Rockford Fosgate Prime R2D2-10, Prime R2D4-10, Prime R2D2-12, Prime R2D4-12 Installation & Operation Manual
R2 -DVC-DUAL VOICE COIL SUBWOOFERS
Dual 2-Ohm R2D2-10 R2D2-12
Dual 4-Ohm R2D4-10 R2D4-12
Serial Number: Date of Purchase:
10" 12"
Installation & Operation
SAFETY
CAUTION: Before installation, disconnect the battery
negative (-) terminal to prevent damage
to the unit, fire and/or possible injury.
PRACTICE SAFE SOUND™
Continuous exposure to sound pressure levels over 100dB may
cause permanent hearing loss. High powered auto sound systems
may produce sound pressure levels well over 130dB. Use common
sense and practice safe sound.
CARTON CONTENTS
• (1) Prime R2 Series Subwoofer
RECOMMENDED ENCLOSURES
This manual outlines two specific types of enclosures that provide
distinctly different performance.This section is to help you decide
which type is best for your application.
SEALED ENCLOSURES
Sealed enclosures are the simplest to build.The most important part of
building a sealed enclosure is to make sure that the enclosure is airtight.
Using glue and some type of sealant on all seams will ensure solid
construction and prevent air leaks.The box volume will directly impact
the performance of the speaker. Larger enclosures will provide flatter
response and deeper bass where smaller boxes will provide a bump in
the response curve and generally higher output for greater SPL.
Advantages of sealed enclosures:
• Small enclosures
• Linear (Flat) response
• No port noise
• High power handling at all frequencies
• Excellent for sound quality
• Extended low frequency output when compared to vented enclosures
VENTED ENCLOSURES
Vented enclosures vary only from the sealed enclosure in that a vent or
port is added to “tune” the enclosure.The enclosures recommended are
designed for great overall performance. Larger boxes tend to be easy to
tune to lower frequencies while medium and small boxes are easier to
tune to higher frequencies.The vented design is less linear in response
than the sealed box but with noticeably more output at the tuning frequency.
Advantages of vented enclosures:
• Higher average output than sealed
• Tuning frequency can be easily adjusted by changing port length
• Deep bass response with lower power requirements
• Great for high output with limited power
Vented vs Sealed
The graph shown here is a sample of how the F3 drop-off point differs
between sealed and vented enclosures.
130.0
120.0
110.0
100.0
90.0
80.0
70.0
60.0
10.0 20.0 40.0 60.0 80.0
Sealed Box
Vented Box
100.0 200.0
Frequency, Hz
BUILDING AN ENCLOSURE
To work properly, the walls of the enclosure must be rigid and not flex
when subjected to the high pressures generated by the speaker's
operation. For optimum performance, we recommend using 3/4" MDF
(Medium Density Fiberboard) and internal bracing.The enclosure should
be glued together and secured with nails or screws.
CALCULATING VOLUME
BoxVolume Height"x Width"x Depth
"
Divided by (cubic feet) 1728
Calculating volume is merely a matter of measuring the dimensions in
inches and using the formula: H x WxDdividedby1728 (cubic feet).
See block below.
If two facing sides are of uneven length, add them together and divide by
two to take the average. Using this number will give you the volume
without the necessity of calculating the box in sections and adding the
sections together.The thickness of the baffle material reduces the internal
volume so this must be subtracted from the outside dimensions to
determine the internal volume.The speaker itself also reduces the
internal volume.The amount of air displaced by each model is listed on
the specification sheet and should also be subtracted from the gross
volume calculation.
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SEALED ENCLOSURES
NOTE: Vb is the gross volume, which is the TOTAL internal volume, before any speaker and/or port displacement.
All external dimensions were based on the use of 3/4" (1.90cm) materials.
NOTE: When using enclosures other than recommended, call Technical Support for correct application.
Optimum Sealed Enclosur e Recommendation
VENTED ENCLOSURES
SEALED ENCLOSURES 10" 12"
R2D2-10 / R2D4-10 R2D2-12 / R2D4-12
Vb- Internal Area cu. ft. 0.59 1.02
(Liter) (16.7) (28.9)
F3- -3dB Point (Hz) 57.5 51.4
Qtc- Enclosure Damping 0.75 0.94
H - Height-inch 15.75 17.5
(cm) (40.01) (44.45)
W - Width-inch 17.5 18.5
(cm) (44.45) (46.99)
D - Depth-inch 6.25 8.25
(cm) (15.88) (20.96)
Recommended Sealed EnclosureV olume Range
SEALED ENCLOSURES 10" 12"
R2D2-10 / R2D4-10 R2D2-12 / R2D4-12
Vb- Volume Range cu. ft. 0.50 to 0.75 0.75 to 1.25
(Liter) (14.16 to 21.24) (21.24 to 35.40)
Specifications subject to change without notice
NOTE: Vb is the gross volume, which is the TOTAL internal volume, before any speaker and/or port displacement.
All external dimensions were based on the use of 3/4" (1.90cm) materials.
NOTE: When using enclosures other than recommended, call Technical Support for correct application.
OptimumVented (Ported) Enclosure Siz es
VENTED ENCLOSURES 10" 12"
Vb- Internal Area cu. ft. 1.40 1.79
(Liter) (39.6) (50.7)
Fb- Tuning Frequency (Hz) 43.0 45.0
F3- -3dB Point (Hz) 37.1 39.4
H - Height-inch 14.0 16.5
(cm) (35.56) (41.91)
W - Width-inch 17.0 20.5
(cm) (43.18) (52.07)
D - Depth-inch 15.25 13.0
(cm) (38.74) (33.02)
P - Port Diameter and
Length-inch (1) 4 x 13 (1) 4 x 9.3
(cm) (1) (10.16 x 33.30) (1) (10.16 x 23.70)
Number of ports noted in ( )
NOTE: The port shown can be placed on any face of the enclosure as long as the port ends are not obstructed.
R2D2-10 / R2D4-10 R2D2-12 / R2D4-12
Specifications subject to change without notice
NOTE: When using vented enclosures, for maximum reliability and power handling ensure that a subsonic or "infrasonic" filter is used so that
only usable low frequency signal is sent to the subwoofer.
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