Setting Up Your ACT-18 Subwoofer

The B-52 Pro Audio speakers described in this instruction manual are intended for portable used in which the speakers will be placed directly on the floor, stage or a solid platform. The ACT-18 and ACT-18S described in this manual should not be suspended or flown. These models are also not intended for fixed installations outdoors or in high-moisture areas. Moisture can damage the subwoofer and can cause corrosion of electrical contacts.

Keep speakers out of extended or intense direct sunlight. The subwoofer spider and surround will premature- ly dry out and finished surfaces may fade and be damaged by long-term exposure to intense ultra-violet light. B-52 Pro-Audio speakers, especially the ACT-18, can produce high-levels of energy. When placed on slippery surfaces such as polished wood or smooth tiles, the speaker may move because of its intense bass output. Precautions should be taken to ensure the subwoofer does not fall off a stage or raised surface .

The ACT-18 models include a pole-mounting cup to allow mounting of a full-range speaker above the sub- woofer. When installing a pole to mount a full-range speaker above the ACT-18, be sure to observe the follow precautions:

υCheck the pole’s specifications to be certain that it is designed to support the weight on the speaker. Observe all safety precautions specified by the stand’s/pole’s manufacturer.

υMake sure the pole is placed completely within the receptacle cup both on the subwoofer and the full-range speaker.

υRoute cables so that performers, production crews and audiences will not trip over them and pull the speaker over.

υDo not attempt to place more than one speaker on a pole designed for a single speaker.

υDo not mount a speaker above the subwoofer in windy conditions.

υB-52 Pro-Audio recommends that you not lift the speaker above the subwoofer alone.

Hearing damage, prolonged exposure to excessive SPL

B-52 Pro-Audio speakers, especially the ACT-18(S) are capable of producing sound pressure levels (SPL) suf- ficient to cause permanent hearing damage to performers, production crews or people in the audience. Hearing-protection devices (ear-plugs) are recommended. Caution should be taken to avoid extended expo- sure to SPL in excess of 90 dBA.

Amplifier Module Precautions

Do not attempt to service the ACT-18 by yourself. Refer all servicing to a B-52 Pro-Audio Authorized dealer. Service is required when the ACT-18 has had liquid spilled on or inside the subwoofer, objects have fallen onto the speaker or it has been damaged in any way, the speaker has been exposed to rain or moisture, does not operate normally or has been dropped.

Keep your ACT-18 amplifier away from sources of heat such as a radiator or intense sunlight. Do not cover your ACT-18 amplifier with material that may retain heat, such as a blanket or curtain. Be certain that the vents on the panel of the amplifier are clear of all obstructions during operation.

WARNING – Shock Hazard:

To reduce the risk of fire or electrical shock, do not expose this unit to rain or moisture. Do not operate your ACT-18(S) near a pool or other standing water. Do not bypass or defeat the grounding or polarization means used on the ACT-18 amplifier. Make sure all blades on the polarized power plug are fully inserted into the power source. Ensure the power cord is not stretched, pinched or otherwise abused. Ensure the power cord is rout- ed to avoid foot traffic. Your ACT-18 amplifier should be cleaned only with a dry cloth.

ACT18 specifications

ETI Sound Systems, Inc. has made a significant mark in the professional audio equipment industry, particularly with their flagship product, the ACT18. This state-of-the-art loudspeaker system is designed to cater to a variety of live sound applications, ensuring that audio professionals have access to a powerful and reliable sound solution.

The ACT18 is characterized by its impressive low-frequency response and high output capabilities. It features an 18-inch high-efficiency woofer that delivers deep, punchy bass, making it ideal for applications such as concerts, festivals, and other live events. The woofer is engineered with a robust magnetic circuit and a large voice coil, which contribute to its ability to handle high power levels while maintaining clarity and precision.

One of the key technologies integrated into the ACT18 is the advanced digital signal processing (DSP) module. This feature enables users to fine-tune the audio output according to the specific requirements of the venue and type of performance. With customizable EQ settings, delay options, and crossover configurations, the DSP ensures optimal sound reproduction and maximizes the performance of the loudspeaker in any environment.

In addition to its acoustic capabilities, the ACT18 is designed with durability in mind. The enclosure is constructed from high-quality plywood, coated with a rugged finish to withstand the rigors of touring and frequent transport. The loudspeaker is also equipped with reinforced corners and handles, making it easier for audio professionals to maneuver and set up quickly.

Further enhancing its versatility, the ACT18 can be used in various configurations. It can be deployed as a standalone unit, paired with other loudspeakers, or integrated into a larger sound system. This flexibility makes it suitable for both small venues and large-scale events.

Safety features are also a priority in the ACT18 design. The loudspeaker includes thermal protection circuitry to prevent overheating during prolonged use, ensuring reliability and longevity. Additionally, the connectors are designed for secure integration with other audio equipment, reducing the risk of accidental disconnections.

In summary, the ETI Sound Systems, Inc. ACT18 stands out as a powerful, reliable, and versatile loudspeaker system. Its advanced features, including high-efficiency technology, digital signal processing, and robust construction, make it an excellent choice for audio professionals looking for quality sound in demanding environments. Whether for live performances, installations, or event production, the ACT18 continues to deliver outstanding audio performance, setting a new standard in the pro audio market.