MY Amplifier Turns ON, but There is no Output

APPENDIX D: TROUBLE SHOOTING

“MY AMPLIFIER DOESN’T TURN ON”

Check to make sure there is +12V at the “Remote” connection of the amplifier. In some cases, the turn-on lead from the source unit is insufficient to turn on multiple devices and the use of a relay is required. To test for this problem, jump the “+12V” wire to the “Remote” terminal to see if the amplifier turns on. If this does not work, proceed to the next step.

Check the fuse, not just visually, but with a continuity meter. It is possible for a fuse to have poor internal connections that cannot be found by visual inspection. It is best to take the fuse out of the holder for testing. If no problem is found with the fuse, inspect the fuse-holder.

“I GET A DISTORTED / ATTENUATED SOUND COMING OUT OF THE SPEAKER(S)”

Check the speaker wires for a possible short, either between the positive and negative leads or between either speaker lead and the vehicle’s chassis ground. If a short is present, you will experience distorted and/or attenuated output.The “Protect” light may also illuminate in this situation. It may be helpful to disconnect the speaker wires from the amplifier and use a different set of wires connected to a test speaker.

Check the nominal load impedance to verify that each channel of the amplifier is driving a load equal to or greater than 2Ω (4Ω bridged).

Check the input signal and input signal cables to make sure signal is present at the “Amplifier Inputs” and the cables are not pinched or loose. It may be helpful to try a different set of cables and/or a different signal source to be sure.

“MY AMPLIFIER SHUTS OFF ONCE IN A WHILE, USUALLY AT HIGHER VOLUMES”

Check your voltage source and grounding point.The power supply of the e6450 will operate with charging system voltages down to 8V. Shutdown problems at higher volume levels can occur when the charging system voltage drops below 8V.These dips can be of very short duration making them extremely difficult to detect with a common DC voltmeter.To ensure proper voltage, inspect all wiring and termination points. It may also be necessary to upgrade the ground wire connecting the battery to the vehicle’s chassis and the power wire connecting the alternator to the battery. Many vehicles employ small

(10 AWG - 6 AWG) wire to ground the battery to the vehicle’s chassis and to connect the alternator to the battery.To prevent voltage drops, these wires should be upgraded to 4 AWG when installing amplifier systems with main fuse ratings above 60A. Grounding problems are the leading cause of mis-diagnosed amplifier failures.

“MY AMPLIFIER TURNS ON, BUT THERE IS NO OUTPUT”

Check the input signal using an AC voltmeter to measure the voltage from the source unit while an appropriate test tone is played through the source unit (disconnect the input cables from the amplifier prior to this test).The frequency used should be in the range that is to be amplified by the amplifier

(example: 50 Hz for a sub bass application or 1 kHz for a full range / high-pass application). A steady, sufficient voltage (between 0.2 and 8.0-volts) should be present at the output of the signal cables.

Check the output of the amplifier. Using the procedure explained in the previous check item (after plugging the input cables back into the amplifier) test for output at the speaker outputs of the amplifier. Unless you enjoy test tones at high levels, it is a good idea to remove the speaker wires from the amplifier while doing this. Turn the volume up approximately half way.

5V or more should be measured at the speaker outputs. This output level can vary greatly between amplifiers but it should not be in the millivolt range with the source unit at half volume. If you are reading sufficient voltage, check your speaker connections as explained below.

Check to ensure that the speaker wires are making a good connection with the metal inside the terminal block. The speaker wire connectors are designed to accept up to 12 AWG wire. Make sure to strip the wire to allow for a sufficient connection with the metal inside the terminal block.

“MY AMPLIFIER’S OUTPUT FLUCTUATES WHEN I TAP ON IT OR HIT A BUMP”

Check the connections to the amplifier. Make sure that the insulation for all wires has been stripped back far enough to allow a good contact area inside the terminal block.

Check the input connectors to ensure that they all are making good contact with the input jacks on the amplifier.

“HOW DO I PROPERLY SET THE INPUT SENSITIVITY ON MY AMPLIFIER”

Please refer to Appendix A (page 12) to set the input sensitivity for maximum, low-distortion output.

JL AUDIO e6450

E6450 specifications

The JL Audio E6450 is a versatile amplifier designed for car audio enthusiasts seeking high performance and reliability. This 4-channel amplifier is part of JL Audio's E-Series, which is known for its exceptional sound quality and robust construction, making it suitable for a wide range of audio systems.

One of the standout features of the E6450 is its compact size, allowing for easy installation in various vehicle types. Despite its small footprint, this amplifier delivers impressive power output. It can provide up to 75 watts per channel into a 4-ohm load, enabling it to drive a range of speakers effectively. Moreover, it can bridge its channels to produce 150 watts at 4 ohms, allowing for a flexible setup that can accommodate both front and rear speakers or drive a subwoofer.

The E6450 employs advanced technologies to optimize audio performance. Its sophisticated input circuitry ensures compatibility with various audio sources, including factory and aftermarket head units. The amplifier is equipped with differential-balanced inputs that help eliminate noise and interference, ensuring a clean and clear audio signal.

Another noteworthy aspect of the E6450 is its built-in crossover network. The fully adjustable high-pass and low-pass filters allow users to tailor the frequency response according to their specific audio needs, ensuring seamless integration with other components in the sound system. This feature is particularly useful for users who wish to pair the amplifier with subwoofers or other speakers that require distinct frequency ranges for optimal performance.

JL Audio has also incorporated thermal management into the E6450 to ensure longevity and reliability during operation. Its temperature-sensitive protection circuitry prevents overheating, allowing the amplifier to perform under varying load conditions without risking damage.

In terms of build quality, the E6450 is constructed with high-quality materials that are designed to withstand the rigors of vehicle use. Its robust casing provides effective protection against the elements, while the stylish design fits well with modern car interiors.

Overall, the JL Audio E6450 stands out as a reliable and high-performing amplifier suitable for both novice and experienced car audio enthusiasts. Its combination of power, advanced technology, flexible installation options, and rugged construction make it a compelling choice for enhancing your vehicle's audio system.