JL Audio M600/6 Owner's Manual

6  |  JL Audio - M600/6 Owner’s Manual  

7

The M600/6’s input section allows you to send 

signals to the amplifier section through the use 
of two, four or six differential-balanced inputs.

Input connections are via up to three pairs of 

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If you wish to send six discrete channels into 

the M600/6, simply use all six inputs and set the 
iInput Modew switch in the i6 Ch.w position.

If you wish to feed all six channels by using 

only four channels of full-range input, set the 
iInput Modew switch in the to i4 Ch.w and use 
only the inputs to channels 1, 2, 3 & 4. In this 
mode, channels 5 & 6 will operate with a sum of 
the 1 & 3 and 2 & 4 input signals, respectively.

If you wish to feed all six channels by using 

two channels of full-range input plus two 
channels of low-frequency input (subwoofer 
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to split the full-range signals with y-adaptors and 
feed these signals into the inputs to channels 1 & 
2 and 3 & 4. The dedicated subwoofer signal will 
be sent to channels 5 & 6. 

If you wish to use only two channels of 

input to deliver signal to all six amplifier 
channels, set the 

iInput Modew switch to i2 

w and use only the inputs to channels 1 & 

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with the channel 1 signal and channels 4 & 
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Input Voltage Range: 

The M600/6’s input sections are designed to 

accept signal voltages from 100mV – 4V.  This 
will accommodate all preamp level signals and 
many speaker level signals.

To use speaker-level sources, simply splice the 

speaker output wires of the source unit onto a 
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If you find that the output cannot be reduced 

sufficiently with a direct speaker level signal 
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each channel section can be used to match the 
source unit’s output voltage to the input stage of 
each pair of amplifier channels for maximum 
clean output. Rotating the control clockwise will 
result in higher sensitivity (louder for a given 
input voltage). Rotating the control counter-
clockwise will result in lower sensitivity (quieter 
for a given input voltage.) 

 

 

To properly set the amplifier for maximum 

clean output, please refer to Appendix A (page 
14) in this manual. After using this procedure, 
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levels downward if this is required to achieve the 
desired system balance. 

The M600/6 uses a conventional +12V remote 

turn-on lead, typically controlled by the source 
unit's remote turn-on output. The amplifier will 
turn on when +12V is present at its 

iRemotew 

input and turn off when +12V is switched off. If 
a source unit does not have a dedicated remote 
turn-on output, the amplifier’s turn-on lead can 
be connected to +12V via a switch that derives 
power from an ignition-switched circuit.

The M600/6’s 

iRemotew turn-on connector is 

designed to accept 18 AWG – 12 AWG wire. To 
connect the remote turn-on wire to the amplifier, 
first back out the set screw on the top of the 
terminal block, using the supplied 2.5mm hex 
wrench. Strip 1/2 inch (12mm) of wire and insert 
the bare wire into the terminal block, seating it 
firmly so that no bare wire is exposed. While 
holding the wire in the terminal, tighten the set 
screw firmly, taking care not to strip the head of 
the screw and making sure that the wire (not the 
insulation) is firmly gripped by the set screw.