Toa APH-20 Nstallation And Operating Instructions
Model APH-20
20 Watt Amplified Horn
Loudspeaker
Installation and
Operating Instructions
APH-20
In association with
MADE IN TAIWAN
www.toa.eu
APH-20 Manual:Layout 1 28/01/2014 15:27 Page 1
SAFETY PRECAUTIONS
• Use only a power supply with the specified output voltage and
current, as exceeding the specified limits could result in fire or other
failures.
• Install the unit only in a location that can structurally support the
weight of the unit and the mounting bracket. Doing otherwise may
result in the unit falling down and causing personal injury and/or
property damage. Be sure to mount the bracket securely, using
appropriate fixings.
• Avoid mounting the unit in locations exposed to constant vibration.
The mounting bracket could be damaged by excessive vibration,
potentially causing the speaker to fall, which could result in personal
injury.
• Do not operate the unit for an extended period of time with the
sound distorting. This is an indication of an overloaded amplifier,
which in turn could cause heat to generate and result in failure of
the unit, or possibly even a fire.
SYSTEM OVERVIEW
This amplified horn loudspeaker is designed and manufactured for
heavy-duty industrial use. It is made from ABS resin, and is supplied
complete with aluminum, universal “U” bracket, which allows for
both horizontal and vertical angular adjustment.
The input is transformer balanced, which eliminates Ground-loop
hum while also providing isolation of at least 500V DC. It has a
built-in 20 Watt power amplifier, which utilises the latest Class “D”
technology.
The unit’s master gain may be set to 12, 18, 24 or 36db by means of
an internal switch. There is also an internal volume control for
on-site adjustment. This is factory pre-set for the purpose of initial
uniformity.
The audio input is factory set to “Balanced”, although unbalanced
signals may be used, and an internal selector jumper is provided to
allow for either. In “Balanced” mode, the audio input of the unit is
transformer isolated. This prevents “Ground-loop hum” and also
provides isolation from the cable of up to 500 Volts DC.
The unit has switchable gains of 12,18, 24 and 36db and is suitable for signal level 1V p-p@1K (for Maximum Amplifier output)
The loudspeaker’s frequency response, dynamic range and
dispersion pattern are optimised for the transmission of human
speech.
The unit is weatherproof to IP65 rating. If the unit is disassembled
during installation or servicing, care must be taken to ensure that
glands and gaskets are correctly refitted.
The unit is supplied with a 2 metre flying lead. This is a shielded,
2 - pair type cable. During final termination, do ensure that the
wiring connections are protected from the ingress of moisture.
If the wire terminations are not adequately protected, premature
failure of this unit, or other associated equipment is almost certain.
This unit will operate with a regulated supply Voltage of 12 Volts
DC/2A.
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