Klein + Hummel O 300 Operating Manual page 11

On the O 300 D there is the facility to connect a Pro C 28 using the power amplifier direct input. This adds the
possibility to compensate the response for amplitude and phase anomalies resulting from the monitor's
placement in the room or the acoustic conditions of the room. In addition, a 10 band parametric equalizer and up
to 1 second delay allow the monitor to be tuned in ways not possible using the built-in analog acoustical controls.
Drivers
The drivers are the best available for their application. Long throw, efficient, low distortion drivers ensure a clean
sound quality even at high replay levels. The bass driver is loaded by the internal volume of the cabinet. The mid
and treble drivers have their own self-contained back cavities. All drivers are magnetically shielded for use next
to CRT screens and magnetic storage media. The system's SPL output and the cabinet volume can be seen in the
specifications section below.
Waveguide
The midrange and treble drivers are mounted into a waveguide. The entire front panel is constructed using Low
Resonance Integral Molding materials (LRIM™). It was computer simulated and then experimentally verified in an
anechoic chamber to give optimum control of the directivity of the midrange and treble drivers. The benefits are
increased driver loading, reduced edge diffraction and room reflections, a smoother power response, and a wide
useable listening area. The result is a reduced audio distortion and a corresponding sound quality improvement.
The waveguide has 90° x 60° dispersion and so it is generally recommended to mount the loudspeaker cabinet
horizontally. An exception to this general rule is, for example, in OB vans where the listening position is fixed and
strong side wall reflections need to be suppressed.
In all cabinet orientations, the acoustical axis should point towards the engineer's listening position, or the center
of the listening area, in both the horizontal and vertical planes – see Cabinet section for a definition of the
acoustical axis.
Cabinet
The wooden cabinet is painted using a standard RAL color. An appropriately colored pen can be used to touch up
the paintwork if it is scratched during transport or use. The following RAL numbers correspond to K+H standard
cabinet colors.
User specified RAL colors may be specified, however there are some conditions attached to this. Contact the local
distributor for details.
The acoustical axis is a line normal to the loudspeaker's front panel along which the microphone was placed when
tuning the loudspeaker's crossover during design. Pointing the acoustical axis, in the horizontal and vertical
planes, towards the listening position or centre of the listening area will give the best measured and perceived
sound quality. For three-way loudspeakers in the Klein + Hummel range, the acoustical axis is located on the mid-
point of the midrange and tweeter drivers.
Product
O 300
O 300 D
O 300 (D) Operating Manual
K+H Color Name RAL Number
Anthracite 7021
Silver 9006
x dimension
30.5 cm (12")
30.5 cm (12")
y dimension
3
14.5 cm (5 / ")
4
3
14.5 cm (5 / ")
4
Klein + Hummel
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