TABLE OF CONTENTS
Specifications ................................................................................................................................... |
1 |
|
Product Description ......................................................................................................................... |
2 |
|
Disassembly/Assembly Procedures .............................................................................................. |
3 |
|
Test Procedures ............................................................................................................................... |
4 |
|
Figure 1. |
Test Setup Diagram ......................................................................................................... |
4 |
Figure 2. |
Crossover Top Side and Etch Layout ............................................................................... |
5 |
Figure 3. FreeSpace® Model 1B Acoustimass® Module Schematic Diagram .................................. |
5 |
|
Figure 4. FreeSpace Model 1B Acoustimass Module Assembly Diagram ...................................... |
6 |
|
Part List .......................................................................................................................................... |
|
7-8 |
FreeSpace Model 1B Acoustimass Module (Per Figure 4) ........................................................... |
7 |
|
Figure 5. FreeSpace Model 1B Acoustimass Bass Module Rear Panel Label ............................... |
7 |
|
FreeSpace Model 1B Acoustimass Module Crossover Assembly (Per Figure 6) ...................... |
8 |
|
Figure 6. FreeSpace Model 1B Acoustimass Module Crossover Assembly ................................... |
8 |
|
Packing List ...................................................................................................................................... |
9 |
|
FreeSpace Model 1B Acoustimass Module (Per Figure 7) ........................................................... |
9 |
|
Figure 7. FreeSpace Model 1B Acoustimass Module Packing Diagram .......................................... |
9 |
|
|
SPECIFICATIONS |
External Dimensions: |
Bass Module: 19" x 14" x 7.5" |
|
Packed System: 26.2" x 19.8" x 10.6" |
Weight: |
Bass Module: 18.7 lb |
Transducer Complement: |
2 - 5 1/4" Woofers |
Power Handling: |
100 Watts per channel |
Usable Frequency Range: |
Bass Box: 55 Hz to 200 Hz |
Sensitivity: Pink Noise: |
76dB-spl, 1 Watt @ 1 Meter |
IEC Noise: |
78.6dB-spl, 1 Watt @ 1 Meter |
PROPRIETARY INFORMATION
THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF
BOSE® CORPORATION WHICH IS BEING FURNISHED ONLY
FOR THE PURPOSE OF SERVICING THE IDENTIFIED BOSE
PRODUCT BY AN AUTHORIZED BOSE SERVICE CENTER OR
OWNER OF THE BOSE PRODUCT, AND SHALL NOT BE
REPRODUCED OR USED FOR ANY OTHER PURPOSE.
1
PRODUCT DESCRIPTION
The FreeSpace® Model 1B Acoustimass® Module is a passive bass unit with a crossover at 200 Hz. The crossover will feed four (two per channel) 8Ω impedance, or eight
(four per channel) 4Ω impedance FreeSpace Model 6 loudspeakers. It offers several advantages over a powered bass box system.
•The FreeSpace Model 1B Acoustimass Module does not require the wiring of AC mains during installation. This can represent a significant savings in installation costs.
•The FreeSpace Model 1B Acoustimass Module is designed to be used with the AMPlus™ Series Amplifiers. It is able to take advantage of all of the features of the amplifiers, such as Opti-voice® paging, Dynamic EQ, Page Vectoring, Dynamic Compensation, and source selection.
•The FreeSpace Model 1B Acoustimass Module can also be used with the the Model 8, Model 32, and Model 25 loudspeakers to form a complete extended bandwidth system.
2
DISASSEMBLY/ASSEMBLY PROCEDURES
Note: Refer to Figure 4. for the following procedures.
1.Driver Removal
1.1Remove the six screws (5) that secure the rear cover (8) to the cabinet.
1.2Slide the rear cover off far enough to reach the woofer harness cables (10) on the crossover assembly (9).
1.3Unplug the woofer harness cables from the crossover assembly. You can now completely remove the rear cover.
1.4Remove the four screws (3) that secure the woofer assembly (2) to the cabinet.
1.5Cut the wires as close to the terminals as possible.
2.Driver Replacement
Note: Refer to Figure 3, FreeSpace® Model 1B Acoustimass® Module Schematic Diagram, for wiring information.
2.1Observing polarity, solder the woofer harness cable (10) leads to the woofer assembly (2).
2.2Secure the woofer assembly to the cabinet using the four screws (3) removed in Procedure 1.4.
Note: Be sure to re-align the woofer gasket (1) with the cabinet in order to make an airtight seal.
2.3Plug the connectors for the woofer harness cables onto the crossover assembly (9) located on the rear cover (8).
2.4Slide the rear cover back onto the bass box, and secure it using the six screws
(5) removed in Procedure 1.1.
3.Crossover Removal
3.1Remove the six screws (5) that secure the rear cover (8) onto the Acoustimass Bass Module.
3.2Slide the rear cover off of the bass box until you can reach the connectors for the woofer harness cables (10).
3.3Unplug the woofer harness
cables from the crossover assembly (9).
3.4Unplug the connector harness assembly (7) from the crossover assembly.
3.5Remove the four screws that secure the crossover assembly to the rear panel.
4.Crossover Replacement
4.1Mount the crossover assembly (9) to the rear cover (8) using the four screws removed in Procedure 3.5.
4.2Plug the connector harness
assembly (7) onto the crossover assembly.
4.3Plug the woofer harness cables (10) onto the crossover assembly.
4.4Secure the rear cover to the Acoustimass Bass Module using the six screws (5) removed in Procedure 3.1.
3
TEST PROCEDURES
1.Rub and Tick Test
1.1Perform Disassembly/Assembly Procedure 1.1-1.4 in order to gain access to the driver to be tested.
1.2Apply a 10 Volt rms, 10 Hz signal to the driver input terminals.
1.3Replace any driver that has a rubbing or ticking noise. Quiet ticks are acceptable if they cannot be heard at a distance of 1 foot.
Note: To distinguish between normal suspension noise and rubs or ticks, displace the surround of the driver slightly with your fingers. If the noise can be made to go away, or get worse, it is a tick or a rub, and the driver should be replaced. If the noise stays the same, it is suspension noise and the driver is fine. Suspension noises will not be heard with program material.
2.Air Leak Test
2.1Perform test setup in Figure 1. Test Setup Diagram, but do not connect the satellite speakers.
2.2Apply a 14 Vrms, 45 Hz signal to the bass module.
2.3Listen carefully for air leaks (audible as a whistling or sputtering sound) at cabinet seams. Minimum listening time should be 5 seconds/test.
3.System Sweep Test
3.1Connect the system as in Figure 1. Test Setup Diagram.
Note: Refer to Figure 5. for the Acoustimass® Bass Module Rear Panel Label diagram.
3.2 Apply a 14 Vrms, 10 Hz signal to both the left and right inputs.
3.3 Sweep the oscillator from 10 Hz to 500 Hz. Sweep rate shall be 3-5 seconds. Listen carefully for buzzes, rattles, or other noises.
Note: A whooshing noise from the bass box ports at approximately 45 Hz and 110 Hz is acceptable (port tuned frequencies).
Note: A small air leak at the input/output terminal is acceptable.
3.4Reduce input signal to 4 Vrms, 500 Hz.
3.5Sweep the oscillator from 500 Hz to
7 kHz. Sweep rate shall be 3-5 seconds. Listen carefully for buzzes, rattles, or other noises.
3.6Repeat sweep test for LEFT channel only, then for RIGHT channel only.
3.7Listen for any extraneous noises.
- + |
- + |
+ - |
+ - |
Satellites |
|
Bass Module |
- + - + + - + - + - - + |
Audio Signal |
|
Generator |
+ -
+ - - + |
+ - |
Outputs Input
Power Amplifier
Figure 1. Test Setup Diagram
4
Loading...