Alpine SWL-3088 Car Speaker
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FEATURES
General
Large Strontium Ferrite Magnet
Kapton Voice Coil Bobbin
2" Diameter Voice Coil
OFC Voice Coil
Extended 1 in. Voice Coil for Long Excursion
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
SWL-3088
12" XR Series Subwoofer (8 ohm)
5-3/4"
(145mm)
1/2"
(12.5 mm)
3/16" x 8 Holes
(4.5 mm)
12-7/32"
(301 mm)
6-9/16"
(156 mm)
11"
(278mm)
SPECIFICATIONS
Power Handling
Power Handling Capacity(RMS) ................................................................ 200W RMS
Power Handling Capacity(Peak) ................................................................ 600W RMS
Recommended Amplifier Output ......................................................... Up to 200W RMS
Thiel Small Parameters
Impedance(Nominal) ...................................................................................... 8 ohms
DC Resistance ............................................................................................ 6.8 ohms
Free Air Resononce(Fs) ...................................................................................... 26Hz
Equivalent Suspension Stiffness(Vas) ............................................... 113.9liters(4.02cu.ft.)
Mechanical Q ................................................................................................. 6.54
Electrical Q ..................................................................................................... 0.35
Total Loudspeaker Q(Qts) ................................................................................... 0.33
Linear Excursion(X linear) ................................................................................ 10.0mm
Maximum Excursion(X peak) ............................................................................ 20.0mm
General
Diaphragm Material ................................................... Ceramic Coated Nonpressed Pulp
Diaphragm Shape ................................................................................ Inverted Dome
Cone Area .............................................................................. 491sq.cm.(76.1sq.in.)
Surround Material ........................................................................................... Rubber
Magnet Material ................................................................................ Strontium Ferrite
Magnet Weight ................................................................................... 1.45kg(50oz.)
Voice Coil Diameter ................................................................................. 49mm(2 in.)
Mounting Depth(top mount) ................................................................ 145mm(5-3/4in.)
Mounting Depth(bottom mount) ........................................................ 157.5mm(6-1/4in.)
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 ................................................................................. 4.4kg(9lb. 11oz.)
Specifications and design are subject to change without notice
SWL-3088
12" XR Series Subwoofer (8 ohm)
Vehicle
Size
Compact
6' to 7.5'
87 Hz
Mid Size
7.5' to 10'
66 Hz
Large
10' to 12'
48 Hz
Sound
Type
Low & Tight
Balanced
Loud &Boomy
Low & Tight
Balanced
Loud &Boomy
Low & Tight
Balanced
Loud &Boomy
Box
Type
Sealed
Vented
Bandpass
Closed
Vented
Bandpass
Sealed
Vented
Bandpass
Sealed
Vented
Bandpass
Closed
Vented
Bandpass
Sealed
Vented
Bandpass
Sealed
Vented
Bandpass
Sealed
Vented
Bandpass
Sealed
Vented
Bandpass
Vb1(Unfilled)
0.71
0.79
0.91
1.08
1.42
1.60
0.91
1.19
1.23
(cu ft)
1.23
1.05
1.42
0.91
0.91
1.15
0.79
0.99
0.96
1.48
1.60
1.75
1.23
1.32
1.32
1.05
1.08
1.08
Vb1
Sealed
Vb1
Fb1
Vented
Vb1 Vb2
Bandpass
Fb2
Vb1(Filled)
0.61
0.73
0.77
0.91
1.30
1.35
0.77
1.09
1.04
Cu. Ft.
1.04
0.96
1.20
0.77
0.83
0.97
0.67
0.91
0.81
1.25
1.46
1.47
1.04
1.21
1.11
0.89
0.99
0.91
Vb2
-
-
1.15
-
-
1.33
-
-
1.17
(cu ft)
-
-
1.5
-
-
1.35
-
-
1.05
-
-
1.2
-
-
1.1
-
-
0.95
Q(tc)
0.9
0.85
0.8
0.74
0.66
0.63
0.8
0.71
0.7
0.85
0.77
0.78
0.65
0.63
0.61
-
0.7
0.75
0.66
0.8
0.8
0.72
0.7
0.68
0.68
0.75
0.74
0.74
F(B1)
3 2
-
-
3 4
-
-
4 0
-
-
-
3 7
-
-
3 0
-
(Hz)
-
3 5
-
-
3 7
-
-
3 1
-
-
3 4
-
Fb2
-
6 7
-
-
7 2
-
-
8 4
-
-
-
7 7
-
-
6 0
(Hz)
-
-
7 1
-
-
7 7
-
-
6 4
-
-
6 9
Vent Description
one 3" tube, 14.0" long two 3" tubes, each 2.0" long
one 3" tube, 14.75" long two 3" tubes, each 1.75" long
one 3" tube, 14.5" long two 3" tubes, each 1.5" long
one 3" tube, 11.75" long two 3" tubes, each 3.25" long
one 3" tube, 12.75" long two 3" tubes, each 3.25" long
one 3" tube, 13.25" long two 3" tubes, each 3.0" long
one 3" tube, 11.75" long two 3" tubes, each 5.75" long
one 3" tube, 13.75" long two 3" tubes, each 5.5" long
one 3" tube, 14.25" long two 3" tubes, each 5.5" 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
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