Bedienungsanleitung JL Audio RD400 (Seite 14 von 20) (Englisch)

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14 | JL Audio - RD400/4 Owner’s Manual

APPENDIX A:

Input Sensitivity Level Setting

Follow the steps below to adjust the input

sensitivity of each amplifier channel pair, simply

and easily, in just a few minutes to achieve overall

system balance.

Necessary Equipment

• CD with a sine-wave test tone recorded at

0 dBfs 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.).

If your OEM source unit is not equipped with

a CD player, you may transfer the test tone to

a portable media player or thumb drive and

connect to your source unit’s auxiliary input.

Make sure to disable any EQ/DSP modes on

your portable media player during level setting.

The Seven-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 the fader control to

center position and the subwoofer level control

to 3/4 of maximum (if used to feed

the RD400/4).

3) Set the “Input Voltage” switch to “Low ”. Turn

both “Input Sensitivity” 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) 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 each channel pair

RD400/4) at 3/4 source unit volume.

6) Slowly increase the “Input Sensitivity”

control until the “Clipping” LED is solidly lit,

indicating maximum, unclipped output. If the

“Clipping” LED is solidly lit with the “Input

Sensitivity” control turned all the way down,

set the “Input Voltage” switch to the “High”

position, then slowly increase the “Input

Sensitivity” control until the “Clipping” LED

is solidly lit.

7) Once you have adjusted each channel section

on the RD400/4 to its maximum, unclipped

output level, reduce the source unit’s volume

to prevent sudden output bursts and reconnect

the speaker(s). Play music and adjust the “Input

Sensitivity” controls downward if the amplifier

requires attenuation to achieve the desired

system balance.

Do not increase any “Input Sensitivity” 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

Sensitivity” if any equalizer boost is activated

after setting the “Input Sensitivity” 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.

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