System Use
Klein + Hummel loudspeakers should only be used indoors and in these ambient conditions:
•
+10° C to +40° C (+50° F to +104° F), <90% relative humidity, non-condensing
During transport or storage the ambient conditions can be:
•
-25° C to +70° C (-13° F to 158° F), <90% relative humidity, non-condensing
Before connecting the mains power cable, ensure that the correct mains voltage is selected on the electronics
panel (230, 120, or 100 V) and that the mains power switch is off. Next connect the input signal cable (analog,
digital, or both as appropriate) and power up the loudspeaker. There will be a five second delay before sound can
be heard from loudspeaker so as to avoid noises (pops) from preceding equipment turned on at the same time.
Conversely, turning off the loudspeaker immediately mutes the audio. The K+H logo should light up together
with either the green or yellow light to indicate an analog or digital signal. If there are no lights, check the mains
power supply and the display dimmer (ensure it is not set to 0 %).
In a studio application, the loudspeakers should be placed according to the ITU-R BS.775-1 recommendations so
there is consistency of reproduction when compared to other listening environments. For movie applications,
ANSI/SMPTE 202M is the preferred standard for system setup. For home use, as materials are mixed in ITU style
rooms, one should get as close as possible to this configuration to maximize replay authenticity.
Loudspeaker Name
Left
Center
Right
Left Surround
Right Surround
For two-channel stereo, ±30° should be used. There are currently no internationally agreed standards for 6.1 or
7.1 formats. However common practice is to use one or two loudspeakers in the centre back location of a
6.1 system. In a 7.1 system common practice is to place side loudspeakers at ±90° and to push the surround
loudspeakers back to ±150°.
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.
The loudspeaker 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.
If the loudspeaker is used free standing, good quality loudspeaker stands and suitable accessories (see
Accessories and Options section) are recommended.
The benefits of flush mounting are reduced cabinet edge diffraction (smoother midrange), increased bass driver
loading (reduced bass distortion), and elimination of rear wall cancellations (smoother bass response). It is a
good idea to employ an experienced acoustic engineer to design an effective flush mounting wall. Recommended
acoustical control settings are shown in the Acoustical Controls section and a Remote Electronics Kit, shown in the
Accessories and Options section, is highly recommended to avoid heat dissipation problems and allow easy
adjustment of the controls. If the loudspeaker must be covered, use a thin open weave cloth. Two layers of very
thin material will improve opacity.
Before trimming the levels, calibrate each loudspeaker's response:
•
In studio applications, the response of each loudspeaker at the listening position should be flat.
•
In movie applications, the response of each loudspeaker should be one of the X-curve shapes, depending on
the size of the room (see ANSI/SMPTE 202M).
•
In home applications, the response of each loudspeaker should be set for subjective audio quality. This is not
necessarily a flat response, but generally, with time, a gently downward sloping response with increasing
frequency is often preferred.
Operating Manual O 410
ITU-R BS.775-1 Angle
-30°
0°
30°
-110°±10°
110°±10°
English
ANSI/SMPTE 202M
Angle
-22.5°
0°
22.5°
An array to the left
An array to the right
Klein + Hummel
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