Manual JL Audio M1000 (page 12 of 20) (English)

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12 | JL Audio -MD1000/1v2 Owner’s Manual

APPENDIX A:

Input Sensitivity Level Setting

Following the directions below will allow the

installer to adjust the input sensitivity of each

amplifier channel pair simply and easily in just a

few minutes using equipment which is commonly

available.

Necessary Equipment

• Digital AC Voltmeter

• CD with a sine-wave test tone recorded at

0 dB reference level in the frequency range

to be amplified for that set of channels

(50 Hz for subwoofer channels, 1 kHz for a

midrange application). Do not use attenuated

test tones (-10 dB, -20 dB, etc.).

The Nine-Step Procedure

1) Disconnect the subwoofer(s) from the

amplifier’s speaker output connectors.

2) Turn off all processing (bass/treble, loudness,

EQ, etc.) on the source unit, processors (if

used) and amplifier. Set fader control to center

position and subwoofer level control to 3/4 of

maximum (if used to feed the M1000/1v2).

3) Turn the amplifier’s “Input Sens.” control all

the way down.

4) Set the source unit volume to 3/4 of full

volume. This will allow for reasonable gain

overlap with moderate clipping at full volume.

5) Using the chart on this page, determine the target

voltage for input sensitivity adjustment according

to the nominal impedance of the subwoofer

system connected to the amplifier outputs.

6) Verify that you have disconnected the

subwoofer(s) before proceeding. Play a track

with an appropriate sine wave (within the

frequency range to be amplified by the

M1000/1v2) at 3/4 source unit volume.

7) Connect the AC voltmeter to the speaker output

connectors of the amplifier. Make sure you test

the voltage at the correct connectors (+ and –).

8) Increase the “Input Sens.” control until the

target voltage is observed with the voltmeter.

9) Once you have adjusted the M1000/1v2 to

its maximum low-distortion output level,

reconnect the speaker(s). The “Input Sens.”

controls can now be adjusted downward if the

amplifier requires attenuation to achieve the

desired system balance.

Do not increase any “Input Sens.” setting for

any amplifier channel or channel pair in the

system beyond the maximum level established

during this procedure. Doing so will result in

audible distortion and possible speaker damage.

It will be necessary to re-adjust the

“Input Sens.” if any equalizer boost is activated

after setting the “Input Sens.” with this

procedure. This applies to any EQ boost circuit,

including source unit tone controls or EQ

circuits. EQ cuts will not require re-adjustment.

Nom. Impedance Target AC Voltage

4 40.0 V

3 37.3 V

2 34.6 V

1

Not Recommended

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JL Audio M1000 Manual

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