Muting
Turning the volume control knob completely
Controls on the Subwoofer
Treble
Bass 
Bass - Turn the knob marked Bass clockwise to increase the subwoofer level or counterclockwise to decrease the subwoofer level.
Treble – Turn the knob marked Treble clockwise to increase the treble level or counterclockwise to decrease the treble level.
Troubleshooting
SYMPTOM | POSSIBLE PROBLEM | SOLUTION | NOTE |
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No sound from Speakers | No power to unit. | Make sure wall power | Check green power LED on |
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| outlet or power strip has | the sub. Are the LED’s on? |
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| power. Make sure all | If the sub’s led is not on, |
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| switches for outlet/power | power is not getting to your |
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| strip are on and that all | speaker system. Try the |
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| switches for speaker | solutions shown. |
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| system are on. |
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| Is the control/right satellite of | Ensure that the control | There is an LED located in |
| your INVADER plugged in | speaker connector is | the bottom of each of the |
| correctly? | pushed in properly. | two satellite speakers. |
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| Remove the control /right | These should both be lit. If |
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| speaker connector from | they are, your speakers are |
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| the subwoofer, then re- | both plugged in correctly. |
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| connect this cable |
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| ensuring that the |
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| connector is pushed in |
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| properly. |
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Distortion (static, crackling | Noise may be caused by | Turn monitor off to see if |
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or hissing sounds) | interference from the | noise is eliminated. Move |
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| monitor. | speaker cables farther |
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| away from monitor. |
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| Speaker is being overdriven | Ensure that speaker is |
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| by an amplified audio | connected to the |
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| source. | appropriate receptacle. |
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| Check |
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| connectors when making |
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| connections. Make sure |
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| that all signal cables are |
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| inserted snugly into |
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| receptacles. |
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| Volume level on sound card | Check volume of sound |
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| may be too high. | card via Windows Volume |
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| Control. |
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| Sound card or audio source | Check speakers with | Disconnect speaker input |
| material may be cause of | another audio source. | cable (green connector) |
| problem. |
| from sound card and plug |
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| into CD ROM headphone |
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| jack. If static is eliminated, |
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| troubleshoot the soundcard. |
Document Number: | Description: MANUAL, JBL 4.1, All languages |
Revision: 06 |
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