User Manual

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14 | KH 120

Recommended sound pressure levels:

Application Sound pressure level

Film 85 dB(C)

Broadcast 79 to 83 dB(C)

Music No deﬁ ned reference levels

If the Neumann logo ﬂ ashes red, the loudspeaker’s protection system has been activated. To

avoid this and achieve the desired output level, use larger loudspeakers or add a bass man-

aged subwoofer to the system.

Examples of sound pressure levels as a function of the input and output level of the KH 120:

Input signal

dBu

(0.775 V)

(1.23 V)

-20

(77.5 mV)

INPUT GAIN control

0 -15 -4 -15

OUTPUT LEVEL switch

dB SPL

100 100 94 114

Sound pressure level

dB SPL at 1 m

100 85 94 79

Compensating for video delay (lip sync)

Signal processing in LCD, Plasma and LED screens, digital projectors with LCD or DLP

chips, and video processors used in broadcast centers delays the video signal.

The delay is disturbing when audio leads video by more than 20 ms or lags by more than

40 ms.

To compensate for the video signal delay, the audio signal of the KH 120D can be delayed

by up to 409.5ms, which is 10.2 frames at 40 ms/frame or 12.3 frames at 33 ms/frame.

The same value should be used for all loudspeakers in the system.

Please consider the information on latency on page 15.

Compensating for listening distance diﬀ erences (time-

of-ﬂ ight)

Loudspeakers placed at di erent distances su er from time-of-ﬂ ight di erences which

a ects imaging. The DELAY resolution is small enough (0.1 ms) that the delay can be used

for time-of-ﬂ ight adjustment (3.44 cm or 1 3/8" steps). To compensate for the time-of-ﬂ ight

delay, the audio signal can be delayed by up to 409.5 ms, which is 140.87m (462'2").

Loudspeakers positioned closer to the listening position should be delayed to be the same

as the furthest loudspeaker from the listening distance.

Example

Loudspeaker A listening distance: 1.50 m

Loudspeaker B listening distance: 1.65 m

Time-of-ﬂ ight di erence: 0.15 m

So loudspeaker A should be delayed by the time equivalent of 0.15 m which is 0.436 ms

(0.15 m / 3.44 cm x 0.1 ms). The nearest setting of the DELAY rotary switches E is 0.4 ms,

so set the 0.1 ms switch to position 4.

Please consider the information on latency on page 15.

KH 120 D

x 1.6 ms x 0.1 msx 25.6 ms

DIGITAL DELAY