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TEST PROCEDURES
3. Woofer Rub and Tick Test
Satellite Speakers
3.1 Perform Disassembly/Assembly procedure 5. Do not cut the wires at the woofer assembly terminals.
Audio Signal Generator
Acoustimass Module
3.2 Connect a signal generator directly to the terminals of the woofer assembly under test. 3.3 Apply a 10 Hz, 10 Vrms signal to the woofer assembly.
Power Amplifier
Inputs
+
Outputs
+ -
3.4 Listen carefully for any extraneous noises such as rubbing, scraping, or ticking. Note: To distinguish between normal suspension noise and rubs or ticks, displace the cone slightly with your fingers. If the noise stays the same, it is normal suspension noise and the woofer is fine. Suspension noise will not be heard with program material. 4. System Sweep Test 4.1 Set up the system as shown in Figure 1. 4.2 Apply a 10 Hz, 10 Vrms sine wave to the left and right signal inputs. 4.3 While listening to the output of the system, sweep the input frequency slowly up from 10 Hz to 500 Hz. 4.4 The output should smoothly cross over from the bass module to the satellite speakers. 4.5 Reduce the input voltage level to 5 Vrms. 4.6 Continue sweeping from 500 Hz to 15 kHz. Replace any satellite assembly that buzzes or sounds distorted. Note: The Acoustimass 5 Series III satellite assemblies are non-repairable. If you have a defective satellite assembly, it must be replaced. 5
Figure 1. Acoustimass® 5 Series III Test Setup Diagram 1. Bass Module Air Leak Test 1.1 Apply a 100 Hz, 10 Vrms sine wave to the left and right channel inputs of the bass module. Do not connect the satellite speakers. 1.2 Listen carefully for air leaks from around the terminal cup and cabinet seams. Air leaks will be heard as a hissing or sputtering sound. All repairs must be hidden. Test duration should be 5 seconds minimum. 2. Woofer Phase Test 2.1 Apply a 50 Hz, 10 Vrms sine wave to the left and right channel inputs of the bass module. 2.2 While the signal is being applied to the bass module, remove the input to one of the channels. 2.3 The sound output level should drop by approximately half. If the sound output level increases or stays the same, then there is a wiring problem in the woofers.
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