NEW GRS 4" Woofer Surface Mount Poly Cone 8 Ohm 4SMP-8

Name: GRS 4" Woofer Surface Mount Poly Cone 8 Ohm 4SMP-8
Brand: GRS
SKU: 292-856
Price: 14.49 USD
Availability: InStock

GRSPart # 292-856

Model: 4SMP-8

4 inch - 4 ohm 4 inch - 8 ohm 5-1/4 in - 4 ohm 5-1/4 inch - 8 ohm 6-1/2 inch - 4 ohm 6-1/2 inch - 8 ohm 8 inch - 8 ohm 8 inch - 4 ohm 10 inch - 4 ohm 10 inch - 8 ohm 12 inch - 4 ohm 12 inch - 8 ohm

The GRS 4SMP-8 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

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

Overview

GRS 4" Woofer Surface Mount Poly Cone 8 Ohm 4SMP-8

The 4" GRS 4SMP-8 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-8 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
Brand	GRS
Model	4SMP-8
Part Number	292-856
UPC	848864079745
Unit of Measure	Each
Weight	1.8

Product Specifications
Nominal Diameter	4"
Bolt Circle Diameter	4.25
Power Handling (RMS)	30 Watts
Power Handling (MAX)	60 Watts
Impedance	8Ω
Frequency Response	50 - 6,000Hz
Sensitivity	84.4dB 2.83V/1m
Voice Coil Diameter	1"

Thiele-Small Parameters
Resonant Frequency (Fs)	63Hz
DC Resistance (Re)	5.5Ω
Voice Coil Inductance (Le)	0.58mH
Mechanical Q (Qms)	3
Electromagnetic Q (Qes)	0.83
Total Q (Qts)	0.65
Compliance Equivalent Volume (Vas)	0.141ft³
Mechanical Compliance of Suspension (Cms)	0.97mm/N
BL Product (BL)	4.2T·m
Diaphragm Mass Inc. Airload (Mms)	6.6g
Maximum Linear Excursion (Xmax)	4mm
Surface Area of Cone (Sd)	54cm²

Materials of Construction
Cone Material	Poly
Surround Material	Rubber
Voice Coil Former	Aluminum
Basket / Frame Material	Steel
Magnet Material	Ferrite

Mounting Information
Overall Outside Diameter	4.5"
Baffle Cutout Diameter	3.75"
Depth	2.5"
# Mounting Holes	4

Parts Express Staff Recommended Enclosure Volume
Sealed Volume	0.2ft³
Sealed F3	82Hz
Vented Volume	0.4ft³
Vented F3	41Hz

Specifications

Q&A

Reviews

Manuals & Resources

GRS 4SMP-8 Specification Sheet (PDF File) GRS 4SMP-8 Graphs/FRD/ZMA Data File (ZIP File) GRS Manufacturer Warranty (PDF File)

California Prop 65

WARNING: Cancer and Reproductive Harm

NEW GRS 4" Woofer Surface Mount Poly Cone 8 Ohm 4SMP-8

Key Features

Overview

Product Details

Product Specifications

Thiele-Small Parameters

Materials of Construction

Mounting Information

Parts Express Staff Recommended Enclosure Volume

Specifications

Q&A

Reviews

Manuals & Resources

Manuals & Resources