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1. Disassembly/Assembly Procedures

1. Woofer Rub and Tick Test

1.1 Apply a 10Vrms, 10Hz signal to the

front left and right input.

Note: No extraneous noises such as

rubbing, scraping or ticking should be

heard. To distinguish between normal

suspension noise, rubs and ticks, displace

the cone on the woofer with your finger. If

the sound can be made to go away or get

worse, it's a rub or tick and the woofer

should be replaced. If the noise stays the

same, it's normal suspension noise and it

will not be heard with regular program

material. Perform this test for the surround

channel.

2. Power Sweep Test

2.1 Apply a 10Vrms, 10Hz signal to all the

bass module inputs.

2.2 Sweep the oscillator slowly from 10Hz

to 1KHz and back to 10Hz.

2.3 Listen carefully for any buzzes, rattles

or extraneous noises coming from the bass

module or cubes.

Note: Redress any wire or component that

buzzes.

3. Woofer Phase Test, Front Channels

3.1 Apply a 10Vrms, 50Hz signal to the left

and right front channels.

3.2 Disconnect the right channel. If the

sound output from the bass module drops

by approximately 1/2, the woofer is in

phase. If the sound output from the bass

module increases, stays the same or stops

completely, the woofer may be wired

incorrectly or be defective.

4. Woofer Phase Test, Surround Channel

4.1 Apply a 10Vrms, 50Hz signal to the left

and right surround channels.

TEST PROCEDURES

4.2 Disconnect the left surround channel. If

the sound output from the bass module

drops by 1/2, the woofer is in phase. If the

sound output from the bass module in-

creases, stays the same or stops com-

pletely, check for incorrect wiring at the

crossover assembly.

Note: The surround woofer is not service-

able.

5. Air Leak Test

5.1 Apply a 10Vrms, 10Hz signal to the left

and right surround channel input.

5.2 Listen at the bass module port for

internal air leaks coming from inside the

unit.

5.3 Apply a 10Vrms, 50Hz signal to all the

bass module inputs.

5.4 Listen for air leaks from the bass

module.

6. Twiddler™ Phase Test

6.1 Apply 9V DC to the cube input termi-

nal. Connect the positive side of the DC

supply to the positive side of the cube.

Connect the negative side of the DC supply

to the negative side of the cube. The

twiddler should move outward.

Note: The DC voltage should only be

momentarily applied to avoid possible

damage to the twiddler.