Thursday, March 14, 2013

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. Terminal Cup Removal
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.