"Status" Led / Protection Circuitry - JL Audio HD750/1 Owner's Manual

DIMPORTANTI
Speaker loads below 1.50 nominal are not
recommended and may cause the amplifier
output to distort excessively.
Speaker Connector Plugs
To connect the speaker wires to the amplifier,
unplug the speaker connector plug from the
amplifier chassis (pull back firmly) and back out
the set screws on the connector plug, using the
supplied 2.0 mm hex wrench. Strip 3/8 inch (10
mm) of insulation from the end of each wire and
insert the bare wire into the receptacle on the
speaker connector plug, seating
it
firmly so that
no bare wire is exposed. While holding each wire
in place, tighten each set screw firmly, taking care
not to strip the head of the screw.
You will notice that there are two sets of"+" and
"-" connections on the plug. This is to facilitate
multiple speaker wiring to the HD750/l's mono
output. The two positive and two negative
connections are connected in parallel inside the
amplifier. Connecting two speakers, each to
one set of positive and negative terminals, will
result in a parallel speaker connection. If only
connecting one pair of speaker wires, it is not
necessary to use both sets of connections.
DIMPORTANTI
Do not chassis ground any speakers connected
to this or any other JL Audio amplifier. Doing
so will cause the amplifier to go into protection
and mute the output.
14
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JL Audio - HD750/1 Owner's Manual
"STATUS" LED / PROTECTION CIRCUITRY
There is a single multi-color LED on the
control panel of the amplifier to indicate the
amplifier's operating status. This LED's behavior
is as follows:
1) Flashing Green: amplifier is powering up,
audio output is muted.
2) Constant Green: amplifier is on and
functioning normally, audio output is active.
3) Constant Red: lights to indicate that the
amplifier has exceeded its safe operating
temperature, putting the amplifier into a
self-protection mode, which reduces the
peak power output of the ampli fier. The red
light will turn green and the amplifier will
return to full-power operating mode when its
temperature returns to a safe level.
3) Constant Amber (yellow): lights to indicate
that the impedance of the speaker load
connected to the amplifier is lower than its
optimum load impedance range. When this
light is on, a protection circuit engages and
reduces the power output of the amplifier.
The amber indicator will also light when a
short-circuit is detected in the speaker wiring
(this can be a short between the positive and
negative speaker wires or between either
speaker wire and the vehicle chassis).