AH-5A BOGEN COMMUNICATIONS, AH-5A Datasheet - Page 67

• Manufacturer Part Number: AH-5A
• Description: Amplified Speaker/horn
• Manufacturer: BOGEN COMMUNICATIONS

Specifications of AH-5A

• Peak Reflow Compatible (260 C): No
• Leaded Process Compatible: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

WHAT MAKES A 70V SPEAKER?
Step-Down Transformer
70V paging speakers have a step-down transformer,
which is used to convert the high-voltage/low-current
amplifier signal of the central paging amplifier to the low-
voltage/high-current signal that speakers use.
Taps
The primary side of the step-down transformer (the
side that connects to the amplifier) has a number of
connections (called taps or power taps) that can be
used to select the peak power the speaker will con-
sume from the amplifier.
Why Taps?
The selection of the power tap has an effect on both
the amplifier power needed for the system and the
volume of the speaker. The more power a speaker
consumes, the louder the sound from the speaker.
By tapping speakers for lower power in quiet areas and
for higher power in noisier areas, the sound level
of the paging system can be controlled and balanced.
It is important that speakers be tapped correctly for the
area that they will be used in. Setting all the speakers for
the same power regardless of the amount of noise in
different areas will cause balance problems. If the
amplifier is adjusted to produce adequate paging levels
70V Output
A 70V output is available on Bogen amplifiers and is the
primary type of output for paging systems. A step-up
output transformer in the amplifier provides the high
70V output signal. All speakers with step-down transform-
ers (rated for 70V systems) are connected to this output.
Other Output Types
(25V, 16- and 8-ohm)
There are a number of other standard speaker imped-
ances that Bogen amplifiers can be connected to.
These outputs provide the correct speaker signal level
for different configurations of low-impedance speakers.
The lower voltage, 25V, output is provided on many
Bogen amplifiers for use in paging installations that
require a speaker voltage of less than 70V to meet
building code requirements.
AMPLIFIER OUTPUT TYPES
in the noisy areas, the paging levels in the quiet areas
will be too loud or vice versa. Selecting the proper tap set-
ting is not difficult, but it does require knowing the level of
ambient noise in different areas. (See Sound Pressure Levels
Chart on page 77.) It is always better to use the next higher
wattage tap if there is any doubt about the speaker being
sufficiently loud for the area.
Of course, the best way to determine how effectively a
system covers an area is to test it. Never install a paging
system and leave the site without testing it. Sound adjust-
ments or additional speakers may be needed. Some
paging equipment, such as Bogen’s PCM2000, UTI1,
and UTI312 paging interfaces include a test tone that is sent
to all speakers in the system so installers can check the
system installation. For other systems, the installer
can have pages made while the installer walks the area
to listen for appropriate sound levels and uniform coverage of
the system to find out if and where adjustments need
to be made, and to make sure that all speakers are
properly connected.
Easy Design
To make designing paging systems as easy as possible,
Bogen offers a line of Easy Design
speakers do not require tapping and allow for on-the-fly
adjustment of speaker paging levels. All the information that
is needed to design a complete system are the
dimensions of the different paging areas and the type of
environment. With this basic information, you can use the
Easy Design speaker line to quickly design a robust,
professional, and powerful paging system. (See pages
15-21 for more information.)
Direct Output
Direct outputs are used with low-impedance speakers.
These outputs have an exceptional low frequency (bass)
response, providing the fuller sound that low-imped-
ance speakers can reproduce. Certain Bogen amplifiers,
designed for general purpose sound reinforcement
applications, include this feature which allows the step-up
output transformer to be bypassed for direct connection
to the power amplifier’s output.
™
Without Taps
™
speakers. These
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