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
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
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 A1400).
3)Switch the “Input Voltage” switch to “Low” and 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 by the A1400) 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 A1400 to its maximum
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
“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
Nom. Impedance | Target AC Voltage |
4Ω | 31.0 V |
3Ω | 29.7 V |
2Ω | 28.3 V |
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APPENDIX B:
Precise Frequency Selection Chart
“FILTER FREQ” AMP FILTER
Detent Panel Actual
Number Marking Freq.
Full counter-clockwise: 42
01 . . . . . . . . . . . . . . . . . . . . . . . . . . . .42 02 . . . . . . . . . . . . . . . . . . . . . . . . . . . .42 03 . . . . . . . . . . . . . . . . . . . . . . . . . . . .42 04 . . . . . . . . . . . “40” . . . . . . . . . . . .42 05 . . . . . . . . . . . . . . . . . . . . . . . . . . . .43 06 . . . . . . . . . . . . . . . . . . . . . . . . . . . .44 07 . . . . . . . . . . . . . . . . . . . . . . . . . . . .46 08 . . . . . . . . . . . “45” . . . . . . . . . . . .47 09 . . . . . . . . . . . . . . . . . . . . . . . . . . . .49 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . .50 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . .52 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . .53 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . .55 14 . . . . . . . . . . . “55” . . . . . . . . . . . .57 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . .58 16 . . . . . . . . . . . . . . . . . . . . . . . . . . . .60 17 . . . . . . . . . . . . . . . . . . . . . . . . . . . .63 18 . . . . . . . . . . . . . . . . . . . . . . . . . . . .65 19 . . . . . . . . . . . “65” . . . . . . . . . . . .67 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . .70 21 . . . . . . . . . . . . . . . . . . . . . . . . . . . .73 22 . . . . . . . . . . . . . . . . . . . . . . . . . . . .76 23 . . . . . . . . . . . . . . . . . . . . . . . . . . . .79 24 . . . . . . . . . . . “80” . . . . . . . . . . . .83 25 . . . . . . . . . . . . . . . . . . . . . . . . . . . .87 26 . . . . . . . . . . . . . . . . . . . . . . . . . . . .92 27 . . . . . . . . . . . . . . . . . . . . . . . . . . . .96 28 . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 29 . . . . . . . . . . .“100” . . . . . . . . . . 108 30 . . . . . . . . . . . . . . . . . . . . . . . . . . . 114 31 . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 32 . . . . . . . . . . . . . . . . . . . . . . . . . . . 131 33 . . . . . . . . . . . . . . . . . . . . . . . . . . . 143 34 . . . . . . . . . . . . . . . . . . . . . . . . . . . 157 35 . . . . . . . . . . . . . . . . . . . . . . . . . . . 184 36 . . . . . . . . . . .“200” . . . . . . . . . . 193 37 . . . . . . . . . . . . . . . . . . . . . . . . . . . 198 38 . . . . . . . . . . . . . . . . . . . . . . . . . . . 198 39 . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
Full-clockwise: 198
APPENDIX C:
A1400 Specifications
General Specifications:
Recommended Fuse Value: 40A
Recommended Fuse Type: AGU, AFS or MaxiFuse™
Input Sections:
No. of Inputs: One Stereo Pair
Input Type:
Input Range: Switchable from 200mV - 2V RMS to 800mV - 8V RMS
Amplifier Section:
Amplifier Topology:
Power Supply: Unregulated MOSFET switching type Rated Power at 12.5 V with less than
0.08% THD+Noise
240W RMS x 1 @ 4 ohms, 400W RMS x 1 @ 2 ohms Rated Power @ 14.4V with less than
1% THD + Noise
320W RMS x 1 @ 4 ohms, 500W RMS x 1 @ 2 ohms Signal to Noise Ratio: >90 dB referred to rated power
Amplifier Filter:
Amplifier
Preamp Output:
Buffered
Dimensions(LxWxH):
11.81" x 9.25" x 2.50" (300mm x 235mm x 63.5mm)
Due to ongoing product development, all specifications are subject to change without notice.
12 | JL AUDIO A1400 | JL AUDIO A1400 | 13 |