Dynacord GIGANT II Operating Manual page 10

D) Loudspeaker Connections:
The "GIGANT II" amplifier is suitable for the Connection of all commonly used
acoustic radiators or loudspeaker boxes. For this purpose 4 output jacks with 4 to
16 ohms (27), (26), (25), and (24), one output jack for 100 volts (23) confotming to the
safety regulations and a jack (28) for the connection of a monitor loudspeaker with
a volume control (30) thereunder are provided at the rear of the unit. As mistakes
are made quite often when connecting several loudspeakers to one amplifier, we
should like to draw your attention to the following:
As a general principle, the connected sound radiator or box must be able to take
up the output (watts) of the respective amplifier. If no sound radiator or box of
suitable power rating is available, several loudspeakers must be connected. For this
reason a loudspeaker with a least 180 watts or two loudspeakers each 100 watts
and/or four loudspeakers each 45 watts, etc., must be connected to the "GIGANT II".
As the manufacturer's rating of the loudspeakers mostly represents the maximum
permissible load, it is of course possible or even recommended to use one or even
several loudspeakers capable of handling a total of more than 160 watts.
The higher the power handling capacity of the loudspeaker or loudspeakers in
relation to the output of the amplifier, the more safely will overloading and/or damage
to the loudspeaker be prevented.
As the connected load (impedance, expressed in ohms) changes when connecting
several low-impedance loudspeakers, it is necessary to have available different output
impedances. We have solved this problem to the effect that 2 output jacks (24) and (25)
can be switched over electrically from 4 to 8 and/or from 4 to 8 and 16 ohms by
changing the plugs on the impedance plug panel. The other 2 jacks (26) and (27)
have a fixed connected load of 4 ohms (are connected in parallel). So-called tele-
phone-type plugs are used as connection plugs which for Identification are made
in red for our loudspeaker line cords.
ATTENTION! Overloaded loudspeakers are not covered by warranty.
The next page illustrates the manner in witch the loudspeakers should be connected
in the individual cases. The illustrations A to F show how the plugs on the plug panel
must be plugged for proper impedance and for obtaining the best possible output
matching and tone reproduction.
Illustration E shows how the loudspeakers are connected in the case of 100-volt
Operation (in most cases necessary only with existing permanently installed domestic
Systems). By using transformers with different input impedances (to be installed or
already installed in the loudspeaker) it is, for example, possible to match a 100-watt
loudspeaker to a lower rating. The connected loads for the desired handling capacity
are given in Illustration E. An important factor is that the power consumption of all
loudspeakers must not exceed 160 watts.
Example: 2 loudspeakers, each 100 watts, are to be connected to the "GIGANT II".
160 watts are available for these 2 loudspeakers, that means 80 watts for every loud­
speaker. According to the table in illustration E, with 80 watt matching is effected
to 125 ohms per loudspeaker.
18
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ft
Connected loads of the individual transformers when the loudspeaker power rating is
20 W = 5 0 0 ohms
25 W = 4 0 0 ohms
30 W =333 ohms
45 W =2 2 0 ohms
50 W = 2 0 0 ohms
60 W =166 ohms
80 W = 1 2 5 ohms
100 W =1 0 0 ohms
*
162
162
4 2 42
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3 loudspeakers (at least 3 x 7 5 /5 5 watts)
1
1
0
0
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16 2
42 42
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4 ,2 yp.
16
4 loudspeakers (at least 4 x 5 5 /4 0 watts)
^
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etc.
until
total
is 16 0
watts
19