JL Audio J2500.1 owner manual PREAmP Outputs, Remote Level Control, Bass BOost Control

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“PREAmP OUTPUTS”

The J2-500.1 incorporates a preamp output section, designed to make multiple amplifier systems easy to set up. This section consists of a pair of RCA-type jacks marked

“Preamp Outputs”.

Preamp

Outputs

LEFT

REMOTE LEVEL Control

The J2-500.1 includes a remote level control that can be mounted in the front of the vehicle. This control allows the owner to adjust the overall subwoofer level to taste. To connect the remote bass control knob, insert its plug into the jack labeled “Remote Level Port” on the amplifier and route the cable and control to the desired location in the front of the vehicle.

SPEAKER OUTPUT

Speaker connection to the J2-500.1 is straightforward and takes place at the far right of the power/speaker connection panel. A single positive (“+”) connection and a single negative (“”) connection are available via a connector labeled “Speaker Output (Mono)”.

“POWER” INDICATOR LED / Protection Circuitry

The multi-color “Power” LED on the J2-500.1also serves as a status indicator for certain fault conditions. Its operation is as follows:

1)Red: Amplifer is turning on.

2)Green: Amplifier is on / operating normally.

3)Yellow: Protection mode activated due to one

of the following: Shorted outputs, too low of a load impedance or thermal overload (too hot).

RIGHT

Remote

Level

Port

OP

40

130

Off +12dB

LP Filter Frequency (Hz)

Bass Boost

Once the fault condition is corrected, the amplifier will return to normal operating mode and the LED will turn green again. For information on troubleshooting this amplifier, refer to Appendix C (pages 12, 13).

The Preamp outputs deliver the same signal that is being fed to the inputs. (If the input signal are full-range, the preamp outputs will be full-range).This signal is not affected by the bass boost or LP FIlter processing selected for the amplifier.

“BASS BOost” Control

The J2-500.1 includes a single band, boost- only bass equalizer controlled by a rotary knob marked “Bass Boost”. This control has a boost range of 0dB (full-counterclockwise) to +12dB (full-clockwise) and is centered at 45 Hz.

Care should be taken to securely mount this control in a manner that does not interfere with vehicle operation.

When setting the amplifier’s input sensitivity, the Remote Level Control should be unplugged or at full clockwise rotation (maximum level).

Speaker loads below 2Ω nominal are not recommended and will cause the amplifier to enter into a protection mode.

Do not chassis ground any speakers connected to this or any other JL Audio amplifier. Doing so will cause the amplifier to go into protection.

To connect the speaker wires to the amplifier, strip 1/2-inch (12 mm) of insulation from each speaker wire and insert them into their appropriate connector (observing correct polarity). Then, tighten each connector using a Phillips screwdriver.

Power

Servicing your JL Audio Amplifier

If your amplifier fails or malfunctions, please return it to your authorized JL Audio dealer so that it may be sent in to JL Audio for service. There are no user serviceable parts or fuses inside the amplifier. The unique nature of the circuitry in the JL Audio amplifiers requires specifically trained service personnel. Do not attempt

Off +12dB Bass Boost

Do NOT attempt to “bridge” two J2-500.1’s together or combine their output to a single load in any manner. Doing so will damage the amplifier(s).

Before reconnecting the battery ground and turning the system on, verify that all control settings on the amplifier are set according to the needs of the system.

to service the amplifier yourself or through unauthorized repair facilities. This will not only void the warranty, but may result in the creation of more problems within the amplifier.

If you have any questions about the installation or setup of the amplifier not covered in this manual, please contact your dealer or technical support.

JL Audio Technical Support:

(954) 443-1100

9:00 AM – 5:30 PM (Eastern Time Zone)

Monday - Friday

8

JL Audio®

9

J2_500_1_MAN_CH.indd 8-9

4/22/09 11:24:45 AM

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Contents 500W Monoblock Subwoofer Amplifier Cooling Efficiency Considerations Safety ConsiderationsSerial Number Stupid Mistakes to AvoidFuse Requirements Power ConnectionsProduct Description Amplifier InputS REMote turn-OnLP Filter CroSSOVER Control Output Polarity ControlRemote Level Control PREAmP OutputsBass BOost Control Servicing your JL Audio AmplifierAppendix b J2-500.1 Specifications General Specifications Nine-Step ProcedureDimensions LxWxH Appendix aMy amplifier turns on, but there is no output My amplifier doesn’t turn onINSTALLATION NOTES If you need service on your JL Audio product Limited Warranty Amplifiers USAJL Audio, Inc International Warranties

J2500.1 specifications

The JL Audio J2500.1 is a powerful monoblock amplifier primarily designed for serious music enthusiasts and audiophiles who demand high-quality sound reproduction in their car audio systems. With a robust output of 2500 watts RMS at 1 ohm, this amplifier is engineered to deliver deep, thunderous bass without sacrificing clarity or detail.

One of the standout features of the J2500.1 is its patented NexD technology, which allows for efficient and precise power delivery. This technology optimizes the amplifier's performance, minimizing distortion and maximizing sound fidelity. The amp's efficient Class D design not only contributes to lower power consumption but also helps in keeping the unit relatively cool during prolonged use, avoiding overheating issues that can plague less efficient amplifiers.

The amplifier is equipped with advanced thermal management features, including internal temperature sensing and a built-in fan for additional cooling when required. This ensures that the J2500.1 can perform optimally, even under the most demanding conditions.

Another significant characteristic of the JL Audio J2500.1 is its adjustable low-pass filter, which allows users to tailor the frequency response to suit their specific audio needs. The filter can be set between 30 Hz and 200 Hz, enabling seamless integration with subwoofers and other components in a car audio setup. Additionally, it features both a variable bass boost and a subsonic filter, offering further control over the audio output to enhance the listening experience.

The amplifier's construction boasts durability and sophistication, featuring a rigid chassis and high-quality components designed to withstand vibration and harsh automotive environments. Its sleek aesthetic, combined with practical terminal placement, makes installation straightforward, catering to both professional installers and passionate DIY enthusiasts.

In essence, the JL Audio J2500.1 is engineered for those seeking uncompromising performance and scalability in their sound systems. With its powerful output, advanced technologies, and user-friendly features, it stands out as a premier choice for delivering exceptional audio quality, especially for bass enthusiasts looking to elevate their in-car music experience. Whether used in a dedicated subwoofer setup or as a part of a more complex audio system, the J2500.1 will undoubtedly impress even the most discerning listeners.