Klein + Hummel M 52, Руководство по эксплуатации

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Klein + Hummel
M 52 (D) Page 10
Loudspeaker Name
Loudspeaker Name Loudspeaker Name
Loudspeaker Name ITU
ITU ITU
ITU----R BS.775
R BS.775 R BS.775
R BS.775----1 Angle
1 Angle 1 Angle
1 Angle ANSI/SMPTE 202M
ANSI/SMPTE 202M ANSI/SMPTE 202M
ANSI/SMPTE 202M Angle
Angle Angle
Angle
Left -30° -22.5°
Center 0° 0°
Right 30° 22.5°
Left Surround -110°±10° An array to the left
Right Surround 110°±10° An array to the right
For the best stereo imaging the loudspeakers should be placed symmetrical in a
symmetrical room where objects have been placed symmetrically. This ensures the same
response from each loudspeaker at the listening position and thus good imaging. Sound
reflected back to the listening position should also be minimized using surface angling or
acoustical treatment. The acoustical axis point towards the listening position or centre of
the listening area in both the horizontal and vertical planes.
If the loudspeaker is used free standing, use a strong microphone or good quality
loudspeaker stand. For placement in a rack or on a meter bridge, suitable accessories (see
Accessories and Options section) are recommended.
The loudspeakers should be placed on a circle to ensure equal time of arrival of the audio
from all loudspeakers. Failing this, appropriate electronic time delays should be added to
compensate for time of flight differences.
Next, trim the output level of each loudspeaker so that the SPL from each loudspeaker at
the listening position is the same for the same input level.
Absolute acoustic level calibration is achieved using a sound level meter set to ‘C’-
weighting and a “slow” integration time. Play a broadband pink noise test signal set to -
18 dBFS (Europe) or -20 dBFS (USA) on the console meters and measure the sound
pressure level at the listening position. Then adjust each channel’s level (can also be
adjusted on all loudspeakers for a specific channel) until the desired level is achieved:
Application
Application Application
Application SPL
SPL SPL
SPL
Movie 85 dB(C)
Broadcast 79 dB(C)
Music Engineer’s preference
For information on setting up a subwoofer with these main loudspeakers, please refer to
the operating manual supplied with the subwoofer.