Bedienungsanleitung JL Audio JX400 (Seite 12 von 72) (Englisch)

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12 JL Audio

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 speakers from the

amplifier’s speaker output connectors (you need

only disconnect one wire on each output).

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

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

and amplifier. Set the source unit's fader control

to center position and its subwoofer level control

to 3/4 of maximum.

3) Turn the “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 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) 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 amplifier to

its maximum low-distortion output level,

reconnect the speaker(s) and listen to the

system. 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 re-adjust 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

Stereo Bridged

8

16.7 V 25.3 V

6

16.7 V 25.3 V

4

16.7 V 25.3 V

3

15.4 V not recommended

2

14.1 V not recommended

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