Boston Acoustics 10.5LF User manual

Boston Acoustics Subwoofer
Installation Manual
ProSeries 12.5LF
10.5LF
8.5LF
Competitor Series 1500
1200
1000
800
Generator Series GS1500
GS1200
GS1000

2
Congratulations!
You have purchased the finest automotive subwoofer the
industry has to offer. Installed correctly, the ProSeries
subwoofers will offer unprecedented performance for
many years to come.
Warning
This manual explains only the basic installation of the
subwoofers—not the techniques required to perform the
installation. If you do not have the experience that these
procedures require, we strongly suggest you consult your
Boston Acoustics dealer about professional installation.
Table of Contents
Enclosure Recommendations 3
Building an Enclosure 5
Locating Subwoofer Enclosure In Vehicle 6
Hatchbacks/Sport Utility Vehicles 6
Sedans 7
Wiring 8
2 ohm subwoofers 8
4 ohm subwoofers 9
Specifications 10
Theile/Small Parameters 10

3
Enclosure Recommendations
The ProSeries and Competitor Series subwoofers are
designed to deliver optimum performance in small
sealed enclosures. The Generator Series subwoofers are
designed for either sealed or ported enclosures. The fol-
lowing are the recommended enclosure volumes:
Sealed Enclosures 12.5LF 10.5LF 8.5LF 1500 1200 1000 800 GS1500 GS1200 GS1000
Gross Internal Volume 1.0ft30.5ft30.3ft31.5ft31.0ft30.5ft30.3ft32.5ft31.5ft3.75ft3
-3dB Down Point—In Car 20Hz 20Hz 20Hz 20Hz 20Hz 20Hz 20Hz 20Hz 20Hz 20Hz
System "Q" (2Ω) 0.9 0.8 0.6 1.36 1.03 0.92 0.69 1.63 1.38 1.18
(4Ω) 1.1 0.95 0.7 1.56 1.12 0.98 0.73 1.5 1.29 1.09
Recommended Enclosure Dimensions (Internal)
Height 10.5" 7.5" 6.5" 10" 10.5" 7.5" 6.5" 20" 16" 12"
Width 13.0" 11.0" 9.0" 16" 13.0" 11.0" 9.0" 16" 14" 11"
Depth 13.0" 11.0" 9.0" 16" 13.0" 11.0" 9.0" 13.5" 12" 9.75"
Ported Enclosures (Generator Series only) GS1500 GS1200 GS1000
Gross Internal Volume 2.5ft31.5ft31.25ft3
Tuning Frequency 35Hz 35Hz 33Hz
Port Diameter 4"D 3"D 3"D
Port Length 11"L 7.3"L 11"L
Recommended Enclosure Dimensions (Internal)
Height 20" 16" 14"
Width 16" 14" 11.5"
Depth 13.5" 12" 14"
ProSeries Competitor Series Generator Series

4
Calculating your enclosure volume:
Internal dimensions
Height (inches) x Width (inches) x Depth (inches) = Gross Internal Volume (cubic inches)
Remember to account for material thickness when
determining external dimensions.
Gross Internal Volume (cubic inches)
1728
or:
= Gross Internal Volume (cubic feet)
= Gross Internal Volume (liters)
Height (cm) x Width (cm) x Depth (cm)
1000
Conversion Formulas
1" = 2.54cm
1ft3= 28.32 liters
1ft3= 1,728in3
D
W
H

5
Building an Enclosure
Use at least 3 ⁄4-inch MDF to build the enclosure (1-inch is
preferable). The joints should be liberally glued with car-
penter’s wood glue and screwed together with wood
screws and sealed internally with a bead of silicone rub-
ber or hot melt glue.
Drill pilot holes to prevent the wood from splitting and
tighten the screws as much as possible. Excess glue can
be wiped off with a damp sponge or paper towel.
Warning
It is extremely important to completely seal the enclo-
sure. Even small leaks can have a dramatic effect on sub-
woofer performance. Look, listen, and test for leaks at all
joints, around the subwoofer perimeter, and at the wire
entrance location.
Screws
Glue
Sealant

6
Locating Subwoofer Enclosure
in Vehicle
The placement of the enclosure is one of the most
important factors concerning installation. As each vehi-
cle’s interior acoustics are different, experimentation is
the key to optimizing performance.
Hatchbacks/Sport Utility Vehicles
Locate the enclosure in a rear corner for maximum out-
put. Experiment with the subwoofer’s placement.
Hatchback Installation
Warning
Make sure the enclosure is securely mounted in such a
way as to not shift or fly forward in the event of an acci-
dent or sudden stop.

7
Sedans
Provide as clear a path as possible into the cabin by
venting through a folded-down arm rest, venting through
the rear deck, or venting through an unused speaker
opening in the rear deck. Keep any restrictive materials
such as wood, hard plastic or metal from directly block-
ing the subwoofer.
Sedan Installation

8
Wiring
2 ohm subwoofers
One 2Ωsub Two 2Ωsubs, series Two 2Ωsubs, parallel
Three 2Ωsubs, series Four 2Ωsubs, series/parallel

9
Wiring
4 ohm subwoofers
One 4Ωsub Two 4Ωsubs, parallel Three 4Ωsubs, parallel
Four 4Ωsubs, series/parallel Four 4Ωsubs, parallel

10
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) 91⁄8" (232mm) 73⁄16" (183mm) 137⁄8" (353mm)
Mounting Depth—Front Mounted 55⁄8" (143mm) 43⁄4" (121mm) 41⁄16" (104mm) 73⁄4" (197mm)
Mounting Depth—Rear Mounted 63⁄8" (162mm) 5" (127mm) 411⁄16" (119mm) 81⁄4" (210mm)
Recommended Amplifier Power 50–1200 watts 50–1100 watts 50–750 watts 50–1000 watts
Nominal Impedance 2Ω/4Ω2Ω/4Ω2Ω/4Ω2Ω/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 (Fs)30Hz 31Hz 33Hz 34Hz 35Hz 36Hz 34Hz 35Hz
Equivalent Volume (Vas)84 liters 84 liters 35 liters 35 liters 21 liters 21 liters 155 liters 155 liters
2.97ft32.97ft31.24ft31.24ft30.74ft30.74ft35.47ft35.47ft3
Total Q (Qts )0.45 0.57 0.44 0.53 0.33 0.40 0.72 0.85
Electrical Q (Qes)0.47 0.61 0.47 0.57 0.35 0.42 0.81 0.97
Mechanical Q (Qms)9.8 9.6 8.0 7.8 9.0 9.0 8.3 8.3
Compliance (Cms)230µm/N 230µm/N 255µm/N 255µm/N 330µm/N 330µm/N 142µm/N 142µm/N
Moving Mass (Mms)121g 117g 90g 86g 63g 60g 148g 145g
Cone Area (Sd) 510cm2510cm2315cm2315cm2215cm2215cm2876cm2876cm2
Voice Coil Diameter 51mm 51mm 51mm 51mm 51mm 51mm 51mm 51mm
Voice Coil DCR (Re)1.6Ω3.1Ω1.6Ω3.1Ω1.6Ω3.1Ω1.6Ω3.2Ω
Voice Coil Inductance @ 1kHz (Le)0.40mH 0.55mH 0.40mH 0.55mH 0.40mH 0.55mH 0.45mH 0.62mH
Linear Excursion—One Way (Xmax)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 (ηo)0.46 0.39 0.26 0.25 0.25 0.22 0.73 0.64
ProSeries Competitor Series
ProSeries Competitor Series