protection circuitry

The built-in protection circuitry in the Pyramid Crystal amplifiers will disable the amplifier if it senses an input overload, a speaker short circuit, or extreme temperature conditions.

When the protection circuit is activated by any of these conditions, the Protection LED will be illuminated.

troubleshooting

No output.

Confirm that all terminal strip connections are secure and tight.

Check both in-line and built-in fuses. Both the +12V and the Remote terminals must have +12v referenced to chassis ground.

Confirm that the audio signal source (car radio, equalizer, etc.) is connected and is supplying output signal. To check if the amp is supplying signal, unplug the cables from the signal source (but leave them plugged into the amp). Briefly tap the center pin of each of the disconnected RCA plugs with your finger. This should produce a noise (feedback) in your speakers.

If this occurs, carefully inspect the system to determine the source of the problem.

•If the shutdown was a result of a thermal overload condition, allow the amplifier to cool down before attempting to restart it.

•If the shutdown was a result of an input overload, or speaker short circuit, be sure to correct the condition before restarting.

The amplifier can be restarted by turning the remote power OFF and then ON again.

Only one channel works.

 

Confirm that all terminal strip connections are secure and tight.

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Check the Balance control on the head unit (or other source) to verify that it is set to its midpoint.

If you are using the Low Level RCA input, reverse the input plugs at the amplifier (i.e., switch the L with the R). If the channels which is silent switches to the other side, the problem is either in the head unit/other source or the connecting cables.

Weak output.

Readjust the Input Level Control(s) to better suit the input signal.

Noise in the audio.

If the noise is a “whine” whose pitch follows the engine speed, confirm that the amplifier and any other signal sources (head unit, etc.) are properly grounded.

If the noise is a “clicking” or “popping” noise whose rate follows the engine speed, this usually means that the vehicle is equipped with resistor spark plugs and wires, or that the ignition is in need of service.

Check the rounting of the speaker and input wires to make sure they are not adjacent to wires which interconnect lights and other accessories.

If the above steps fail to improve or clear noise interference, the system should be checked by a professional mobile audio installer.

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Pyramid Car Audio PB1881X, PB681X, PB881X, PB781X, PB481X, PB1281X manual Protection circuitry, Troubleshooting
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PB1881X, PB881X, PB781X, PB481X, PB1281X specifications

Pyramid Car Audio has established a solid reputation for producing high-quality audio systems that enhance the listening experience in vehicles. Their models PB681X, PB1281X, PB481X, PB781X, and PB881X are popular choices among car audio enthusiasts looking for dependable, high-performance sound systems. Each model comes with its unique features and technologies, catering to various listening preferences and vehicle requirements.

The PB681X is an entry-level offering that doesn't sacrifice quality for affordability. This 6x8-inch speaker delivers a powerful 300 watts peak power with a 4-ohm impedance, providing robust sound with impressive clarity. Its durable poly-injection cone and rubber surround ensure extended longevity while enhancing low-frequency response, making it an ideal choice for those who want better sound without breaking the bank.

For those looking for a bit more power, the PB1281X features an impressive 1000 watts peak power with an 8-inch subwoofer. This model is designed with a high-temperature voice coil that minimizes distortion, delivering crisp and clear sound even at high volumes. Its adjustable ported enclosure adds versatility, allowing users to optimize bass response based on individual tastes.

The PB481X offers a unique combination of features aimed at delivering high fidelity sound. This model integrates a 4-channel amplifier with built-in Bluetooth connectivity, allowing for seamless streaming from mobile devices. With 480 watts peak power, it uses advanced circuitry to efficiently manage power output while ensuring minimal interference and maximum sound quality.

Next in line is the PB781X, which blends power with portability. This 7-inch subwoofer packs a whopping 800 watts of peak power and features a heavy-duty magnet structure. The model is designed for easy installation in a variety of vehicle types, making it an excellent choice for anyone looking to upgrade their sound system without extensive modifications.

Lastly, the PB881X stands out as a premium model, offering advanced technologies and superior sound quality. It features an 8-inch subwoofer capable of producing 1200 watts peak power. The high-quality enclosure is optimized for bass performance, while the durable materials ensure protection against wear and tear. Features like adjustable crossover settings and remote bass control increase flexibility for users who want to customize their audio experience.

In summary, Pyramid Car Audio’s PB681X, PB1281X, PB481X, PB781X, and PB881X models present a diverse lineup suitable for different users, from casual listeners to serious audiophiles. With a focus on durability, performance, and ease of use, these products cater to anyone seeking an enhanced automotive audio experience.
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