Altronics A 4085 Інструкція з експлуатації

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Operating Instructions

Congratulations on purchasing a REDBACK

Phase 4 Public Address Mixer Amplifier.

Engineered and manufactured to high standards this

unit will provide you with many years of trouble

free use.

A 4075 125 Watt Mixer Amplifier

A 4085 250 Watt Mixer Amplifier

EATURES

• Latest design and technology

• Very low noise and distortion

• 70V, 100V and 4-16 Ohm outputs

• 240V AC or 24V DC operation

• Rack mountable

• Thermal overload protection

• Thermally cued forced fan cooling

Inputs and Outputs

Inputs 1-6 can be configured for balanced microphone or line

use as desired. 3 pin XLR and dual RCA sockets are provided

for each of these inputs. Outputs are 600Ω/0dBm 3 pin

balanced XLR or dual RCA sockets for record/tape out.

Input Configuration

Inputs 1-6 include an individual 4 way dip switch enabling

selection of mic or line input operation, adjustable line input

sensitivity (100mV or 1V), Priority/VOX muting for inputs 1-3

(see below for priority details) and phantom power on/off.

Priority/VOX muting is not available on inputs 4-6.

Note, when the Priority/VOX muting function is selected (inputs

1-3) it will operate with the input set for either microphone or

line operation.

www.altronics.com.au

A 4075 125W

A 4085 250W

6 Input Mixer Amplifiers

Speaker Connections

Speakers with total impedance of 4 to 16 ohms, or speakers fit-

ted with a 70V/100V line transformer may be connected. Always

ensure that the total load of the speakers does not exceed the

rated output of the amplifier ie either 4Ω minimum for the 4-16Ω

terminals or 80Ω minimum at 100V for the A 4075 (125W) and

40 Ω minimum at 100V for the A 4085 (250W). Otherwise either

the DC or mains fuse could blow or the fault led activate and the

amp will shut down. Always be careful to avoid short circuits

and connection 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 supplied

power lead, or 24V DC to the screw terminals on the rear of the

amplifier. High currents may be drawn (8.5 amps for the A 4075

and 18 amps for the A 4085). Therefore when operating from a

24V DC power supply, confirm the capacity of the DC power

supply used.

Optional Modules

Alert, evacuation and chime tones are available with the

installation of the optional A 2073 tone generator.

Front Panel LED Display

There are six indicators on the front panel, they are ;

1) A ten point LED VU display to indicate output level.

2) A signal LED to indicate any signal present at any of the

inputs (1 to 6).

3) Overtemperature LED indicating if there is a fault such as the

amplifier overheating or a short circuit on the speakers.

4) Peak LED. See below for more details on peak limiting

5) Overload LED indicates when the wattage of connected

speakers exceeds the rated wattage of the amplifier.

6) Power on LED indicates that there is power (24VDC or

mains) to the amplifier.

BL2074