JobSite Systems A30-X12 - Manual (Page 9)

7
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.