JobSite Systems A30-X12 manual OPERATION Power LED, Active LED, Power Switch, D.C. Protection

OPERATION

Power LED

The power LED indicates that the AC cord is plugged into a working AC power receptacle and that the power switch is in the "On" position.

Active LED

The rear panel turn-on mode switch determines when and how the amplifier will turn on. The "Active" LED indicates that the amplifier is on.

Power Switch

The front panel switch is a master or "vacation" power switch. No matter which turn-on mode you have selected, the master power switch will turn off all circuitry—including the sensing circuitry. If you are going on vacation and/or would like to reduce power consumption while you are away, turn the master power switch “off” (push the rocker switch out). When you would like to return to normal operation, turn the switch "On" (push the rocker switch in).

NOTE: This piece of equipment is not completely disconnected from the main power source when the Master Power Switch is in the OFF position. To completely disconnect unit from AC power, remove the removable AC Power Cord.

D.C. Protection

In the event a damaging D.C. signal becomes present on any of the speaker terminals, the D.C. protection circuit shuts down the entire amplifier and the red LED labeled “Protection” illuminates. To reset the amplifier you must turn the front panel power switch “off” and then “on.”

Listening at Higher Volumes

Thirty watts is enough power to play a conventional speaker in a normal sized room loudly enough to completely drown out conversation. Even at levels like that, the A30-X12 will sound clear and clean. However, it requires more power to achieve a reasonable volume of sound in a large room than it does in a small room. It is possible to turn the volume so high that the amplifier runs out of power. This creates "clipping" distortion.

Clipping distortion makes treble sound very harsh and unmusical. When you hear harsh sounding treble from any good speaker, turn the volume down immediately!

If you continue to operate the amplifier at "clipping" power levels the protection circuits will operate when the amplifier overheats. The protection circuits reset when the amplifier's internal circuitry cools. Reduce the volume to prevent a reoccurrence. Perpetually overdriving your speakers and amplifier is abuse and probably voids the manufacturer’s warranty of all affected products.

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