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Hints of connectable speaker loads
PRINCESS – Edition: 17.02.2005
59
FIELD SERVICE MANUAL
13
70v output transformer (0043157)
If you want to work with different speakers with any other impedances or with 70V systems, we re-
commend to use the output transformer. You can than connect speakers between 2
Ω
and 16
Ω
toge-
ther but complete independent to each other.
If you want to connect several speakers by means of an output transformer pay attention to the follo-
wing hints:
1.
To avoid an interruption of all speakers by the overload protection circuit or a decrease of vo-
lume by the clipping stage, the total power outlet of the amplifier should not be exceeded.
2.
All speakers must be connected with the correct polarity.
3.
To operate each external speaker with the desired volume level, pay attention to the respective
efficiency, impedance and load limit.
4.
To avoid cable losses on long speaker lines (more than 60 feet) and low impedance, 70Volt-
systems should be used as much as possible.
5.
If speakers with low impedance (2
Ω
, 4
Ω
) are used, each speaker should have its own line with
sufficient cross-section.
6.
When an output transformer is used no speakers should be connected to the screwing terminals
on the power amplifier board P4A.
7.
Note: The 2-channel option can not be used in connection with an output transformer without
modifying the pre-amp board.
The internal speakers can be operated with lower volume (switches on the connecting board). In po-
sition HIGH power consumption of the internal speakers is approx. 32W, in position LOW approx.
10W.
13.1
Hints of connectable speaker loads
The maximum power output per channel is 170 Watts (rms) for F91 and 55 Watts (rms) for K99. The
power consumption of the connected speakers can be higher (i.e. 200 W) than the maximum remai-
ning power outlet of the amplifier. If the power consumption is lower (i.e. 10 W) than the maximum
remaining power outlet of the amplifier, it can be adapted by means of the output transformer.
LEFT
RIGHT
to amplifier
to speaker
crossover
70V
0V
70V
0V
K99
F91
17,6V 14,1V 11,8V 3,2V 1,1V
0V
17,6V 14,1V 11,8V 3,2V 1,1V
0V
1
2
3
4
5
6
high
low
32,8V 30V
22V
6V
2V
0V
32,8V 30V
22V
6V
2V
0V
1
2
3
4
5
6
high
low
output transformer F91 / K99 no. 0043157
CLASS 2 WIRING
volume internal speakers
speaker power switch
LH channel
speaker power switch
RH channel
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