Other Controls - KLEIN+HUMMEL O 410 Mode D'emploi

Input Sensitivity
Rotary Switch [dB]
-9 dB
-8 dB
-7 dB
-6 dB
-5 dB
-4 dB
-3 dB
-2 dB
-1 dB
0 dB
1 dB
2 dB
3 dB
4 dB
5 dB
6 dB
Below are some examples of how to calculate the output level:
Input signal [dBu]
Input gain setting [dB]
Output level setting [dB SPL]
Sound Output of Loudspeaker [dB SPL at 1m]
In Europe 0 dBu is -18 dBFS (EBU standard R68). In the US +4 dBu is -20 dBFS (SMPTE standard RP155). These
dBu values should equate to 85 dB SPL at the listening position. It is typical in the broadcast industry to use a
reference level of 79 dB SPL at the listening position. Near field loudspeakers can be as close as 1 m from the
listening position, whereas loudspeakers in a Dolby certified movie mixing room should be at least 5 m from the
listening position. In the examples below, it is assumed that the listener is inside the room radius and thus the
sound field decays according to 20 log
attenuation at the source (-6 or -10 dB) is required for SPL calibrated near field listening, but this facility is
always available in the console.
The maximum input level that the input stage can accept is +19 dBu (approximately 6.9 V). To avoid clipping the
input stage, increase the input level of the loudspeaker by up to 6 dB. The maximum acoustical output of the
loudspeaker is limited by the protection system. In general, larger loudspeakers can play louder and for longer
periods than smaller loudspeakers.

Other Controls

The display dimmer is used to attenuate the display when the loudspeaker is used in low light situations. The
display can be completely turned off for use behind acoustically transparent screens.
Four settings are available: 100, 66, 33, and 0 %.
The power On/Off switch turns the mains power completely on and off. There is a soft start function in the power
supply to reduce the effect of turn-on transients on the power line, thereby avoiding blown fuses.
The voltage selector switches select between 230, 120, and 100 V. Set this appropriately BEFORE applying main
power to the loudspeaker. An appropriate internal main fuse value is automatically selected. The applied mains
power voltage should be within -15% and +10% of the selected value.
Operating Manual O 410
Acoustic output level [dB SPL] of the loudspeaker at 1m
Output Level switch = "100 dB"
91
92
93
94
95
96
97
98
99
100 (default)
101
102
103
104
105
106
0 (0.775 V)
0
100
100
(r), however this may not always be the case. Note that some additional
10
Input signal [dBu]
Input level setting [dB]
Output level setting [dB SPL]
Listening distance [m] (dB change)
Loudspeaker Output Level [dB SPL]
Maximum input signal before clipping
when input signal is 0 dBu
Output Level switch = "114 dB"
+4 (1.23 V)
0
100
104
0 (0.775 V) +4 (1.23 V)
-1
100
5 m (-14 dB) 5 m (-14 dB)
85
17 dBu 17 dBu
English
Klein + Hummel
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
+6 (1.55 V) +16 (4.89 V)
0 0
100 100
106 116
-5
100
85
7