Altronics Redback A 4395 Manuel d'utilisation - Page 6

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A 4395
500 Watt Power Amplifier
SPEAKER CONNECTIONS
Speakers with a total impedance or 4-16Ω may be connected to the terminals marked 4-16Ω on the rear of the amplifier.
Speakers fitted with line transformers (either 70V or 100V) may be connected to the corresponding terminals on the rear
of the amplifer. Always ensure the total load of the fitted speakers does not exceed the rated output of the amplifier
(ie 500 watts) otherwise damage may result. When fitting speakers with line transformers the impedance of the load
cannot be measured using a standard multimeter. An impedance meter is required. Fig 3 lists the impedance at certain
loads of speakers fitted with 70V and 100V line transformers. So for a total load of 500 watts using 100V line transformer
fitted speakers, the impedance of the speaker load should be 20Ω.
i
About 70V & 100V Line Speaker Systems
Wiring speakers in parallel for 70/100V line: Where several speakers are to
be used at one time, on one circuit, it becomes necessary to use speakers tted
with line-matching transformers. This is to overcome the effects of connecting
speakers in parallel and cable losses. The ampli er generally has an output
voltage of 100 volts (70 volts is typically used in North America, however
operation is similar). In this con guration the total wattage load on the ampli er
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 ampli er.
Measuring 70/100V Line Speaker Impedance: To measure ampli er 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 multimeter, as this measures the dc resistance. Use the Altronics
Q 2001 or similar impedance meter.
AUDIO CONNECTIONS
The amplifier has two audio inputs, with input 1 either a balanced XLR input or dual RCA line input which is internally
mixed to create a mono signal. Input 2 is a dual RCA which is internally mixed to create a mono signal. Both inputs have
adjustable input sensitivities of 100mV or 1V set by the DIP switches on the rear of the unit.
A music input on the front of the amplifier is also provided for connection of portable devices. This input when
connected, over-rides the rear input 2 audio source and is adjusted via the volume 2 level control.
A VOX function is also included which when enabled will allow input 1 to mute input 2.
Fig 4 shows a typical install where the A 4395 has a balanced microphone connected to input 1 and a Line level source
connected to input 2. If DIP switch 2 is set to "ON", the microphone will VOX mute the CD player connected to input 2.
CAUTION
!
RISK OF ELECTRIC SHOCK
OPEN BY QUALIFIED
PERSONNEL ONLY
230V AC @ 50Hz
(Fuse 10A M205)
Made in Australia by
Altronic Distributors Pty Ltd
www.altronics.com.au
6
Redback® Proudly Made In Australia
Speakers tted with
100V line transformers.
DIP Switch Settings
+
SW
Item
1
Input 1 Sensitivity
100V
2
VOX Enable
3
Phantom Power Mic
4
Input 2 Sensitivity
+
24V DC
OUT
70V
(1A Max)
RESETTABLE
+
FUSE 20 AMP
4
-16Ω
Load
70V
100V
0.5W
9.4k
20k
0.66W
7.12k
15k
1W
4.7k
10k
1.25W
3.76k
8k
2W
2.35k
5k
2.5W
1.88k
4k
3W
1.56k
3.3k
5W
940
2k
7.5W
626
1.3k
10W
470
1k
15W
313
666
20W
235
500
30W
156
333
40W
117
250
60W
78
166
100W
47
100
125W
37
80
250W
19
40
500W
9.4
20
On O
1V
0.1V
On O
On O
1V
0.1V
LINK TO
INPUT
CHARGE
24V DC
BACKUP
RESETTABLE
BATTERY
FUSE 20 AMP
1 • Shield
2 • Hot
3 • Cold
REDBACK
CD
Fig 4
Input 1
Line
Balanced Mic
2
L
R
Input 2
DIP Switches
1
2
3
4
L
R
1 2 3 4
Balanced
2
1
3
Mic Wiring
Line
www.altronics.com.au
Fig 3
1
3