Bedienungsanleitung JL Audio 12W7AE (Seite 14 von 16) (Englisch)

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Input Sensitivity “Gain” Setting Guide

for JL Audio Subwoofer Amplifiers

Following the directions below will allow you to easily adjust the input sensitivity of the amplifier(s), using commonly

available equipment. Properly setting levels according to this procedure will result in optimum amplifier performance

and improved system reliability.

Step 1:

Disconnect the speaker(s) from the amplifier.

Step 2:

Turn “Off” all processing on the source unit and

the amplifier (bass/treble, loudness, EQ, etc.).

Step 3:

Turn the input sensitivity control on the amplifier

all the way down. If there is a sensitivity range

switch, set it to the “low” position.

Step 4:

Set source unit volume to 3/4 of full volume.

This will allow for reasonable gain overlap

with moderate clipping at full volume.

Step 5:

Cross-reference the amplifier model used and

impedance load per channel on the chart below

to determine the target output voltage.

Step 6:

Verify that you 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. Selecting the source unit’s “Repeat

Track” feature (if applicable) will be helpful in this step.

Step 7:

Connect the AC voltmeter to the speaker output

of the amplifier.

Step 8:

Increase the input sensitivity control until the desired

voltage (determined in Step 5) is delivered. If multiple

subwoofer amps are being used, set each one to the same

exact voltage and you have also level matched them. On an

amplifier with a sensitivity range switch, if excessive voltage

is read with the control at minimum (full counterclockwise),

switch the “Input Voltage” to “High” and re-adjust.

Step 9:

Once you have adjusted each amp to its maximum

unclipped output level, turn down the volume of the

source unit and turn it off. Reconnect all the speakers,

turn the source unit on and proceed to adjust the

level balance between the subwoofer and satellite

amplifiers. This is accomplished by listening to the

system at a moderate level and turning DOWN the

input sensitivity controls of amplifiers that are playing

too loudly. Do NOT increase the input sensitivity of

any amplifier as this will defeat the purpose of this

procedure by permitting excessive clipping (distortion).

Necessary Equipment

• AC Voltmeter (Digital display recommended)

• A low-frequency (40 or 50 Hz) sine-wave test tone recorded at 0dB reference level.

Do not use attenuated test tones (-10dB, -20dB, etc.).

The Nine-Step Procedure:

Amplifier Voltage Chart

Impedance

HD750/1 HD1200/1 Slash 600/1v3 Slash 1200/1v3 XD600/1v2 JX500/1D JX1000/1D

3

47.4V

(750W)

60.0V

(1200W)

42.4V

(600W)

60.0V

(1200W)

38.7V

(500W)

34.6V

(400W)

47.4V

(750W)

1.5

33.5V

(750W)

42.4V

(1200W)

30.0V

(600W)

42.4V

(1200W)

not

recommended

not

recommended

not

recommended

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