Boston Acoustics 12.5LF, 10.5LF, 8.5LF Guide
Specifications subject to change without notice. Boston and Boston Acoustics ar
Technical Information
Theile/Small Parameters: 12.5LF(2Ω) 12.5LF(4Ω) 10.5LF(2Ω) 10.5LF(4Ω) 8.5LF(2Ω) 8.5LF(4Ω)
Resonant Frequency (Fs) 30Hz 31Hz 33Hz 34Hz 35Hz 36Hz
Equivalent Volume (Vas) 84 liters 84 liters 35 liters 35 liters 21 liters 21 liters
2.97ft
3
2.97ft
3
1.24ft
3
1.24ft
3
0.74ft
3
0.74ft
3
Total Q (Qts) 0.45 0.57 0.44 0.53 0.33 0.40
Electrical Q (Qes) 0.47 0.61 0.47 0.57 0.35 0.42
Mechanical Q (Qms) 9.8 9.6 8.0 7.8 9.0 9.0
Compliance (Cms) 230µm/N 230µm/N 255µm/N 255µm/N 330µm/N 330µm/N
Moving Mass (Mms) 121g 117g 90g 86g 63g 60g
Cone Area (Sd) 510cm
2
510cm
2
315cm
2
315cm
2
215cm
2
215cm
2
Voice Coil Diameter 51mm 51mm 51mm 51mm 51mm 51mm
Voice Coil DCR (Re) 1.6Ω 3.1Ω 1.6Ω 3.1Ω 1.6Ω 3.1Ω
Voice Coil Inductance @ 1kHz (Le) 0.40mH 0.55mH 0.40mH 0.55mH 0.40mH 0.55mH
Linear Excursion—One Way (Xmax) 8.5mm 8.5mm 8.5mm 8.5mm 8.5mm 8.5mm
Peak-to-Peak Max. Excursion 40mm 40mm 35mm 35mm 35mm 35mm
Reference Efficiency (ηo) 0.46 0.39 0.26 0.25 0.25 0.22
Specification: 12.5LF 10.5LF 8.5LF
Nominal Size 12" (30cm) 10" (25cm) 8" (20cm)
Mounting Cutout Diameter 11" (280mm) 9-1/8" (232mm) 7-3/16" (183mm)
Mounting Depth—Front Mounted 5-5/8" (143mm) 4-3/4" (121mm) 4-1/16" (104mm)
Mounting Depth—Rear Mounted 6-3/8" (162mm) 5" (127mm) 4-11/16" (119mm)
Recommended Amplifier Power 50–1200 watts 50–1100 watts 50–750 watts
Nominal Impedance 2Ω/4Ω 2Ω/4Ω 2Ω/4Ω
Recommended Enclosure Sizes:
Gross Internal Volume 1.0ft3 (28 liters) 0.5ft3 (14 liters) 0.3ft3 (8.5 liters)
-3dB Down Point (In-car) 20Hz 20Hz 20Hz
System "Q" (2Ω/4Ω) 0.9/1.1 0.8/0.95 0.6/0.7
Recommended Enclosure Dimensions:
Height (Internal) 10.5" (27cm) 7.5" (19cm) 6.5" (16cm)
Width (Internal) 13.0" (33cm) 11.0" (28cm) 9.0" (23cm)
Depth (Internal) 13.0" (33cm) 11.0" (28cm) 9.0" (23cm)
We provide Theile/Small Parameters for those interested in studying subwoofers further. We do not recommend
you use computer software to determine enclosure size or type. While high-end enclosure design software may
be useful for preliminary engineering purposes, it cannot completely predict performance in a given vehicle and
should not replace a real enclosure that has been tested and listened to in a car. The best a computer screen can
do is give you a visual representation of what something sounds like. Please use our recommended enclosur es for
optimum performance.
300 Jubilee Drive Peabody, MA 01960 978-538-5000 Fax: 978-538-5199
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