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We provide Theile/Small Parameters for those interested in
studying subwoofers further. We do not recommend you use
computer software to determine enclosure sizes or type.
While high–end enclosure design software may be useful for
engineering purposes, it cannot completely predict perform-
ance in a given vehicle and should not replace a real enclosure
that has been tested and listened to in a car. Please use our
recommended enclosures for optimum performance.
Specifications 12.5LF 10.5LF 8.5LF 1500
Nominal Size 12" (30cm) 10" (25cm) 8" (20cm) 15" (38cm)
Mounting Cutout Diameter 11" (280mm) 9
1
⁄8" (232mm) 7
3
⁄16" (183mm) 13
7
⁄8" (353mm)
Mounting Depth—Front Mounted 5
5
⁄8" (143mm) 4
3
⁄4" (121mm) 4
1
⁄16" (104mm) 7
3
⁄4" (197mm)
Mounting Depth—Rear Mounted 6
3
⁄8" (162mm) 5" (127mm) 4
11
⁄16" (119mm) 8
1
⁄4" (210mm)
Recommended Amplifier Power 50–1200 watts 50–1100 watts 50–750 watts 50–1000 watts
Nominal Impedance 2Ω/4Ω 2Ω/4Ω 2Ω/4Ω 2Ω/4Ω
Theile/Small Parameters
12.5LF 12.5LF 10.5LF 10.5LF 8.5LF 8.5LF 1500 1500
(2Ω) (4Ω)(2Ω)(4Ω)(2Ω)(4Ω)(2Ω)(4Ω)
Resonant Frequency (F
s
) 30Hz 31Hz 33Hz 34Hz 35Hz 36Hz 34Hz 35Hz
Equivalent Volume (V
as
) 84 liters 84 liters 35 liters 35 liters 21 liters 21 liters 155 liters 155 liters
2.97ft
3
2.97ft
3
1.24ft
3
1.24ft
3
0.74ft
3
0.74ft
3
5.47ft
3
5.47ft
3
Total Q (Q
ts
) 0.45 0.57 0.44 0.53 0.33 0.40 0.72 0.85
Electrical Q (Q
es
) 0.47 0.61 0.47 0.57 0.35 0.42 0.81 0.97
Mechanical Q (Q
ms
) 9.8 9.6 8.0 7.8 9.0 9.0 8.3 8.3
Compliance (C
ms
) 230µm/N 230µm/N 255µm/N 255µm/N 330µm/N 330µm/N 142µm/N 142µm/N
Moving Mass (M
ms
) 121g 117g 90g 86g 63g 60g 148g 145g
Cone Area (S
d
) 510cm
2
510cm
2
315cm
2
315cm
2
215cm
2
215cm
2
876cm
2
876cm
2
Voice Coil Diameter 51mm 51mm 51mm 51mm 51mm 51mm 51mm 51mm
Voice Coil DCR (R
e
) 1.6Ω 3.1Ω 1.6Ω 3.1Ω 1.6Ω 3.1Ω 1.6Ω 3.2Ω
Voice Coil Inductance @ 1kHz (L
e
) 0.40mH 0.55mH 0.40mH 0.55mH 0.40mH 0.55mH 0.45mH 0.62mH
Linear Excursion—One Way (X
max
) 8.5mm 8.5mm 8.5mm 8.5mm 8.5mm 8.5mm 5.5mm 5.5mm
Peak-to-Peak Maximum Excursion 40mm 40mm 35mm 35mm 35mm 35mm 40mm 40mm
Reference Efficiency (
η
o
) 0.46 0.39 0.26 0.25 0.25 0.22 0.73 0.64
ProSeries Competitor Series
ProSeries Competitor Series