KLEIN+HUMMEL O 410 Mode D'emploi page 8

The parametric equalizer is a single stage PEQ filter with gain (+4...-12 dB), frequency (20...200 Hz) and Q (1...8)
controls designed to control nonlinearities seen below 200 Hz. These nonlinearities can come from boosts caused
by constructive interference or strong room modes. It is possible to bypass the parametric equalizer using the
bypass switch.
It is advised that an acoustical measurement system be used to set these controls in the most appropriate way
for the loudspeaker's location. This is especially true of the parametric equalizer's controls. In the absence of
appropriate equipment the following settings are recommended as a good starting point for further adjustment:
Loudspeaker Location
In a corner
Next to or flush mounted in a solid wall
Next to or flush mounted in a soft wall
Free standing in an untreated room
Free standing in a well-treated room
*** This indicates that the parametric equalizer will probably need to be used. Its use will depend on the situation
so no standard recommendation can be made here.
O 410 Bass, Midrange and Treble Acoustical Controls
Note: the parametric equalizer's response is not shown on the above graphs as it is freely adjustable within the
stated parameter ranges.
The input and output controls consist of a finely graduated control called "Input Gain" and a coarse "Output
Level" control. This allows the loudspeaker to be matched to a wide range of equipment outputs whilst
maintaining the desired acoustical output. As with any other component in the audio chain, it is best to use the
lowest gain for the application so as to minimize amplification of the preceding equipment's source noise. To
check this, if the noise drops dramatically when the input cable is unplugged, the noise is coming from the source
not the loudspeaker. The default setting is "0 dB" and "100 dB SPL at 1m". This gives an output level of
100 dB SPL at 1m when the input signal is 0 dBu (0.775 V). The most sensitive setting (most acoustical output
for a given input voltage) is "6 dB" and "114 dB SPL at 1m", and the least sensitive setting is "-9 dB" and
"100 dB SPL at 1m".
Operating Manual O 410
Acoustical Controls
-7.5 dB
-2.5 dB
-2.5 dB
English
Bass Mid Treble
O 410
-
-5 dB -
-
-1.5 dB -1 dB
- -
O 410 Parametric EQ Acoustical Controls
Klein + Hummel
Parametric
- ***
- -
- -
***
- -
6