Airmar Acoustic Deterrent System—dB Plus II™ - Manual (Page 3)

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AIRMAR Technology Corporation
To our customers:
Thank you for purchasing Airmar Technology Corporation’s dB PLUS II

Acoustic Deterrent System.
Since its founding in 1981, Airmar has been a leader in product innovation and technical excellence. Our
position as a world-class manufacturer is evidenced by the many U.S. and foreign patents we hold.
You have chosen a product with a proven performance record of reliability and quality, and we are
confident you will be satisfied with it. This manual provides important information regarding its operation
and maintenance. To achieve optimal performance, it is important that you familiarize yourself with its
content.
Installation of your dB PLUS II

system should be performed by a factory authorized technician who will
determine the best layout of equipment based on a site assessment. The proper placement of the sound
projectors is necessary to ensure maximum protection from predators.
A reliable power source is of crucial importance to the effectiveness of the product, especially when it must
be installed away from shore power. Care should be taken to ensure proper installation and maintenance
of your power supply in accordance with the manufacturer’s instructions.
Airmar has made product safety a priority in the design of the dB PLUS II

system. Proper operation,
using the safety features, should ensure the protection of both humans and marine mammals.
Airmar Technology Corporation backs the dB PLUS II

equipment with a one year warranty against
defects in workmanship. However, we cannot guarantee that the system will completely eliminate attacks,
such as those from hearing impaired seals. Hearing loss, occurring in a small portion of marine mammals,
can be attributed to interactions with fisheries using “seal bombs” and parasites known to effect the hearing
of older marine mammals. Airmar recommends using the
dB PLUS II

system in conjunction with other
predator control methods.
Welcome to the Airmar family of satisfied customers!
dB Plus II 
System Overview
The dB PLUS II

Acoustic Deterrent System provides up to 3,000 square meters of protection. Four
projectors
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, operating from one, four circuit, DC powered transmitter, provide high intensity acoustic pulses
that cause significant discomfort to seals in the guarded area. However, these pulses have no known effect
on fish since the system’s frequency of operation is well above their hearing range.
The rugged dB PLUS II

equipment is designed to withstand the harsh conditions of the marine
environment. This feature-rich system includes low-power warning alarms as well as an array of safety
enhancements.
To protect both divers and marine mammals, it is equipped with a unique Soft-start

feature which allows
time to clear the area before reaching full sound output. As further protection for divers, the transmitter
power switch is designed to be locked in the “OFF” position to prevent accidental activation, and the high-
visibility cover can be drawn over the transmitter box to signify a diver’s presence in the water.
Development of the dB PLUS II

Acoustic Deterrent System has involved extensive field tests conducted
over an extended period of time. It is the most advanced system available today.
1.Projector and transducer are synonymous terms in this document.