Datasheet

Built-In Amplifier
As the name suggests, all self-amplified speakers contain their
own built-in, miniature amplifier. These amplifiers range in size
from 1 watt, which are used on cone speakers, up to 30 watts,
which are used on the SAH30 horn speakers.
Bogen’s latest line of self-amplified horns use a revolutionary digital
switching amplifier. Unlike conventional analog amplifiers, this
advanced technology produces very little heat when it operates.
It produces so little heat that all it needs to dissipate the waste
heat are the copper interconnecting traces on the printed circuit
board instead of the typical large aluminum heat sinks. Because
it produces so little heat, it also draws considerably less power
from the power supply. Why? Because it is not wasting half of the
power supply energy it consumes as heat.
More typical in the industry are speakers that employ analog
amplifiers, which produce considerable waste heat while oper-
ating. They typically release half the 24V power they consume
in the form of heat, and heat is a major contributor to the fail-
ure of an amplifier.
CEILING SPEAKERS
Self-Amplified
To determine the number of ceiling speakers
your installation requires, simply divide the
area’s total square footage by the speaker
coverage as indicated in this chart.
HORN LOUDSPEAKERS
Self-Amplified
To determine the number of horn loudspeakers
your installation requires, simply divide the
area’s total square footage by the speaker
coverage for the noise level in the area as
indicated in the chart below.
WALL BAFFLE SPEAKERS
Self-Amplified
To determine the number of wall baffle
speakers your installation requires, simply
divide the area’s total square footage by
600 square feet.
# of
Speakers
600
Sq. ft.
Total Area
(Sq. ft.)
÷
=
# of
Speakers
Speaker
Coverage
Total Area
(Sq. ft.)
÷
=
# of
Speakers
Speaker
Coverage
Total Area
(Sq. ft.)
÷
=
Figuring out how many speakers you need for your application is simple.
• For Bogen’s Ceiling and Wall Baffle Speakers, you will need room dimensions.
• For Bogen’s Horn Speakers, you will need room dimensions and ambient noise levels.
1
Determining
Quantities
2
Determining
Power Supply Capacity
To determine total 24V DC Power Supply size
requirement, follow the steps below.
1. Add all the numbers of the Self-Amplified speakers for the system
and volume controls together.
2. Select a Power Supply (or power supplies) with a number(s) equal to
or greater than the total amount for the system.
See pages 22 and 68 for more information.
See page 30 for
Power Supply
Selection.
See page 75 for
Maximum
Wire Lengths.
www.bogen.com
69
SYSTEM DESIGN GUIDE
WHAT MAKES A SELF-AMPLIFIED SPEAKER?
DESIGNING SELF-AMPLIFIED SYSTEMS
The amplifiers in Bogen’s AH series of self-amplified horns are
analog but rid themselves of waste heat through their large cast
aluminum end bell that works as an excellent heat sink, quickly
and effectively removing excess heat. Competitive products using
plastic end bells don’t have this cooling advantage
.
4 Wires
All self-amplified speakers require 4 wires to make the neces-
sary connections. Two of the connections are used to provide 24V
DC power to the built-in amplifier. The other connection pair to a
self-amplified speaker is for the audio signal input.
The general audio signal level is the same as what you would find
on any analog telephone line. The input is transformer balanced,
also similar to the inputs found on telephone systems. The bal-
anced nature of the input greatly reduces interference and noise
caused by equipment running in the facility. The use of an actual
transformer provides electrical isolation between the input leads
and the actual amplifier, which protects it from ground loops and
RF interference, and provides an all-around rugged input.
Coverage is 600 sq. ft. per speaker