KLEIN+HUMMEL O 810 Mode D'emploi page 14

preceding equipment turned on at the same time. During this period the POWER ON light flashes, then it turns
solid indicating that audio can be heard. If there are no lights, check the mains power supply. Conversely, turning
off the subwoofer immediately mutes the audio from the subwoofer and loudspeakers connected to it.
Positioning Positioning
Positioning Positioning
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 Loudspeaker Name Loudspeaker Name 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 should point towards the listening position or centre of the
listening area in both the horizontal and vertical planes.
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 between the subwoofer and each loudspeaker to
compensate for time of flight differences. This can either be a Pro C 28 inserted into the signal chain before the
loudspeaker, or a Pro C 28 attached to the power amplifier direct input on an O 300 D.
An angles chart angles chart angles chart has been included in the package to help position the loudspeakers at the correct angle. Simple angles chart
locate the center of the angles chart at the listening position, and then use a XLR cable or piece of string
stretched tightly between the center of the angles chart and the acoustical axis of each loudspeaker to ensure
that each loudspeaker is positioned at the correct angle. A document defining the acoustical axis of K+H
loudspeakers can be found at www.klien-hummel.com.
Ports located on the front panel all allows Klein + Hummel loudspeakers and subwoofers to be easily flush
mounted. The principle benefits are that it gets the cabinet out of the room (less space taken up in the room),
increased driver loading (reduced distortion), and elimination of rear wall cancellations (smoother response). It is
a good idea to employ an experienced acoustic engineer to design an effective flush mounting wall. If the
loudspeakers and subwoofers must be covered, use a thin open weave cloth. Two layers of very thin material will
improve opacity.
The 80 Hz crossover is low enough to give good flexibility when placing the subwoofer(s) in the room. Placement
depends on whether one or multiple subwoofers are used (see next section).
Si Si Si Single and Multiple Subwoofer Systems ngle and Multiple Subwoofer Systems
ngle and Multiple Subwoofer Systems ngle and Multiple Subwoofer Systems
One subwoofer can be used in a system if space or budget is limited. However, it should be checked that the One subwoofer
One subwoofer One subwoofer
output capacity is sufficient to match the main loudspeakers otherwise the subwoofer will be the limiting
component in the system. Please refer to the "Product Selection Guide" for building balanced systems. In a single
subwoofer system, the subwoofer should be located against the front wall, and positioned slightly left or right of
the middle of the front wall. Calibration and positional adjustments can be made from this starting point.
Multiple subwoofers can be used in a system to increase the low frequency SPL capacity of the system. Mutual Multiple subwoofers Multiple subwoofers Multiple subwoofers
coupling between subwoofers occurs when they are placed within a quarter-wavelength of each other. This is
approximately 1 m (3') for frequencies up to 80 Hz. If the LFE mode is set to "LFE → SUB ONLY (<120)", the
O 810 / O 870 Operating Manual
All manuals and user guides at all-guides.com
ITU- - - - R BS.775 ITU ITU ITU R BS.775- - - - 1 Angle R BS.775 R BS.775
-30°
0°
30°
-110°±10°
110°±10°
Page 14 of 96
1 Angle 1 Angle 1 Angle ANSI/SMPTE 202M ANSI/SMPTE 202M ANSI/SMPTE 202M ANSI/SMPTE 202M
Angle Angle Angle Angle
-22.5°
0°
22.5°
An array to the left
An array to the right
Klein + Hummel
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