Redback Phase 4 Quick Manual

Public Address
4 x 60 Watt Power Amplifier
Congratulations on purchasing a REDBACK Phase 4 Public Address Amplifier.
Engineered and manufactured to high standards this unit will provide you with many trouble free
years of use.
F :
EATURES
4 independent 60W amplifiers
•
• LED bargraph VU meter
• Input signal presence indicator
• 2U 19" rack mount
• 3 pin XLR input
• Level control rear mounted
• Output terminals for 100V and 4 - 16Ω
• Thermal protection
• 240V AC / 24V DC operation
• Australian made
• 10 Year warranty

Audio Connections

The audio Line Input is via the 3 pin XLR socket on the rear panel. This is a 320mV line
level balanced signal which is normally fed from a mixer panel. Pin out details are shown
in diagram 1.
A balanced, Line Out XLR plug is also available for passing the audio signal on to more
amplifiers if required.

Speaker Connections

Speakers with a total impedance of 4 to 16 ohms, or speakers fitted with a line transformer
may be connected.
Always ensure that the total load of the fitted speakers does not exceed the rated output of the amplifier channel (60 Watts per
channel ONLY). Otherwise damage may result.
Always be especially careful to avoid any short circuits and connections to the wrong terminals.

Power Supply

Ensure power is switched off at the front panel of the amplifier. Connect either mains power to the IEC socket with the sup-
plied lead or 24V DC via the rear terminals.

Operation

Confirm all connections are correct. Turn all volume controls on the rear panel of amplifier down. Switch on the power at the
front panel. Slowly increase the volume on each amplifier channel to about half way. Adjust the volume output to a suitable
audio level.
The fault LED on the front panel indicates the amplifier has shutdown due to excessive heat build-up and/or excessive load on
the speaker outputs, the peak LED indicates when peak limiting is in operation and the Signal LED is provided to indicate when
an input signal is present.
Adequate ventilation is required for the amplifier to work within its rated limit. Ensure the vents are free of obstructions at all
times. We recommend that a 1U Vented panel be placed between amplifiers. This is to aid air flow.
Doc. BL1517
REDBACK 125 & 250W PA Amplifiers
™
www.altronics.com.au
A
1 • Shield
d "H
1 2
2 • Hot
3
3 • Cold
Diagram 1: 3 pin XLR pinouts.
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io A
t" S
2 1
3
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