JL Audio J2500.1 Appendix A, Necessary Equipment, The Nine-Step Procedure, Input Section

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 connected, set the amplifier’s Remote Bass Control at maximum (full clockwise).

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). 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.” 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
4Ω	37 V
3Ω	35.5 V
2Ω	31.5 V

Appendix b:

J2-500.1 Specifications

General Specifications:

Recommended Fuse Value: 60A

Recommended Fuse Type: ANL at battery, 4x 15A ATC fuses on amplifier chassis.

Input Section:

Low-Level Input: Single-ended with RCA jacks

Low-Level Input Range: 200mV - 4V RMS

Amplifier Section:

Amplifier Topology: Class B Monaural with complementary bi-polar outputs

Power Supply: PWM switching type, unregulated Rated Power with less than 1% THD (14.4V supply): 340W RMS x 1 @ 4Ω

420W RMS x 1 @ 3Ω

500W RMS x 1 @ 2Ω

Frequency Response: 10 - 100 Hz (+/– 1 dB)

Crossover Section:

Low-Pass Filter: 12 dB/octave with continuously variable cutoff frequency selection from 40 - 130 Hz. Non-defeatable.

Preamp Outputs:

2-Channel, pass-through with unity gain, RCA-type jacks.

Bass Boost:

Single-band with 45 Hz center frequency, adjustable from 0 to +12dB.

Remote Level Control:

Via included, wired remote control knob. Full mute to 0 dB range.

Dimensions (LxWxH):

13.20" x 9.60" x 2.15" (335 mm x 244 mm x 55 mm)

Due to ongoing product development, all specifications are subject to change without notice.

10 JL Audio®

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