Determination of the connectable speaker power
PRINCESS – Edition: 17.02.2005
60
FIELD SERVICE M
A
NUAL
13.2
Determination of the connectable speaker power
The real power consumption of a speaker equals the square of the voltage applied to the speaker
terminals divided through the speaker impedance (P = U² / R). The power values calculated in this
way are shown in the following table. The volume level really delivered depends also on the speaker
sensitivity and varies from type to type, but it is possible to level out these differences in certain li-
mits.
13.3
Hints for speaker connection
!
How much amplifier output will be used for the additional speakers, high or low.
!
140W (F91) / 45W (K99) are available, if the speaker power switch is in position LOW.
!
70W (F91) / 23W (K99) are available, if the speaker power switch is in position HIGH.
!
The load of all speakers has to be added.
!
If the total load of all speakers per channel is higher than the delivered amplifier outlet power,
not all speakers may work with the maximum power.
!
If the total load of all speakers per channel is lower than the delivered amplifier outlet power,
all speakers may work with the maximum power, a power reserve additionally.
!
For an efficient use of the speaker power the optimum impedance in conjunction with the output
transformer connection possibilities has to be determined.
Delivered maximum power in Watt if speakers with an impedance
of xx Ohm are connected (F91/K99).
Voltage ap-
plied to the
terminals
in Volt
rms
Terminal number
and polarity
16Ohm
12 Ohm
8 Ohm
6 Ohm
4 Ohm
2 Ohm
F91/K99
pos
neg
0.5 F91
0.7/0.2
1/0.3
2/0.6
2/1.1
2
1
0.7 F91
1 F91
1.3/0.4
2/0.6
3.9/1.1
2.8/1.5
6
5
1 F91
1.3/0.4
2/0.5
2.7/0.7
4/1.1
8/2.2
4/2.1
3
2
2.3/0.6
3/0.85
4.5/1.3
6/1.7
9/2.6
18/5.1
6/3.2
3
1
4/1.2
5.3/1.5
8/2.3
10.7/3.1
16/4..6
32/9.3
8/4.3
5
4
7.3/2.1
9.7/2.8
15/4.2
19/5.6
29/8.4
58/16.8
10.8/5.8
6
4
LOW
16/4.6
21/6.2
32/9.3
43/12.3
64/18.5
128/37
16/8.6
4
3
25/7.2
33/9.5
50/14.3
67/19.1
100/28.6
200/57.2
20/10.7
4
2
30/8.7
40/11.6
61/17.4
81/23.2
121/34.8
*
22/11.8
4
1
36/10.4
48/13.9
72/20.8
96/27.7
144/41.6
*
24/12.9
5
3
HIGH
49/14.1
65/18.8
98/28.1
131/37.5
196/56.25
*
28/15
5
2
56/16.2
75/21.6
113/32.4
150/43.2
*
*
30/16.1
5
1
59/17.4
79/23.2
119/34.9
158/46.5
*
*
30.8/16.7
6
2
67/19.4
90/25.8
134/38.7
179/51.6
*
*
32.8/17.6
6
1
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