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Electrical
Power output: 125 Watts RMS
Distortion: < 0.5% @ 1kHz
Output line: 100V, 70V or 4-16Ω
Signal to noise ratio (Limiting by-passed)
Mic inputs: Typically 75dB below rated output.
Line inputs: Typically 81dB below rated output.
Line output: 600Ω balanced, 0dBV
Mic input frequency response: 50Hz - 12kHz, -3dB
Line input frequency response: 50Hz - 15kHz, -3dB
Input sensitivity: 100mV-1V (line), 3mV balanced (mic)
Power supply: 240V AC or 24V DC
Current draw: 350mA standby, 8A full load @ 24V DC
240V AC power: IEC power connector
24V DC power: Screw terminal
Protection: 5A AC, 10A DC fuses
Vox muting: 60dB below rated output
LED indicators: Power, fault, all other indicators on LCD
Controls
Master Volume: Controls all output level
Line Inputs: Volume
Bass: ±10dB @ 100Hz
Treble: ±10dB @ 10kHz
Power: On/Off switch
Mechanical
Dimensions: 483W x 380D x 88H mm (410D inc. handles)
Weight: ≈14.5kg
Optional Add Ons
A 2711 MP3 USB/SD Audio Module
A 4573 Alert/Evac Tone Module
A 2280B Remote Volume Wallplate
Specifications
Rear Panel
Product Guide
A 4275C Phase5
®
125W 100V Public Address Mixer Amplifier
Redback
®
Public Address Amplifiers
®
Connections
1
240V AC input
2
100V/70/4-16Ω line terminals
3
10A DC resettable blade fuse
4
24V DC input terminal
5
24V DC battery charge link terminal
6
RJ45 Interface port
7
a. Remote Volume Control Contacts
b. PTT Contacts
c. Power Fail Contacts
d. 24V DC Switched Output
8
Tape Out RCA
9
Send / Return RCA
10
Preamp XLR Output
11
Input 1 DIP Switch Selections
12
Input 1 Balanced 3 Pin XLR
13
Input 1 Line Stereo RCA
Architect Specifications
A 4275C
The amplifier shall have a power output of 125 Watts RMS. The unit shall have 6 inputs. All inputs shall
consist of one balanced XLR microphone input and dual RCA line input. In addition, a local music input
shall have a 3.5mm stereo line unbalanced input. Frequency response shall be 50Hz – 12 kHz (-3dB) for
microphone inputs and 50Hz – 15 kHz (- 3dB) for line inputs.
The unit shall have separate volume controls for each microphone / line input and tone controls providing
10dB cut or boost at 100Hz and 10dB cut or boost at 10kHz.
The unit shall operate from 240V AC or 24V DC with a LED indicator, and be fuse protected. The unit shall
have overload protection via DC fuses.
The amplifier shall be capable of delivering full power of 100V RMS into a 333 ohm (125W) inductive load
with less than 0.5% distortion measured at 1 kHz and with system hum and noise typically -75dB with
all volume controls at minimum. The speaker outputs shall be 100V and 4-16 ohms provided via screw
terminals. Tape output shall be provided via dual RCA sockets. Internal muting shall be provided by the VOX
muting circuit. Muting should be configurable so that input 1 shall over-ride inputs 2, 3 and local music or
input 2 shall override input 3 and local music.
Amplifier status readout shall be provided via front panel LCD readout. The amplifier shall be housed in
a high quality 2RU metal chassis suitable for rack mounting. The amplifier shall be a REDBACK PHASE 5
model A 4275C.
Notes: We do not recommend using this amplifier with a combination of low
impedance and 100V line speakers.
1
2 3 4 5 6 7 8 10
13
2
12
Inputs
Mic 1-6 Line 1-6 Send/Return
3 pin XLR female
(balanced)
Stereo RCA RCA sockets
Outputs
Speakers Tape Out Preamp Out
Screw terminals
for 100V line,
70V line and 8-16Ω
Mixed mono
Dual RCA
sockets
3 pin XLR male
(balanced),
RCA socket
9
11
a. b. c. d.