Alpine VR Series SWS-3087 subwoofer Specification

FEATURES

General

Large Strontium Ferrite Magnet

Kapton Voice Coil Bobbin

2" Diameter Voice Coil

OFC Voice Coil

Inverted Dust Cap

Ceramic-Coated Non-Pressed Pulp Cone

Flat Spider Suspension

Extended and Vented Pole

Bumped Backplate

Soft Clip Design

Rubber Surround

Gold Plated Push Lock Terminals

Front Loading

Opening

Cut-Out

10-31/32"

(278mm)

11-21/32"

(296mm)

1 2

SWS-3087

12" VR Series Subwoofer (8 ohm)

5-1/16"

(128mm)

1/2"

(12.5 mm)

3/16" x 8 Holes

(4.5 mm)

12-7/32"

(301 mm)

5-3/4"

(145mm)

11"

(278mm)

SPECIFICATIONS

Power Handling

Power Handling Capacity(RMS) ................................................................ 100W RMS

Power Handling Capacity(Peak) ................................................................ 300W RMS

Recommended Amplifier Output ......................................................... Up to 100W RMS

Thiel Small Parameters

Impedance(Nominal) ...................................................................................... 8 ohms

DC Resistance ............................................................................................ 6.8 ohms

Free Air Resononce(Fs) ...................................................................................... 30Hz

Equivalent Suspension Stiffness(Vas) ............................................... 118.9liters(4.20cu.ft.)

Mechanical Q ................................................................................................. 5.95

Electrical Q ..................................................................................................... 0.34

Total Loudspeaker Q(Qts) ................................................................................... 0.32

Linear Excursion(X linear) .................................................................................. 3.6mm

Maximum Excursion(X peak) .............................................................................. 7.2mm

General

Diaphragm Material ................................................... Ceramic Coated Nonpressed Pulp

Diaphragm Shape ................................................................................ Inverted Dome

Cone Area .............................................................................. 499sq.cm.(77.3sq.in.)

Surround Material ........................................................................................... Rubber

Magnet Material ................................................................................ Strontium Ferrite

Magnet Weight ..................................................................................... 1.2kg(40oz.)

Voice Coil Diameter ................................................................................. 49mm(2 in.)

Mounting Depth(top mount) ....................................................................... 127mm(5in.)

Mounting Depth(bottom mount) ........................................................ 139.5mm(5-1/2in.)

Cutout Diameter ......................................................................... 278mm(10-15/16in.)

Driver Physical Volume(top mount) ........................................................ 2.3liters(.08cu.ft.)

Driver Physical Volume(bottom mount) ................................................... 3.1liters(.11cu.ft.)

Driver Weight ................................................................................... 4.1kg(9lb. 1oz.)

Specifications and design are subject to change without notice

SWS-3087

12" VR Series Subwoofer (8 ohm)

Vehicle

Size

Compact

6' to 7.5'

87 Hz

10' to 12'

48 Hz

Vb1

Mid Size

7.5' to 10'

66 Hz

Large

Sealed

Sound

Type

Low & Tight

Balanced

Loud & Boomy

Low & Tight

Balanced

Loud & Boomy

Low & Tight

Balanced

Loud & Boomy

Vb1

Fb1

Vented

Box

Type

Sealed

Vented

Bandpass

Sealed

Vented

Bandpass

Sealed

Vented

Bandpass

Sealed

Vented

Bandpass

Sealed

Vented

Bandpass

Sealed

Vented

Bandpass

Sealed

Vented

Bandpass

Sealed

Vented

Bandpass

Sealed

Vented

Bandpass

0.96

-

0.88

2.24

1.76

1.43

2.24

-

1.43

1.20

-

1.20

(cu ft)

2.24

-

1.43

1.33

Ñ

1.23

0.62

-

0.88

1.76

1.43

1.02

0.88

1.02

0.88

Vb1(Unfilled) Vb1(Filled) F(B1)

-

3 5

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

Ñ

(Hz)

-

-

-

-

3 5

-

-

4 0

-

0.77

-

0.70

1.79

1.41

1.14

1.79

-

1.14

0.96

-

0.96

(cu ft)

1.79

-

1.14

1.06

Ñ

0.98

0.50

-

0.70

1.41

1.14

0.82

0.70

0.82

0.70

Q(tc) V(B2) F(B2)

0.77

-

0.8

0.55

0.6

0.65

-

0.8

0.55

-

0.65

0.7

-

0.7

-

0.55

-

0.65

0.67

Ñ

0.7

0.95

0.6

0.65

0.75

0.8

0.75

0.8

-

-

0.6

-

-

0.7

-

0.75

-

-

0.65

-

-

0.65

(cu ft)

-

-

1

-

-

0.87

-

-

-

0.78

-

-

0.7

-

-

9 5

-

-

7 5

9 0

-

-

9 0

-

1 0 0

-

-

-

-

9 5

-

(Hz)

-

-

9 0

-

-

7 8

-

-

8 2

Vb1 Vb2

Bandpass

Fb2

Vent Description

Ñ

Not Recommended two 3" ports, each 1.625" long

Ñ

Not recommended two 3" ports, each 1.75" long

Ñ

Not Recommended two 3" ports, each 2.0" long

Ñ

Not Recommended two 3" ports, each 4.25" long

Ñ

Not Recommended two 3" ports, each 4.25" long

Ñ

Not Recommended two 3" ports, each 4.0" long

Ñ two 2" ports, each 6.25" long one 3" port, 2.75" long

Ñ two 2" ports, each 8.25" long two 3" ports, each 5.0" long

Ñ two 2" ports, each 9.25" long two 3" ports, each 5.0" long

Notes:

Vehicle Size = Longest measurement in the vehicle

Sound Type

Low ~ Typically a real "tight" sound, Qtc near 0.505 very accurate bass

Neutral ~ Good balance between "boom" and "tight". Qtc near 0.707

Loud ~ "Boom" type system. Loud but not low (Hz). Qtc near 0.9

Qtc = The total "Q" of the closed box system. The lower the Q, the smoother the bass

Vb1 (Unfilled) = "Build-to" volume. accounts for speaker and port displacement

Vb1 (Filled) = "Build-to" volume. 20% box volume reduction when using filling

F(b1) = Tuning frequency of Vb1 (Vented Enclosures)

F(b2) = Tuning frequency of Vb2 (Bandpass enclosures)

Recommended Crossover Points.

Sealed enclosures as low as possible ~ 65 Hz or below

Vented enclosures ~ 80 Hz or below

Bandpass enclosures ~ 100 Hz or below

Enclosure Filling: In sealed boxes it is recommended to fill with acoustic fiberglass or Dacron batting in order to minimize sound reflections inside the box. Filling an enclosure can allow for approximately a 20% smaller box due to its thermodynamic capabilities. The calculated box volumes above, Vb1 (filled), have taken this reduction into consideration. Vented Enclosures: It is recommended that the interior walls of a vented enclosure be lined with 1/2" to 1" fiberglass sheeting or polyester batting. This will greatly reduce sound reflections in the enclosure. Loose filling in a vented enclosure is not recommended as it can impede air flow through the vent.

Vehicle Size: Since installing a speaker into a vehicle is like putting a box inside of another box, the calculations above take into consideration the vehicles sound properties. Just as a woofer/box combination must be matched for the best sound, so must the woofer/box and vehicle. To find out the proper size of the vehicle to use in the chart above, simply measure the longest length in the vehicle. This is typically from the left corner of the front windshield to the right corner of the rear window. Using this method will help produce consistent predictable results, with the desired bass performance.

Box Construction: Use 3/4" to 1" wood, preferably MDF (Medium Density Fiberboard), or Marine-Grade Plywood. Glue and nail, or screw the enclosure together. Seal all potential air leaks. A box with air leaks creates allot of noise and can cause speaker damage. Round the edges of the ports to reduce port noise (whistling), and keep the openings of the ports free from obstructions.

Specifications and design are subject to change without notice