Redback A 4230 Manuel utilisateur

www.altronics.com.au

Operating Manual

A 4230 30W Public Address Amplier

A 4240 60W Public Address Amplier

A 4250 100W Public Address Amplier

Redback® Proudly Made In Australia

OVERVIEW

These compact 1RU rack mount ampliers are suitable for both stand alone PA system use, or as zone ampliers in

larger systems requiring local inputs. All models operate on 240V ac or 24V dc for battery backup operation.

The input consists of a 3-pin XLR which can be set for either balanced mic level (3mV) or balanced line level (2V), adjusted

via a rear mounted trimpot. A dual RCA input is also provided with adjustable sensitivity of either 300mV or 1V.

Phantom power is also provided on the input XLR.

The circuit includes protection features in case of output over voltage, over current and over temperature. All are self

re-setting once the fault condition is removed. Visual indication via front panel LEDs display amplier status at all times.

FEATURES

• Compact 1RU 19” rack mount design

• Balanced mic or line input

• Phantom power

• Overload limiting

• Over voltage limiting

• On demand fan cooling (60W and 100W versions only)

• Over temperature shut down protection

• Dual input connectors

• Variable input sensitivities

• 240V ac / 24V dc operation

• Australian designed & manufactured

www.altronics.com.auRedback® Proudly Made In Australia

REAR PANEL

1 2 3 4 5 6 7 8

2 1

Manufactured in Australia By

Altronic Distributors Pty. Ltd.

www.altronics.com.au

100V

OUT

24V DC

240VAC @ 50Hz

Input 1

Balanced

Input

Sensitivty

1 2 3 4 5 6 7 8

DIP Switches

(Refer to table1)

Line Balanced

(3mV) (2V)

Resettable DC FUSE

Output

30W

Fuse

3 Amp

5 Amp

7.5 Amp

60W

100W

Mic Line

- +

1 • Shield

2 • Hot

3 • Cold

Balanced Input

Conguration

24651

Table 1 : DIP Switch Settings

1-6,8 Not Used

7Line input

Input Senitivity

1V 300mV

SW Input

On O

Output

30W

Fuse

1 Amp

2 Amp

4 Amp

60W

100W

AC Fuse (M 205)

RISK OF ELECTRIC SHOCK

OPEN BY QUALIFIED

PERSONNEL ONLY !

CAUTION

Volume

1 240V AC Input

Connect to a 220-240V AC @ 50Hz power source.

2 100V Output

Speakers tted with a 100V line transformer may be connected. Always ensure that the toal load of the

speakers does not exceed the rated output of the amplier ie 333Ω minimum at 100V for the A 4230 (30W),

166Ω minimum at 100V for the A 4240 (60W) and 100Ω minimum at 100V for the A 4250 (100W). 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. Refer to Fig 2 and Fig 3 for more details about the

impedance of speakers and how to check the impedance.

3 DIP Switch Settings

The A 4230 range of ampliers have a set of options which are enabled via the DIP switches 1-8.

Switch 1-7 Not used

Switch 8 sets the input sensitivity for the Dual RCA line input to either 1V or 300mV. Note: this only affects

the line input.

4 Audio Input

Input 1 can be used for mic or line input operation. The dual RCA line input has adjustable line input sensitivity

of either 300mV or 1V (Set by DIP switch 8). The balanced XLR input has an adjustable input sensitivity from 3mV

up to 2V. Phantom power is available on the balanced XLR input. Volume is adjusted via the volume pot on the

rear of the unit.

5 Resettable DC Fuse

Used to protect the unit when powered from 24V DC. This fuse is resettable by pressing the red button.

6 24V DC Input

Battery Backup: Provision has been provided to run the amplier from a suitably rated 24V battery system in the

event of a mains failure. Using appropriately rated cable, connect the battery to the “24V DC In” terminals.

Observe correct polarity when connecting.

Fig 1

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TROUBLE SHOOTING

If the REDBACK amplier fails to deliver the rated performance, check the following:

No Power, No Lights

Make sure amplier power switch is on. Make sure mains power switch is on at the wall. Check the mains and DC fuse.

Replace with only the correct type and rating. Over rated fuses with invalidate warranty.

Distorted Output

Check that the speaker type is correct for the output that you are using (ie. 4-16O, 70V or 100V line). Check for any short

circuits on the speaker line. Check speaker line impedance. Note you must use an inpmedance meter for this such as

Altronics Q 2001.

Very Low Output Volume

Make sure that the input is the correct level (check for shorted connectors). Check for any short circuits on the speaker

line.

Check input DIP switches are set correctly.

Continually Blows Fuses

Make sure that the speaker line is not shorted. Check speaker types, ratings and if on correct output.

Amplier Keeps on Cutting In & Out

Make sure that there is adequate ventilation around the amplier. Check the vent slots on the front,top and sides are not

covered or blocked and the fan on the rear is functioning correctly. Check also speaker types, ratings and for any short

circuits on the speaker line.

About 100V Line Speaker Systems

Wiring speakers in parallel for 100V line: Where several speakers are to be used

at one time, on one circuit, it becomes necessary to use speakers fitted with

line-matchingtransformers. This is to overcome the effects of connecting speakers

in parallel and cable losses. The amplifier generally has an output voltage of

100 volts. In this configuration the total wattage load on the amplifier is derived

from adding all the line transformer primary tap ratings together. For example, 70

one watt speakers will have a total speaker load of 70 watts. Or alternatively, it is

conceivable to connect 100 one watt speakers to a 100 watt, 100 volt line amplifier.

Measuring 100V Line Speaker Impedance: To measure amplifier system load,

you must use an impedance meter in order to measure the AC resistance of the

connected speaker network. Impedance cannot be measured with a standard multi-

meter, as this measures the DC resistance. Use the Altronics Q 2001 or similar im-

pedance meter.

70V 100V

Load System System

0.5W 9.4kΩ20kΩ

0.66W 7.12kΩ15kΩ

1W 4.7kΩ10kΩ

1.25W 3.76kΩ8kΩ

2W 2.35kΩ5kΩ

2.5W 1.88kΩ4kΩ

3W 1.56kΩ3.3kΩ

5W 940Ω2kΩ

7.5W 626Ω1.3kΩ

10W 470Ω1kΩ

70V 100V

Load System System

15W 313Ω666Ω

20W 235Ω500Ω

30W 156Ω333Ω

40W 117Ω250Ω

60W 78Ω166Ω

100W 47Ω100Ω

125W 37Ω80Ω

250W 19Ω40Ω

500W 9.4Ω20Ω

Altronics Q 2001 Impedance Meter

Fig 2

Fig 3

www.altronics.com.auRedback® Proudly Made In Australia

SPECIFICATIONS

POWER OUTPUTS

A 4230: .................................30 watts RMS

A 4240: .................................60 watts RMS

A 4250: ...............................100 watts RMS

Distortion:..........................< 0.5%, @ 1kHz

FREQUENCY RESPONSE

Mic input:....................50Hz - 12kHz, -3dB

Line input: ..................50Hz - 15kHz, -3dB

SENSITIVITY

Mic input: ............................3mV-2V balanced

Line input:.................................300mV-1V

*Specications subject to change without notice

SIGNAL TO NOISE RATIO

Mic input: .........> 75dB below rated output

Line input:........> 81dB below rated output

OUTPUT CONNECTORS

Speakers: ...........................Screw terminals

INPUT CONNECTORS

Inputs: ........3 pin XLR balanced or 2 x RCA

24V DC power: ...................Screw terminals

240V AC power: .........IEC power connector

A 4235 30W Mixer Public Address Amplier

A 4245 60W Mixer Public Address Amplier

A 4255 100W Mixer Public Address Amplier

User manual revision number: 1.0 05/07/2013

Distributed by Altronic Distributors Pty. Ltd.

Phone: 1300 780 999 Fax: 1300 790 999 Internet: www.altronics.com.au

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