K+H O 500 C Installation And Operation Manual - page 32
Page 32
5.2 Parametric EQ
General
In addition to the previously described local EQ,
the O 500 C is fitted with 10 fully parametric EQ
bands, which can be selected to be either bell
or shelving and highpass/lowpass character with
adjustable gains, Q-factor and slopes.
The individual EQ bands are arranged in a
sequence of 10 menupoints of the EQ menu,
every EQ band has it’s own menupoint. The first
EQ band can be found in menu
3 EQ1,
the last
one in point
12 EQ10
. All adjustments can be
stored in menu point
4 EQ Setup
under a user
selectable name, and can be recalled at any
time.
These EQs may be used in addition to the room
EQs to achieve a more detailed correction of
unlinearities in the frequency response, which
have their origin in the local positioning of the
monitor.
The main area of use is for the compensation of
unlinearities which are mainly caused by the
room itself ( construction, shape, material etc. )
which can not be fully compensated with the
room EQs.
In this chapter the complex operations and
adjustments of the parameteric EQ’s are
described and backed up by practical examples
and diagrammes. Please note: all examples and
diagrammes given may not be useful for an in-
dividual setup!
In a normal, average listening zone ( room ) the
absorption of materials in the room can be very
different, and are very much depending on the
frequencies. As a result there are frequency
depending levels in the diffuse sound field and
the sound field as it is recognized by the listener,
both adding up in a non-linear frequency
response.
Description of parametric EQ’s
Following the various adjustments and
operation-modes of the 10-band parametric EQ
will be described in detail, and made more
understandable by offering some examples of
frequency responses. All 10 bands are equipped
with the same properties and adjustments as
described in menu
3 EQ1 ... EQ10.
Type:
Here the basic mode of the individual EQ-
band is determined.
The following options will be possible:
o High shelving with 12 dB/Oct. slope
o High shelving with 6 dB/Oct. Slope
o Low shelving with 12 dB/Oct. Slope
o Low shelving with 6 dB/Oct. Slope
o Peak (bell characteristc)
o Highpass with 12 dB/Oct. Slope
o Highpass with 6 dB/Oct. Slope
o Lowpass with 12 dB/Oct. Slope
o Lowpass with 6 dB/Oct. Slope
The figures 5.2/1 and 5.2/2 are showing
Fig. 5.2/1: Low and high shelvingfilter, slope: 6
and 12 dB/Oct., Gain = +6 dB, Q-factor = 0.7
Fig. 5.2/2: High and lowpasses, slope: 6 and 12
dB/Oct., Gain = 0 dB, Butterworth characteristic.