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Product Description
Manufacturer Part Number: 4SMP-4
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:
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.
GRS 4SMP-4 Specification Sheet (PDF File) GRS Manufacturer Warranty (PDF File)
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
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 | |
|---|---|
| Brand | GRS |
| Model | 4SMP-4 |
| Part Number | 292-854 |
| UPC | 848864079714 |
| 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 | 4Ω |
| Frequency Response | 50 - 6,000Hz |
| Sensitivity | 86dB 2.83V/1m |
| Voice Coil Diameter | 1" |
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 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 | 0.1ft³ |
| Sealed F3 | 90Hz |
| Vented Volume | 0.3ft³ |
| Vented F3 | 44Hz |
Manuals & Resources
GRS 4SMP-4 Specification Sheet (PDF File) GRS Manufacturer Warranty (PDF File)
Attention CA Residents: Prop 65 Warning
WARNING:
This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.
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