User Manual

KH 310 | 13
Examples of sound pressure levels as a function of the input and output level of the KH 310:
Input signal
dBu
0
(0.775 V)
0
(0.775 V)
+4
(1.23 V)
−20
(77.5 mV)
Input gain KH 310
dB
0 −15 −4 −15
Output level KH 310
dB SPL
100 100 94 114
Sound pressure level
dB SPL at 1 m
100 85 94 79
Activating ground lift
To avoid unwanted hum or buzz associated with the input signal cables or source equipment,
you can internally disconnect pin 1 of the XLR socket from the loudspeaker electronics’ chassis
ground (see table on page 9):
X
Set the GROUND switch 6 to “LIFT”.
For safety reasons, the electronics chassis ground is always connected to the mains
power earth pin.
Adjusting the brightness of the Neumann logo
WARNING
Danger of hearing damage due to unexpected high sound pressure levels!
If the Neumann logo is switched o, it is not obvious whether the product is switched on or
o. In this case, unexpected high sound pressure levels can cause hearing damage.
X
Always set the audio sources connected to the loudspeaker to a low output level before
they deliver an audio signal.
X
If you switch o or dim the Neumann logo, mention this to everyone who works with this
loudspeaker or the connected audio sources.
To dim or switch o the Neumann logo in low light level environments or when the loudspeaker
is placed behind an acoustically transparent screen:
X
Set the DISPLAY BRIGHTNESS switch 7 to:
• “30 %”, “60 %” or “100 %” to adjust the Neumann logo to dierent brightness levels.
• “OFF” to switch o the Neumann logo.
When the loudspeaker’s protection system is active, the color of the Neumann logo
changes from white to red. The brightness of this red limiter indication corresponds to
the setting of the DISPLAY BRIGHTNESS switch 7 (“30 %”, “60%” or “100 %”). Howe-
ver, you cannot completely switch o the limiter indication, as it appears with a bright-
ness of 30 % even if the DISPLAY BRIGHTNESS switch 7 is set to “OFF”.
EN