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.
Combined with the cabinet volume, the ports load the bass driver to extend the low frequency response of the
loudspeaker. The ports have a high capacity to move air without inducing turbulence and associated
nonlinearities that degrade the sound quality.
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 410
Operating Manual O 410
K+H Color Name
RAL Number
Anthracite
Silver
x dimension
1
16.5 cm (6
/
")
2
y
x
O 410 Acoustical Axis
English
7021
9006
y dimension
1
51 cm (20
/
")
8
Klein + Hummel
10