Bedienungsanleitung JL Audio M500 (Seite 14 von 20) (Englisch)

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14 | JL Audio - M500/3 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 in installation bays.

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 speaker(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 M500/3).

3) Turn all three “Input Sens.” controls 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 speaker system

connected to the amplifier outputs.

6) Verify that you have disconnected the speakers

before proceeding. Play a track with an

appropriate sine wave (within the frequency

range to be amplified by the channel you are

adjusting) at 3/4 source unit volume.

7) Connect the AC voltmeter to the speaker output

connectors of the amplifier. If the channel

pair is operating in stereo, it is only necessary

to measure one channel. If bridged, make sure

you test the voltage at the correct connectors

(L+ and R–).

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

target voltage is observed with the voltmeter.

9) Once you have adjusted each channel sectio

of the M500/3 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.

IMPORTANT

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 readjust the

“Input Sens.” for the affected channels 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

Kanal 1/2

(Stereo)

CH 1 & 2

(Bridged)

Subwoofer CH

8

17.4 V 34.8 V 24.5 V

6

17.4 V 32.8 V 24.5 V

4

17.4 V 28.2 V 24.5 V

3

16.4 V not recommended 26.9 V

2

14.1 V not recommended 26.8 V

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