Bedienungsanleitung JL Audio MHD750 (Seite 14 von 24) (Englisch)

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14 | JL Audio - MHD750/1 Owner’s Manual

Speaker loads below 1.5Ω 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 2.5 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 MHD750/1’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.

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.

“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 amplifier. 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 vessel chassis).

4) Alternating Red and Green: lights to indicate

that the amplifier is experiencing a fault

that may require service of the amplifier,

its wiring or the vessel’s charging system.

Audio is muted when this fault occurs. The

most likely cause of this fault is a low supply

voltage condition. If battery voltage drops

below 8.5 volts at any point, the amplifier

(except for the “Status” LED) will shut itself

off to protect itself and the vessel’s charging

system. If the voltage drops below 6 volts,

the “Status” LED will also turn off.

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