-Small Parameters

Resonant Frequency (Fs)58Hz
DC Resistance (Re)3.7Ω
Voice Coil Inductance (Le)0.32mH
Mechanical Q (Qms)3.05
Electromagnetic Q (Qes)0.67
Total Q (Qts)0.55
Compliance Equivalent Volume (Vas)0.14ft³
Mechanical Compliance of Suspension (Cms)0.98mm/N
BL Product (BL)3.9T·m
Diaphragm Mass Inc. Airload (Mms)7.7g
Maximum Linear Excursion (Xmax)4mm
Surface Area of Cone (Sd)54cm²

Materials of Construction

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

Mounting Information

Overall Outside Diameter4.5"
Baffle Cutout Diameter3.75"
Depth2.5"
# Mounting Holes4

Parts Express Staff Recommended Enclosure Volume

Sealed Volume0.1ft³
Sealed F390Hz
Vented Volume0.3ft³
Vented F344Hz

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