The Equaliser menu is used to select the type of equaliser whose responses
REW is to model. Changing the equaliser type udates the filter panel,
applying the settings appropriate to the selected equaliser. Filters already
defined are retained where possible, but parameter values will be adjusted if
necessary to comply with the ranges and resolutions of the chosen equaliser.
The currently selected equaliser is shown to the left of the filter headings.
This menu also has entries to load and save filter settings from/to the
equaliser (where supported) and to reset the filters for the current measurement
or for all measurement to None.
- TMREQ
- Select TMREQ as the Equaliser type, offering the full range of filters
and filter settings supported by TMREQ (peaking = parametric, low pass,
high pass, low shelf, high shelf and notch). For the Peaking filters the
bandwidth in Hz between the half gain points is given by:
Bandwidth = centre frequency/Q
The TMREQ setting allows 8 filters per channel for Left, Right, Centre
and Sub and 5 filters per channel for Surr L, Surr R, Surr Back L and
Surr Back R. The adjustment ranges are:
Parameter | Minimum | Maximum | Resolution
|
---|
Frequency | 20 | 20000 | 1Hz
|
Gain | -15 | +6 | 0.1dB
|
Q | 0.1 | 50 | 0.1
|
- BFD Pro DSP1124P
- Select DSP1124P as the Equaliser type. In this setting the DSP1124P's
parametric filters are supported. The DSP1124P setting allows 12 filters
per channel. The adjustment ranges are:
Parameter | Minimum | Maximum | Resolution
|
---|
Frequency | 20 | 20000 | see below
|
Gain | -48 | +16 | 1dB
|
BW/60 | 1 | 120 | 1
|
The frequency control adjusts in the pseudeo-1/60th octave steps DSP1124P supports (20 evenly
spaced subdivisions of the ISO one-third octave intervals), with the
one-third octave and fine adjustment values DSP1124P uses shown alongside the actual
frequency in the EQ Filters Panel.
The "BW/60" control replicates the effect of the DSP1124P's bandwidth
setting. This control sets the bandwidth of the filter between the
half-gain points with:
Bandwidth (Hz) = centre frequency*(BW/60)*sqrt(2)
For example, at a bandwidth setting of 60/60 a filter centred on
1kHz with a gain of -6dB will have a bandwidth of 1,414Hz between the
points where its response crosses -3dB. This bandwidth remains constant as the
filter's gain is adjusted (Note that the Behringer DSP1100 software
package does NOT correctly reproduce the way the bandwidth
control actually operates, its bandwidths are too small by a factor
of sqrt(2)).
Defining filter bandwidth in this way is not uncommon (the TMREQ filters
use a similar definition). The relationship between Q and BW for the DSP1124P
is
Q = 60/[(BW/60)*sqrt(2)]
so the bandwidth range of 1/60 to 120/60 gives a Q range from 42.4 to 0.35.
- BFD Pro FBQ2496
- Select FBQ2496 as the Equaliser type. In this setting the FBQ2496's
parametric filters are supported. The FBQ2496 supports 20 filters per channel.
The adjustment ranges are:
Parameter | Minimum | Maximum | Resolution
|
---|
Frequency | 20 | 20000 | 1/60th octave
|
Gain | -36 | +15 | 0.5dB (1dB below -15dB)
|
Bandwidth | 1/60 | 10 | octaves, see below
|
The frequency control adjusts in approximately 1/60th octave steps (more
precisely, 1/200th of a decade).
The bandwidth control adjusts in 1/60 of an octave steps from 1/60 to
5/60 of an octave, then goes through 1/10, 1/9, 1/8, 1/7, 1/6,
1/5, 1/4, 1/3, 1/2, 3/4, 1, 1.5, 2, 3, 4, 5, 6, 7, 8, 10 octaves.
The relationship between Q and BW in octaves for the FBQ2496 is
Q = sqrt(2)/BW
so the bandwidth range of 1/60 to 10 octaves gives a Q range from 84.85 to 0.14.
- SMS-1
- Select SMS-1 as the Equaliser type, offering parametric filters only.
The filter bandwidth in Hz between the half gain points is given by:
Bandwidth = centre frequency/Q
N.B. The SMS-1 filter shapes have not been verified against an actual unit.
The SMS-1 setting allows 8 filters per channel. The adjustment ranges
are:
Parameter | Minimum | Maximum | Resolution
|
---|
Frequency | 15 | 120 | 1Hz
|
Gain | -13 | 6 | 0.5dB
|
Q | 0.3 | 20.0 | 0.1
|
- R-DES
- Select R-DES as the Equaliser type, offering parametric filters only.
The filter bandwidth in Hz between the half gain points is given by:
Bandwidth = 1.766*centre frequency/Q
N.B. The R-DES filter shapes have not been verified against an actual unit.
The R-DES setting allows 5 filters per channel. The adjustment ranges
are:
Parameter | Minimum | Maximum | Resolution
|
---|
Frequency | 20 | 120 | 1Hz
|
Gain | -10 | 10 | 0.1dB
|
Q | 1 | 15 | 0.1
|
- Generic
- Select a generic Equaliser, offering a full range of filters
and filter settings (peaking = parametric, low pass,
high pass, low shelf, high shelf and notch). For the Peaking filters the
bandwidth in Hz between the half gain points is given by:
Bandwidth = centre frequency/Q
The Generic setting allows 20 filters per channel. The adjustment ranges
are:
Parameter | Minimum | Maximum | Resolution
|
---|
Frequency | 10 | 22000 | 0.1Hz below 1kHz, 1Hz above
|
Gain | -30 | +15 | 0.1dB
|
Q | 0.1 | 50 | 0.1
|
- Retrieve Filter Settings from Equaliser Ctrl+F
- Currently this is only supported by the TMREQ setting to read the
filter settings for one channels of an AV32R DP or AV192R.
Any existing filter settings for the measurement will be overwritten.
- Send Filter Settings to Equaliser Ctrl+Shift+F
- Send the measurement filter settings to the equaliser.
Any existing filter settings in the equaliser will be overwritten.
- Reset Filters for Current Measurement Ctrl+Delete
- Used to reset all the filters for the current measurement to "None"
- Reset Filters for All Measurements Ctrl+Shift+Delete
- Used to reset all the filters for all the measurements to "None"
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