Prime 8" Dual 4-Ohm Subwoofer RM18D4

RM18D2_2
RM18D2_1
RM18D2_2
RM18D2_1
RM18D2_2
RM18D2_1

Prime 8" Dual 4-Ohm Subwoofer RM18D4

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.

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Discontinued

2Ω DVC White

2Ω DVC Black

4Ω DVC White

4Ω DVC Black
Overview Technologies Specifications Support Accessories Wiring Wizard Box Advisor
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.

FEATURES AT A GLANCE

  • True Marine Grade compliance
  • 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
  • Injection molded mineral filled polypropylene cone body with UV inhibitors
  • Removable trim ring/grille
  • Moisture, tear and fatigue resistant Aramid fiber spider
  • Available in black or white
  • 2-Year Warranty
Technologies
Anodized Aluminum Voice Coil Former

Rockford Fosgate subwoofers use anodized aluminum voice coil formers for superior heat dissipation (up to 100° ...

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CEA-2031

Power handling on Rockford Fosgate speakers conform to CEA-2031 industry standards.

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ASTM Test Standards

Marine Grade standards ensure resistance to extreme environments.

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Element Ready™ | Subwoofers

All components are protected against harsh outdoor elements like Dust, UV, Temperature, Water, Corrosion & Vibration.

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FlexFit 2 Basket - Marine Sub

The slot mounted frame pattern allows for variable adjustments to the mounting position of the subwoofer.

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VAST Surround - Marine

The Vertical Attach Surround Technique significantly increases a subwoofer's effective radiating cone area up to 25%.

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Klippel Verified

Klippel is a speaker certification program allowing us to deliver the best possible subwoofers.

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Specifications
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
Shipping Weight
CEA-2031 Compliant
CEA-2031 Guidelines
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
Compatibility
Support

Knowledge Base Articles


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Ask Our Experts

Return Authorization

Contact the Authorized Rockford Fosgate Dealer you purchased this product from. If you need further assistance, call 1-800-669-9899 for Rockford Customer Service. You must obtain an RA# (Return Authorization number) to return any product to Rockford Fosgate. You are responsible for shipment of product to Rockford.


Return Authorization Process



Diagnose First

Prior to requesting an RA, try to diagnose the failure. Many products we receive are sent back with No Trouble Found, usually due to incorrect installation. Use our RFTECH:Knowledge Base for troubleshooting assistance.



Contact Customer Support

Please call us during normal business hours at 1-800-669-9899 (option #1) and be prepared with the following information:

  • First and Last Name with complete Shipping Address
  • Product Name (T0D415)
  • Serial Number (12 or 13 digit number)
  • Failure Diagnosis (no output, no power LED, etc.)
  • Scanned copy of Original Receipt emailed to [email protected] (dealer name, purchase date, and item purchased must be legible)
  • Credit/Debit Card (if paying for out-of-warranty claims)
  • No money orders or checks.


Shipping Instructions

When shipping your product, your package MUST have the following information:

  • RA# Printed Outside of Box (as large as possible)
  • Copy of Original Receipt


Shipping Address

Ship your product (UPS or FedEx preferred) to the following:


Rockford/ AJR International
300 Regency DR
Glendale Heights, IL 60139
RA#:_______________________
Accessories
Three Quarter Beauty Shot of Frosted Black and Silver 12 AWG Speaker Wire

12 AWG Speaker Wire Packaged 15 Foot Frosted Black/Silver

RFWP12-15
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Wiring Wizard

Available Wiring Diagrams

Please consult your amplifier owner's manual for lowest recommended impedance.



Wiring Diagram #1



Wiring Diagram #2



Wiring Diagram #3



Wiring Diagram #4



Wiring Diagram #5



Wiring Diagram #6



Wiring Diagram #7



Wiring Diagram #8



Wiring Diagram #9

Speaker Polarity

Your woofer may use one of the following to identify (+/-) terminals.

Positive +

Red Post

Purple (4Ω)

Red (8Ω)

Negative -

Black Post

No Dot

No Dot

FAQ

Determining power needed for speakers

Prevent blowing your subwoofers

Temperature differences between subwoofer voice coil types

Differences between SVC and DVC subwoofers

Speaker Polarity

Your woofer may use one of the following to identify (+/-) terminals.

Positive +

Red Post

Purple (4Ω)

Red (8Ω)

Negative -

Black Post

No Dot

No Dot

FAQ

Determining power needed for speakers

Prevent blowing your subwoofers

Temperature differences between subwoofer voice coil types

Differences between SVC and DVC subwoofers

Box Advisor
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