JL Audio 300/2 owner manual Crossover Controls Preamp Output Section Speaker Outputs

Page 5

CROSSOVER CONTROLS

 

PREAMP OUTPUT SECTION

SPEAKER OUTPUTS

Crossovers are groups of individual electronic filters

2) “Filter Slope” Control: This switch allows

The 300/2 incorporates a flexible preamp output

 

The 300/2 employs JL AUDIO's exclusive

which allow only certain frequency ranges to pass

you to select from two filter slopes for that

section, so that additional amplifiers can be added to

Regulated, Intelligent Power Supply (R.I.P.S.) design.

through them by attenuating frequencies outside

channel section.

the system.This pre-amp output can be configured

This sophisticated power supply allows the

the selected range.These filters allow the user to

“12dB”: Configures the filter to attenuate

three different ways using the switch labeled

amplifier to produce its optimum power (300

specify what frequency range will be sent to the

frequencies above or below the selected filter

“Output Mode” in the “Preamp Output Section”.

watts) over a wide range of speaker impedances.

each amplifier (or channels) in a system.This, in turn,

frequency at a rate of 12 dB per octave

 

 

 

 

 

 

 

 

Unlike conventional amplifiers that require a

 

 

 

 

 

 

 

 

allows each speaker system to only reproduce a

(Butterworth alignment).

 

 

 

 

 

 

 

 

specific impedance to produce optimum power,

range of frequencies it is well-suited for, resulting in

“24dB”: Configures the filter to attenuate

 

 

 

 

 

 

 

 

the R.I.P.S.-equipped 300/2 gives you the freedom

 

 

 

 

 

 

 

 

reduced distortion and improved fidelity.

frequencies above or below the selected filter

 

 

 

 

 

 

 

 

to use a variety of speaker configurations that

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

frequency at a rate of 24 dB per octave (Linkwitz-

 

 

 

 

 

 

 

 

achieve final impedances between 1.5 – 4Ω

Amp Filter Section:

Riley alignment).

 

 

 

 

 

 

 

 

nominal per channel (without sacrificing power

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Depending on the speaker system and the

 

 

 

 

 

 

 

 

output or sound quality).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

vehicle, different filter slopes may be required to

 

 

 

 

 

 

 

 

 

The operation of the R.I.P.S. circuitry is entirely

 

 

 

 

 

 

 

 

 

 

 

 

 

 

produce a smooth transition between the sound of

 

 

 

 

 

 

 

 

automatic and adjusts itself every time the amplifier

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1) “Full-Range”: The preamp output delivers

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

different speakers in the system. Experiment to find

is turned on according to the lowest impedance

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

the slope which best matches the acoustic

the same signal that is connected to the 300/2's

present at the speaker outputs .There are no user

 

 

 

 

 

 

 

 

 

 

 

 

 

 

requirements of the system.The sharper “24dB”

Amplifier Inputs.

controls to configure.The system operates through

 

 

 

 

 

 

 

 

 

 

 

 

 

 

setting will do a better job of protecting small

2) “Low-Pass”: The preamp output delivers

multiple stages of impedance optimization, choosing

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

speakers with limited power handling.The shallower

the same signal that is connected to the 300/2's

the stage most appropriate to the actual impedance

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

“12dB” octave setting allows the rear speakers to

Amplifier Inputs with Low-Pass filtering applied to

of the speakers you connect to it.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

reproduce more low-frequency content.

it at the “Filter Freq.” and “Filter Slope” selected

 

 

 

 

 

 

 

 

 

 

 

 

 

1) “Filter Mode” Control: This switch allows you to

3) “Freq. Range” Control: When thrown to

in the “Amplifier Filter” section. This mode can

 

 

 

 

 

 

 

 

 

 

 

 

 

configure the filter into one of two filter types or

the right, this switch multiplies the cutoff

be useful for feeding a subwoofer amplifier

 

 

 

 

 

 

 

 

 

 

 

 

 

defeat it completely:

frequency selected by the rotary “Filter Freq.

when the 300/2 is being used to drive the

 

 

 

 

 

 

 

 

 

 

 

 

 

“Off”: Defeats the filter for that channel section

(Hz)” control by a factor of 10. In the “x1”

main speaker system.

 

 

 

 

 

 

 

 

 

 

 

 

 

completely, allowing the full range of frequencies

position, the range of the rotary control is

3) “High-Pass”: The preamp output delivers

 

 

 

 

 

 

 

 

 

 

 

 

 

present at the inputs to feed the amplifier.This is

50 - 500 Hz (as marked). In the “x10”

the same signal that is connected to the 300/2's

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

useful for systems utilizing outboard crossovers or

position, the range of the rotary control is

Amplifier Inputs with High-Pass filtering applied to

 

 

 

 

 

 

 

 

 

 

 

 

 

requiring full-range reproduction from the 300/2.

500 Hz - 5 kHz (5000 Hz).

it at the “Filter Freq.” and “Filter Slope” selected

 

 

 

 

 

 

 

 

 

 

 

 

 

“LP” (Low-Pass): Configures the filter to attenuate

4) “Filter Freq. (Hz)” The filter frequency

in the “Amplifier Filter” section. This mode can

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

frequencies above the selected filter frequency.

markings surrounding this rotary control are for

be useful for feeding a second satellite amplifier

 

 

 

 

 

 

 

 

 

 

 

 

 

Useful for connection of subwoofer(s) to the 300/2.

reference purposes and are generally accurate to

when the 300/2 is being used to drive the main

 

!

IMPORTANT

 

 

 

 

 

 

 

If you connect a load higher than 4Ω nominal

“HP” (High-Pass): Configures the filter to attenuate

within 1/3 octave or better. If you would like to

speaker system.

 

 

frequencies below the selected filter frequency.

select the filter cutoff frequency with a higher level

 

 

 

 

 

 

 

 

per channel in stereo mode (or 8Ω in bridged

Useful for connection of component speakers to

of precision, consult the chart in Appendix A

NOTE: The signal level of the “Preamp Output” is

mode), power will drop by half with every

the 300/2 in a bi-amplified system.

(page 12) of this manual.

affected by the setting of the “Input Voltage Range”

doubling of impedance above 4Ω stereo / 8Ω

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

switch of the amplifier. See the “Input Voltage

mono. If you connect a load lower than 1.5Ω

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Range” section (page 7) for details on “Input

nominal per channel in stereo mode (or 3Ω in

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Voltage” settings.The preamp output level is not

bridged mode, the amplifier protection circuitry

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

affected by the “Input Sens.” rotary control.

activates a “safe” mode which reduces amplifier

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

power to protect the circuitry from failure (the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

yellow “Low Ω” LED lights to indicate that this

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

has happened). See page 10 for details.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

!

IMPORTANT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Speaker loads below 1.5Ω nominal per channel

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

in stereo or 3Ω nominal in bridged mode are not

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

recommended and may cause the amplifier output

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

to distort excessively.

8

JL AUDIO 300/2

JL AUDIO 300/2

9

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Contents N e r ’ s m a n u a l Planningyour Installation Installation ApplicationsProtectyour Hearing Serial NumberPower Connections Typical Installation SequenceProduct Description AmplifierFuse Requirements TURN-ON Lead Input Section Crossover Controls Preamp Output Section Speaker Outputs Servicingyour JL Audio Amplifier Status Indicator Lights Protection CircuitryBridging Considerations Full-clockwise Appendix aAppendix B P O RTA N T8Ω bridged Appendix C Trouble Shooting MY Amplifier DOESN’T Turn onMY Amplifier Turns ON, but There is no Output HOW do I Properly SET the Input Sensitivity on MY AmplifierAppendix D 300/2 SpecificationsInstallation Notes If you need service on your JL Audio product Limited Warranty Amplifiers USAFor Service Information in the U.S.A. please call JL Audio, Inc

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.
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