BOSE ACOUSTIMASS 10 REPAIR Procedure
SPECIFICATIONS
External Dimensions: Satellites: 3.15 x
6.1 x 4.1 in. (8.0 x 15.5 x 10.5 cm)
Bass Module: 14 x 7.5 x 21.5 in. (35.5
x 19 x 54.6 cm)
Weight: Single Satellite: 2.4 lb. (1.8
kg)
Bass Module: 26.4 lb. (12 kg)
Packed System: 50 lb. (23kg)
Sensitivity: Satellites: ≥ 83 dBspl,
400 Hz octave
Bass Module: ≥ 83 dBspl (100 Hz
octave band, front
channels, 125 Hz 1/3rd octave band rear channels)
Crossover Frequency:
≤ 200 Hz at 6 dB/oct.
System Protection:
PTC, Lamp, Resistor
Impedance: ≥ 6 Ohms,
nominal, 4.8 Ohms minimum from
0 Hz - 20 kHz, all channels
Power Handling,
all channels:
≥ 100 Watts
continuous per IEC-268-5 for
100 hours.Recommended amplifier /
receiver
power 10-200 Watts per channel.
PRODUCT DESCRIPTION
The Bose Acoustimass 10 Series II
Loudspeaker System uses five identical extended response satellite speakers that are 20
percent smaller than Series I versions. The satellite speaker assemblies reproduce the middle
and high frequencies of five full-range channels. The satellite speaker assemblies are
non-repairable. This system is compatible with all
consumer multi-channel formats including Dolby Pro Logic, Dolby Digital, DTS, and stereo encoded
music and movie program material. Acoustimass 10 Series II Bass Module
Description
Left woofer
Reproduces all left channel low
frequency information. This woofer is loaded by the Acoustimass 10 enclosure in such a way
as to produce deep bass energy.
Right woofer
Reproduces all right channel low
frequency information. This woofer is loaded by the Acoustimass 10 enclosure in such a way
as to produce deep bass energy.
Surround woofer
Reproduces all left and right surround
channel low frequency information. This woofer uses a dual voice coil that
electromagnetically sums the left and right surround channel bass energy. The woofer cone then
reproduces the summed left and right surround channel and sends it into the energy
summing chamber (acoustic spring C).
Acoustic Spring A
This is the volume of air in the rear
chamber (in front of the left and right channel woofers). This volume of air acts like
a spring and acoustically couples the fronts of the left and right woofers to acoustic mass
A.
Acoustic Mass A
This is the longer of the two internal
ports and, together with Acoustic spring A, serves to reproduce the lower frequencies of
the bass module, while reducing the cone excursion of the left and right woofers
over this lower frequency range (35Hz to 60Hz).
Acoustic Spring B
This is the volume of air in the middle
chamber (behind the left and right channel woofers). This volume of air acts like
a spring and acoustically couples the rear of the left and right woofers to acoustic mass
B.
Acoustic Mass B
This is the shorter of the two internal
ports and, together with Acoustic spring B, serves to reproduce the upper frequencies of
the bass module, while reducing the cone excursion of the left and right woofers
over this upper frequency range (120Hz to 200Hz).
Acoustic Spring C (The Energy Summing
Chamber)
This is the front most volume of air
inside the AM-10 bass module. This is where the bass is summed. Within this chamber, the front
channel bass energy is received via acoustic mass A and B, the surround channel bass
energy is received directly from the surround woofer. All front and surround channel bass
energy is summed within this chamber in much the same way as a room would sum the bass
energy from two separate bass modules. The
key difference with internal bass
summing is the results of summation are much better controlled because the summation
conditions are already known (in a room with two bass sources, their distance from each
other and their location within the room heavily influence bass summation and the
loudspeaker designer cannot predict that ahead of time). Another important purpose of this
chamber is it interacts with Acoustic Mass C to provide an extra stage of low pass
filtering to create a steeper high frequency roll off slope for the bass module, which serves
to reduce localization.
Acoustic Mass C
This is the exit port of the bass
module and serves to launch the bass energy into the room on a column of air (purifying, of
course). This port also interacts with Acoustic Spring C to reproduce the middle range
of frequencies of the bass module, while reducing the cone excursion of all the
woofers over this middle range (60Hz to 120Hz). This port is flared to eliminate any
internal air turbulence, which significantly improves the efficiency of the entire bass
module at high listening levels.
Acoustic Spring D
This is the volume of air enclosing the
rear portion of the surround channel woofer. Its main purpose is to load the surround
woofer and to help reduce cone excursion.
DISASSEMBLY/ASSEMBLY PROCEDURES
1.1 Using a phillips-head screwdriver, remove the eight screws (3) that
secure
the terminal cup (11) to the bass
module cabinet.
1.2 Gently pull the terminal cup away
from the cabinet. Slide the crossover
assembly (7) part way out through the end panel
of the bass module.
1.3 Unplug the cables (5 &6) from
the connectors on the crossover assembly.
Slide the crossover assembly fully out of the bass module
2. Terminal Cup Replacement
2.1 Insert the crossover assembly (7) partially into the end panel of the
bass
module.
2.2 Connect the cables (5 &6) to
the connectors on the crossover assembly.
2.3 Place the terminal cup (11) onto
the bass module cabinet. Make sure it is
fully seated against the cabinet.
2.4 Replace the eight phillips-head
screws
(3) removed in procedure 1.1. Do not over tighten the screws.
3. Crossover Assembly Removal
3.1 Perform procedure 1.
3.2 Using a phillips-head screwdriver, remove the three screws (12) that
secure
the crossover assembly (7) to the
terminal cup (11).
3.3 Slide the crossover assembly off of
the tabs located on the terminal cup.
4. Crossover Assembly Replacement
4.1 Slide the crossover assembly (7)
onto
the tabs located on the terminal cup (11).
4.2 Secure the crossover assembly to
the terminal cup, using the three screws
(12) removed in procedure 3.2.
4.3 Perform procedure 2.
5. Woofer Assembly Removal
5.1 Perform procedure 1.
5.2 Using a clean rag or similar
object, plug the port tube between the woofer
assemblies to prevent dropping
objects into the non-accessible portion of the
bass module cabinet.
5.3 Remove the four screws that secure the woofer assembly you wish to
remove to the cabinet.
5.4 Lift the woofer assembly out of
the cabinet and cut the wires as close to
the
terminals as possible. Be sure to
retain the woofer gasket for replacement.
6. Woofer Replacement
6.1 Strip the woofer cable wires.
6.2 Using a few small pieces of
cellophane tape, secure the new woofer gasket to the woofer assembly . This will hold
it in place while you install the woofer
assembly into the bass module cabinet.
6.3 Solder the woofer cable wires to
the woofer assembly.
6.4 Secure the woofer assembly in
place using the four screws removed in
procedure 5.3.
6.5 Remove the object used to block
the woofer port in step 5.2.
6.6 Perform procedure 2.
