Rockford Fosgate R2 DVC DUALVOICE COIL SUBWOOFERS User Manual
- June 5, 2024
- Rockford Fosgate
Table of Contents
Rockford Fosgate R2 DVC DUALVOICE COIL SUBWOOFERS
Installation & Operation
SAFETY
CAUTION: Before installation, disconnect the battery negative (-) terminal to prevent damage to the unit, fire and/or possible injury.
CARTON CONTENTS
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 fre-quency.
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. 
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
Calculating volume is merely a matter of measuring the dimensions in inches
and using the formula: H x W x D divided by 1728 (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.
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 Enclosure Recommendation
SEALED ENCLOSURES| 10″
R2D2-10 / R2D4-10
| 12″
R2D2-12 / R2D4-12
---|---|---
Vb- Internal Area cu. ft. (Liter)| 0.59
(16.7)
| 1.02
(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 Enclosure Volume Range
SEALED ENCLOSURES| 10″
R2D2-10 / R2D4-10
| 12″
R2D2-12 / R2D4-12
---|---|---
Vb- Volume Range cu. ft. (Liter)| 0.50 to 0.75 (14.16 to
21.24)| 0.75 to 1.25 (21.24 to 35.40)
VENTED 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 Vented (Ported) Enclosure Sizes
VENTED ENCLOSURES| 10″
R2D2-10 / R2D4-10
| 12″
R2D2-12 / R2D4-12
---|---|---
Vb- Internal Area cu. ft. (Liter)| 1.40
(39.6)
| 1.79
(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)
NOTE: The port shown can be placed on any face of the enclosure as long
as the port ends are not obstructed.
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.
PHYSICAL DIMENSIONS
PRIME R2-DVC| 10″
R2D2-10 / R2D4-10
| 12″
R2D2-12 / R2D4-12
---|---|---
A – Overall Diameter-inch| 10.84| 12.97
(mm)| (275)| (329)
B – Screw Hole Diameter-inch| 10.16| 12.28
(mm)| (258)| (312)
C – Mounting Depth-inch| 4.33| 5.10
(mm)| (110)| (129)
D – Mounting Diameter-inch| 9.13| 11.22
(mm)| (232)| (285)
E – Speaker Displacement – cu. ft.| 0.101| 0.150
(Liter)| (2.85)| (4.25)
SPECIFICATIONS
PRIME R2-DVC| 10″
R2D2-10 / R2D4-10
| 12″
R2D2-12 / R2D4-12
---|---|---
Nominal Impedance (ohms)| 2 x 2 / 2 x 4| 2 x 2 / 2 x 4
Frequency Response (Hz)| 45-250| 43-250
Voice Coil Diameter – inch (mm)| 2 (4-Layer)
(51)
| 2 (4-Layer)
(51)
Displacement – cu. ft. (Liter)| 0.101
(2.85)
| 0.150
(4.25)
Fs – Free Air Resonance (Hz)| 35| 35
Qts| 0.47 / 0.53| 0.60
Vas – cu. ft. (Liter)| 1.38
(39.0)
| 2.34 / 2.43
(66.4 / 68.8)
Xmax – inch (mm)| 0.256 / 0.236
(6.5 / 6.0)
| 0.256 / 0.236
(6.5 / 6.0)
SPL (dB @ 1w/1m)| 89| 87
Power Handling-Watts (RMS) (Peak)| 250
500
| 250
500
WIRING CONFIGURATIONS
By varying the wiring configuration of your speakers you can create an impedance load to match your system. Altering the wiring configurations gives a range of options for impedance loads. Series, Parallel, or Series-Parallel wiring configurations are different techniques for wiring speakers that provide different loads. Series configuration is a string method where speakers are wired end to end. The parallel configuration uses two or more speakers wired across common terminals. Series-Parallel configuration combines both techniques. Choose the wiring diagram that corresponds to the number of woofers and the impedance of your amplifier.
SUBWOOFER CROSSOVERS
There are two operational types of crossovers, passive and active. Passive
crossovers (coils or inductors) are placed on the speaker leads between the
amplifier and speaker.An active crossover is an electronic filter that
separates the audio signal fed to different amplifiers. For optimum subwoofer
performance, we recommend using an active 80-100Hz low-pass crossover at
12dB/octave. 
References
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