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Rockford Fosgate RM18D4Prime 8" Dual 4-Ohm Subwoofer
Variants
The RM18D4 is a white 8” Prime R1 subwoofer designed for marine watercraft or powersports applications. It features color matched grille and is UV and moisture resistant. Can be used in sealed, vented or infinite baffle installations.
Highlights
- 2-Year Warranty
- Proprietary corrosion resistant spring loaded push terminals
- UV and Salt-Fog Resistant Santoprene surround
- 100% UV stable ASA injection molded plastic parts
Key specs
Full specs- Nominal Impedance
- Dual 4-Ohm
- Speaker Connector
- Dual 12 AWG compression
- Mounting Depth
- 3.6 in. (91.7 mm)
- Magnet Weight (oz)
- 17.72 oz. (0.50 Kg)
- Voice Coil Diameter
- 1.5" aluminum
- Re (Ohms)
- 6.3
- Fs (Hz)
- 41.5
- Qes
- 0.89
Key specs
Full specs- Nominal Impedance
- Dual 4-Ohm
- Speaker Connector
- Dual 12 AWG compression
- Mounting Depth
- 3.6 in. (91.7 mm)
- Magnet Weight (oz)
- 17.72 oz. (0.50 Kg)
Highlights
Overview- 2-Year Warranty
- Proprietary corrosion resistant spring loaded push terminals
- UV and Salt-Fog Resistant Santoprene surround
Overview
The RM18D4 is a white 8” Prime R1 subwoofer designed for marine watercraft or powersports applications. It features color matched grille and is UV and moisture resistant. Can be used in sealed, vented or infinite baffle installations.
Highlights
Key features
- 2-Year Warranty
- Proprietary corrosion resistant spring loaded push terminals
- UV and Salt-Fog Resistant Santoprene surround
- 100% UV stable ASA injection molded plastic parts
- Ultra-flexible fully insulated silicone lead wire
- Moisture, tear and fatigue resistant Aramid fiber spider
- Removable trim ring/grille
- True Marine Grade compliance
- Injection molded mineral filled polypropylene cone body with UV inhibitors
- Available in black or white
- Anodized Aluminum Voice Coil Former
- CEA-2031
Technologies
Anodized Aluminum Voice Coil Former
Unlike traditional plastic substitutions, aluminum acts like a heat-sink to quickly dissipate thermal build-up on
CEA-2031
Power handling on Rockford Fosgate speakers conform to CEA-2031 industry standards. This means your speaker has
ASTM Test Standards
ASTM B117 salt/fog test standard provides accelerated aging in a controlled corrosive environment to produce
Element Ready™ | Subwoofers
All components are protected against harsh outdoor elements like Dust, UV, Temperature, Water, Corrosion &
FlexFit 2 Basket - Marine Sub
The slot mounted frame pattern of the FlexFit 2 basket utilizes oval openings (where feasible) instead of single
Patent: Patent Pending
VAST Surround - Marine
Rockford Fosgate's proprietary surround technique, VAST, provides up to a 25% increase in the speakers effective
Klippel Verified
To adorn the ‘Verified with Klippel’ mark, the qualifying company’s loudspeaker engineering personnel must be
Specs
Specifications
19
| Nominal Impedance | Dual 4-Ohm |
| Speaker Connector | Dual 12 AWG compression |
| Mounting Depth | 3.6 in. (91.7 mm) |
| Magnet Weight (oz) | 17.72 oz. (0.50 Kg) |
| Voice Coil Diameter | 1.5" aluminum |
| Re (Ohms) | 6.3 |
| Fs (Hz) | 41.5 |
| Qes | 0.89 |
| Qms | 8.48 |
| Vas (Liters) | 19.0 |
| Xmax (mm) | 7.0 |
| SPL (dB @ 1w/1m) | 85 |
| Qts | 0.81 |
| Cutout Diameter | 7.0 in. (177 mm) |
| Woofer Displacement | 0.05 cu. ft. (1.41 Liters) |
| Size | 8" |
| Power Handling (Watts RMS) | 150 Watts RMS 300 Watts Max |
| Le (mH) | 2.48 |
| Sd (cm2) | 277 |
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Installation resources
Wiring diagrams
9
Wiring Diagram #1
Source: Rockford Fosgate
Wiring Diagram #2
Source: Rockford Fosgate
Wiring Diagram #3
Source: Rockford Fosgate
Wiring Diagram #4
Source: Rockford Fosgate
Wiring Diagram #5
Source: Rockford Fosgate
Wiring Diagram #6
Source: Rockford Fosgate
Wiring Diagram #7
Source: Rockford Fosgate
Wiring Diagram #8
Source: Rockford Fosgate
Wiring Diagram #9
Source: Rockford Fosgate
Support
Return Authorization
If you bought this product from Onkar Electronics, use the Contact Us page on the Onkar Electronics website and we will help with return authorization and warranty support. If you purchased it from another dealer, contact that authorized dealer first for return assistance.
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