User Manual

3.0 Operation

3.1 Precautions

Your ampliﬁer is protected from internal and external faults, but you should still take

the following precautions for optimum performance and safety:

1. Before use, your ampliﬁer ﬁrst must be conﬁgured for proper operation,

including input and output wiring hookup. Improper wiring can result in serious

operating difﬁculties.

For information on wiring and conﬁguration, please consult the Setup section of

this manual.

2. Use care when making connections, selecting signal sources and controlling the

output level.

3. Always be sure to have all levels at minimum when connecting or disconnecting

audio sources from the inputs, especially when MIC is selected from the MIC/

LINE switch. Failure to do so may cause the ampliﬁer or speaker to go into a

protection mode or even cause damage.

4. WARNING: Never connect the output to a power supply, battery or power main.

Electrical shock may result.

5. Tampering with the circuitry, or making unauthorized circuit changes may be

hazardous and invalidates all agency listings.

6. Do not operate the ampliﬁer with the red Clip LEDs constantly ﬂashing.

7. Do not overdrive the mixer, which will cause clipped signal to be sent to

the ampliﬁer. Such signals will be reproduced with extreme accuracy, and

loudspeaker damage may result.

8. Do not operate the ampliﬁer with less than the rated load impedance. Due to

the ampliﬁer’s output protection, such a conﬁguration may result in premature

clipping and speaker damage.

9. Use the ampliﬁer in a well-ventilated environment and do not use it in ambient

temperature conditions in excess of 40°C. Failure to do so will result in the auto

disconnection from power supply, and the overheat auto protection function will

be activated. The power indicator will become green and there will not be any

audio signal coming out of the ampliﬁer. In this case, turn down the volume to

the minimum, and the ampliﬁer will soon resume working. When the ampliﬁer

returns to normal temperature the power indicator will return to blue and you

may turn the volume up to a safe level.

10. If the line voltage to the ampliﬁer is too low, the low voltage protection function

will be activated. The power light ring will change from blue to green.

CAUTION: JBL is not liable for damage that results from overdriving other

system components.