Appendix a, Appendix B, Appendix C | JL Audio A1800 specification

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 used to feed the A1800).

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 A1800) 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 A1800 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	43.8 V
3Ω	42.0 V
2Ω	40.0 V

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:

A1800 Specifications

General Specifications:

Recommended Fuse Value: 80A

Recommended Fuse Type: AGU, AFS, ANL or MaxiFuse™

Input Sections:

No. of Inputs: One Stereo Pair

Input Type: Differential-balanced with RCA jack inputs

Input Range: Switchable from 200mV - 2V RMS to 800mV - 8V RMS

Amplifier Section:

Amplifier Topology: H-Bridge, Class D Mono with patented discrete drive circuitry

Power Supply: Unregulated MOSFET switching type Rated Power at 12.5 V with less than

0.08% THD+Noise (20-250 Hz):

480W RMS x 1 @ 4 ohms, 800W RMS x 1 @ 2 ohms Rated Power @ 14.4V with less than

1% THD + Noise (20-250 Hz):

640W RMS x 1 @ 4 ohms, 1000W RMS x 1 @ 2 ohms Signal to Noise Ratio: >95 dB referred to rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth) Frequency Response: 10 - 250 Hz (+0, -1 dB) Damping Factor: >500 @ 4 ohms/50 Hz, >250 @ 2 ohms/50 Hz

Amplifier Filter:

Amplifier Low-Pass Filter: State-variable, 12 dB/octave Butterworth or 24 dB/octave Linkwitz-Riley with continuously variable cutoff frequency selection from 40 - 200 Hz. Defeatable.

Preamp Output:

Buffered pass-through type.

Dimensions(LxWxH):

15.75" x 9.25" x 2.50" (400mm x 235mm x 63.5mm)

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

JL AUDIO A1800

A1800 specifications

The JL Audio A1800 is a powerhouse in the realm of automotive audio amplifiers, designed to deliver exceptional sound quality and unparalleled performance. This Class D amplifier is engineered to provide robust power output while maintaining high efficiency, making it a popular choice among audiophiles and car audio enthusiasts alike.

One of the standout features of the A1800 is its impressive power rating. With a continuous output of 800 watts RMS at 1 ohm, it can easily drive a wide range of subwoofers, providing deep, impactful bass that brings music to life. This amplifier's versatile power handling allows it to be configured with different speaker types, ensuring that users can achieve their desired sound profile.

The A1800 employs JL Audio's advanced Class D technology, which contributes to its compact size and lightweight design. This makes installation easier and provides flexibility when it comes to mounting the amplifier in tight spaces. Despite its small footprint, the A1800 does not compromise on performance, offering high dynamic range and minimal distortion, even at high volume levels.

Another notable characteristic of the A1800 is its sophisticated onboard signal processing capabilities. It features a variable low-pass filter, allowing users to fine-tune the crossover frequency according to their specific audio setup. Additionally, the amplifier includes both bass boost and phase control options, enabling users to tailor the sound to their preferences and achieve the best possible integration with their vehicle's audio system.

The A1800 also prioritizes durability and reliability. Built with premium components, it features a robust thermal management system designed to keep the amplifier running cool, even during extended use. This reliability is further enhanced by JL Audio's patented Smart Protect technology, which continuously monitors the amplifier's performance to prevent overheating and distortion.

In terms of aesthetics, the A1800 boasts a sleek and modern design with clean lines and a professional finish. This makes it not only a functional component of a car audio system but also an attractive addition to any vehicle's interior.

Overall, the JL Audio A1800 stands out as an excellent choice for anyone seeking to elevate their car audio experience. Its combination of powerful output, advanced technology, and user-friendly features make it a top contender in the competitive amplifier market. Whether for casual listening or high-performance audio setups, the A1800 delivers quality sound that is sure to impress.