Manuals / JL Audio / Car Audio and Video / Car Stereo System

JL Audio 300/2 owner manual Appendix a, Full-clockwise, Appendix B, P O Rta N T

Models: 300/2

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APPENDIX A:

Precise Frequency Selection Chart

“FILTER FREQ” AMP FILTER

Detent Panel Actual

Number Marking Freq.

Full counter-clockwise: 58

01 . . . . . . . . . . . . . . . . . . . . . . . .58 02 . . . . . . . . .“50” . . . . . . . . .58 03 . . . . . . . . . . . . . . . . . . . . . . . .58 04 . . . . . . . . . . . . . . . . . . . . . . . .58 05 . . . . . . . . . . . . . . . . . . . . . . . .59 06 . . . . . . . . . . . . . . . . . . . . . . . .60 07 . . . . . . . . . . . . . . . . . . . . . . . .61 08 . . . . . . . . .“60” . . . . . . . . .63 09 . . . . . . . . . . . . . . . . . . . . . . . .65 10 . . . . . . . . . . . . . . . . . . . . . . . .67 11 . . . . . . . . . . . . . . . . . . . . . . . .69 12 . . . . . . . . . . . . . . . . . . . . . . . .71 13 . . . . . . . . . . . . . . . . . . . . . . . .74 14 . . . . . . . . .“75” . . . . . . . . .77 15 . . . . . . . . . . . . . . . . . . . . . . . .80 16 . . . . . . . . . . . . . . . . . . . . . . . .82 17 . . . . . . . . . . . . . . . . . . . . . . . .85 18 . . . . . . . . . . . . . . . . . . . . . . . .90 19 . . . . . . . . . . . . . . . . . . . . . . . .93 20 . . . . . . . . .“95” . . . . . . . . .97 21 . . . . . . . . . . . . . . . . . . . . . . .102 22 . . . . . . . . . . . . . . . . . . . . . . .107 23 . . . . . . . . . . . . . . . . . . . . . . .113 24 . . . . . . . . . . . . . . . . . . . . . . .120 25 . . . . . . . . . . . . . . . . . . . . . . .127 26 . . . . . . . . .“130” . . . . . . . .135 27 . . . . . . . . . . . . . . . . . . . . . . .143 28 . . . . . . . . . . . . . . . . . . . . . . .153 29 . . . . . . . . . . . . . . . . . . . . . . .171 30 . . . . . . . . . . . . . . . . . . . . . . .182 31 . . . . . . . . . . . . . . . . . . . . . . .201 32 . . . . . . . . .“200” . . . . . . . .223 33 . . . . . . . . . . . . . . . . . . . . . . .253 34 . . . . . . . . . . . . . . . . . . . . . . .289 35 . . . . . . . . . . . . . . . . . . . . . . .337 36 . . . . . . . . . . . . . . . . . . . . . . .404 37 . . . . . . . . . . . . . . . . . . . . . . .474 38 . . . . . . . . .“500” . . . . . . . .514 39 . . . . . . . . . . . . . . . . . . . . . . .525

Full-clockwise: 542

APPENDIX B:

Input Sensitivity Level Setting

JL Audio amplifiers utilizing the Regulated Intelligent Power Supply (R.I.P.S.) allow delivery of their rated power when connected to any load impedance from 1.5 - 4Ω per channel (3 - 8Ω bridged) and when connected to a charging system with any voltage from 11 - 14.5V. This design is beneficial for many reasons. One of these reasons is ease of setup. Because each JL Audio amplifier will always deliver the same amount of power within its operational range of impedances and supply voltages, the maximum, unclipped output is very predictable.This makes setting the gain structure via the input sensitivity controls very simple. Following the directions below will allow the user to adjust the input sensitivity of the amplifier(s) 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 Outputs”connectors.

2)Turn off all processing on the source unit (bass/treble, loudness, EQ, etc.). Set fader control to center position and subwoofer level control to 3/4 of maximum (if used to feed the 300/2).

3)Switch the “Input Voltage” 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 below, 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 300/2) at 3/4 source unit volume.

7)Connect the AC voltmeter to the “Speaker Outputs” connectors of the amplifier. If the channel pair is operating in stereo, it is only necessary to measure one channel. If bridged, make sure you test the voltage at the correct connectors (L+ and R–).

8)Increase the “Input Sens.” control until the target voltage is observed with the voltmeter. If excessive voltage is read with the control at minimum (full counterclockwise), switch the “Input Voltage” switch to “High” and re-adjust.

9)Once you have adjusted the 300/2 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.

! I M P O RTA N T

Do not increase any “Input Sens.” setting 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.

Target AC Voltage

Impedance

Stereo

Bridged

8Ω

24.5 V

49.0 V

6Ω

24.5 V

42.4 V

4Ω

24.5 V

34.6 V

3Ω

21.2 V

30.0 V

2Ω

17.3 V

not recommended

1.5Ω

15.0 V

not recommended

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JL AUDIO 300/2

JL AUDIO 300/2

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JL Audio 300/2 owner manual Appendix a, Full-clockwise, Appendix B, P O Rta N T
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300/2 specifications

The JL Audio 300/2 is a premium two-channel amplifier that stands out in the world of automotive audio for its exceptional sound quality and robust performance. Designed with an emphasis on power and fidelity, this amplifier is ideal for enthusiasts looking to enhance their car audio systems.

One of the standout features of the JL Audio 300/2 is its impressive power output. Capable of delivering 75 watts per channel at 4 ohms and an elevated 150 watts per channel at 2 ohms, this amplifier ensures that your speakers receive the necessary power to produce clear, dynamic sound. This ample power allows for a significant improvement in overall audio performance, making even the most nuanced musical passages come alive.

The amplifier utilizes advanced Class A/B technology, which combines the efficiency of Class B with the linearity of Class A. This results in minimized distortion and improved thermal performance, allowing the JL Audio 300/2 to run cool even under demanding conditions. Such design yields a rich, warm sound, ideal for both casual listeners and serious audiophiles.

The JL Audio 300/2 is also equipped with a fully adjustable crossover system. This system features high-pass and low-pass filters, which enable users to tailor the audio output to their particular speaker configuration. The built-in frequency adjustment allows for precise tuning, optimizing the amplifier's performance in various listening environments.

Durability and design are also key characteristics of the JL Audio 300/2. The amplifier is housed in a sturdy, yet attractive metal chassis designed to withstand the rigors of automotive use. Its sleek aesthetic and compact design make installation straightforward, fitting seamlessly into a variety of automotive environments.

Moreover, the amplifier features a secure input terminal and robust speaker outputs that allow for reliable connections, reducing the chances of interference or loss of signal quality.

In summary, the JL Audio 300/2 is a high-performance two-channel amplifier that marries powerful output with advanced audio technology. Its Class A/B design, customizable crossover options, and durable construction make it a perfect choice for car audio enthusiasts seeking to elevate their listening experience. Whether powering high-quality component speakers or adding depth to an audio system, the JL Audio 300/2 is engineered to deliver impressive sound fidelity and reliability.