Bose Lifestyle PS28 Testverfahren - Seite 3

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PS28/48 Performance Verification Procedures

(With AV28 Media Center Console)

Test Setup

Using the Lifestyle

28/48 system's audio input

cable part number 260351-001, connect the

AV28 media center to the PS28/48 bass

module.

1. Sweep Test

1.1 Apply a 200 mVrms, 25 Hz signal to the left

and right AUX input of the AV28 media center.

Adjust the AV28 media center to full volume.

Listen for any extraneous noises such as

rubbing, scraping, or ticking coming from the

bass module.

Note: No extraneous noises such as rubbing,

scraping or ticking should be heard. To distin-

guish between normal suspension noise, rubs

and ticks, displace the woofer cone 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.

1.2 Sweep the bass module from 40 Hz to 300 Hz.

Listen carefully for any buzzes, rattles

or extraneous noises coming from the bass

module.

Note: Redress any wire or component that

buzzes.

2 Bass Module Air Leak Test

2.1 Apply a 200 mVrms, 40 Hz signal to the

AUX input of the AV28 media center.

2.2 Check for air leaks from the bass module

cabinet. Listen near the areas where the plastic

seals to the wood.

3. Cube Speaker Phase Test

Note: The DC voltage should only be momen-

tarily applied to the cube speaker input to avoid

damaging the speakers.

3. 1 Observing polarity, momentarily apply 8 Vdc to

the input of the cube speaker.

Note: Connect the positive side of the dc

supply to the positive input of the cube. Con-

nect the negative side of the dc supply to the

negative input of the cube speaker.

3.2 The speakers should move outward with

the application of the dc voltage. Check the

cube wiring if it moves inward.

4. Cube Speaker Sweep Test

4.1 Apply an 11 Vrms, 20 Hz signal directly to

the input of the satellite. Change the applied

signal to 8 Vrms, 150 Hz and the sweep the

oscillator from 150 Hz to 2 kHz.

4.2 Listen for rubs, ticks, air leaks, buzzes or

other extraneous noises.

Note: Defects such as rubs, ticks and air leaks

will typically be most audible during the 20 Hz

test. Defects such as buzzes will typically be

heard during the 150 Hz to 2 kHz sweep.

Note: The satellite cubes are not repairable.

The Jewel Cube

speakers are repairable.

5. Listening Test

5.1 Connect the cube speakers to the outputs

of the bass module.

5.2 Adjust the volume to a comfortable level

and listen for a clean undistored audio output

from the bass module and cube speakers.