Toa AV-20D, Operating Instructions Manual

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3. GENERAL DESCRIPTION
The AV-20D is a 2 channel digital amplifier for speech and general announcement. This compact amplifier is
equipped switching power supply circuit inside, Energy Star 2.0 certified and PLENUM rated (UL 2043 listed) for
the installation into air handling space without external AC adaptor. The rated output power is 15W at 8 Ohms x
2 channel, 20W at 4 Ohms x 2 channel or 40W at 8 Ohms in BTL connection. The unit is suited to use in board
room, conference room and AV presentation room.
4. FEATURES
•
3 kinds of input connector (RTB, 3.5mm plug and RCA STEREO) with individual input level selector switch.
• Compliant with “Energy Star 2.0” to save the power automatically moving into minimum power consumption.
• High efficiency and low heat Class-D amplifier technology achieves fanless, no ventilation, convection cooling.
• Supplied VCA for remote volume control.
• Front operable bass and treble controls in recessed design to prevent accidental operation.
•
Removable input/output terminal blocks facilitate installation and maintenance.
•
Built-in ALC (Auto-Level Compressor) circuit to protect the connected speakers and internal
components from the over loaded input.
•
Working in AC100V-240V, 50Hz/60Hz.
• UL2043, plenum rated construction for in-the-ceiling installation using attached EMT adaptor plate
5. NOMENCLATURE AND FUNCTIONS
[Front]
This figure represents the AV-20D
1. Power on indicator
Lights green when the amplifier is powered on. If it is
blinking the unit stays power saving mode.
2. Protection indicator
Whenever this yellow indicator lights up, it implies
that the internal protections have been triggered to
protect the unit against damage. Should this
protections turn on, please check if the amplifier is
being overdriven or there is any short circuit in
speaker wires.
3. Signal level indicators (L&R channels)
Lights green when audio signals are output from the
speaker output terminals.
4. Peak indicators (L&R channels)
Lights red if output signals approach clipping level. If
steady lit, turn down the corresponding input volume
control until the indicator flashes intermittently
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