Equalizer-Auswahl

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Equalizer auswählen

The Equaliser panel is used to select the type of equaliser whose responses REW is to model. Changing the equaliser type updates 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 in the panel title and in the EQ Filters panel.

TMREQ

The TMREQ equaliser offers 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. The adjustment ranges are:

Parameter Minimum Maximum Resolution
Frequency 20 20000 1 Hz
Gain -15 +6 0.1 dB
Q 0.1 50 0.1


BFD Pro DSP1124P

The DSP1124P equaliser supports the DSP1124P's parametric filters, allowing 12 filters. The adjustment ranges are:

Parameter Minimum Maximum Resolution
Frequency 20 20000 see below
Gain -48 +16 1 dB
BW/60 1 120 1

The frequency control adjusts in the pseudo-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 Equalizer-Filter.

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

The FBQ2496 equaliser supports the FBQ2496's parametric filters, allowing 20 filters. The adjustment ranges are:

Parameter Minimum Maximum Resolution
Frequency 20 20000 1/60th octave
Gain -36 +15 0.5 dB (1 dB below -15 dB)
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.


DCX2496

The DCX2496 equaliser supports parametric filters (labelled "BP" for Band Pass) and low and high shelving filters (with 6 and 12 dB/octave slopes). It allows up to 9 filters per channel, depending on the other processing the unit is doing. The parametric filter bandwidth in Hz between the half gain points is given by:

Bandwidth = sqrt(gain)*centre frequency/Q

The adjustment ranges are:

Parameter Minimum Maximum Resolution
Frequency 20 20000 106 steps per decade
Gain -15 +15 0.1 dB
Q 0.1 10 20 steps per decade

The frequency control adjusts in steps of 1/106th of a decade. The Q control adjusts in steps of 1/20th of a decade, i.e. there are 20 Q values between 0.1 and 1 and another 20 between 1.0 and 10.


SMS-1

The SMS-1 equaliser supports parametric filters only, allowing 8 filters. 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 adjustment ranges are:

Parameter Minimum Maximum Resolution
Frequency 15 120 1 Hz
Gain -13 +6 0.5 dB
Q 0.3 20.0 0.1


R-DES

The R-DES equaliser supports parametric filters only, allowing 5 filters. 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 adjustment ranges are:

Parameter Minimum Maximum Resolution
Frequency 20 120 1 Hz
Gain -10 +10 0.1 dB
Q 1 15 0.1


QSC DSP-30

The DSP-30 equaliser setting supports parametric filters only, allowing 20 filters. The filter bandwidth in Hz between the half gain points is given by:

Bandwidth = centre frequency/Q

N.B. The DSP-30 filter shapes have not been verified against an actual unit.

The adjustment ranges are:

Parameter Minimum Maximum Resolution
Frequency 20 20000 0.1 Hz
Gain -120 +12 0.1 dB
Q 0.3 50 0.01


Crown USM-810

The USM-810 equaliser supports parametric filters only, allowing 10 filters. The filter bandwidth in Hz between the half gain points is given by:

Bandwidth = sqrt(gain)*centre frequency/Q

N.B. The USM-810 filter shapes have not been verified against an actual unit.

The adjustment ranges are:

Parameter Minimum Maximum Resolution
Frequency 20 20000 1 Hz
Gain -24 +24 0.1 dB
Q 0.1 35 0.01


ADA PEQ

The ADA equaliser supports parametric filters only, allowing 12 filters. The filter bandwidth in Hz between the half gain points is given by:

Bandwidth = centre frequency/Q

N.B. The ADA filter shapes have not been verified against an actual unit.

The adjustment ranges are:

Parameter Minimum Maximum Resolution
Frequency 20 20000 1 Hz
Gain -10 +10 0.5 dB
Q 0.1 10 0.1


Xilica XP2040

The XP2040 equaliser setting supports parametric filters only, allowing 16 filters. The filter bandwidth is specified in octaves, but the corresponding bandwidth in Hz is shown in the filter controls panel. The adjustment ranges are:

Parameter Minimum Maximum Resolution
Frequency 20 30000 1 Hz
Gain -30 +15 0.25 dB
BW 0.02 3.61 0.01 octaves


MiniDSP

The MiniDSP equaliser supports the same filter types and resolutions as the Generic setting, but for 6 filters. It is aimed at the MiniDSP plug-in Advanced mode, which allows filters to be specified by their biquad coefficients. The Send Filter Settings to Equaliser action writes the filter coefficients to a file in a format suitable for use with the MiniDSP software (note that the a1 and a2 coefficients are negated per the MiniDSP format). An advantage of this is the very high filter frequency and Q resolution it allows, permitting exact targeting of modal resonances. The MiniDSP plug-in has an Import REW File button on its Parametric EQ configuration screens to load the files.


MiniDSP-96k

The MiniDSP-96k Equaliser supports the same filter types and resolutions as the Generic setting, but for 5 filters. It is aimed at MiniDSP plug-ins that operate at 96 kHz.


nanoAVR

The MiniDSP nanoAVR equaliser supports the same filter types and resolutions as the Generic setting, but for 10 filters.


waveFLEX DSP A8

The DSP A8 equaliser supports the same filter types and resolutions as the Generic setting, but for 5 filters operating at 96 kHz.


Emotiva UMC-200

The UMC-200 equaliser supports parametric filters only, allowing 11 filters. The filter bandwidth in Hz between the half gain points is given by:

Bandwidth = sqrt(gain)*centre frequency/Q

N.B. The UMC-200 filter shapes have not been verified against an actual unit.

The adjustment ranges are:

Parameter Minimum Maximum Resolution
Frequency 20 20000 256 steps
Gain -15 +3 0.25 dB
Q 0.25 24 0.125


Emotiva XMC-1

The XMC-1 equaliser supports parametric filters only, allowing 11 filters. The filter bandwidth in Hz between the half gain points is given by:

Bandwidth = centre frequency/Q

The adjustment ranges are:

Parameter Minimum Maximum Resolution
Frequency 20 20000 1 Hz
Gain -64 +6 0.5 dB
Q 0.6 50 0.01


Generic

The Generic Equaliser supports a full range of filters and filter settings (peaking = parametric, low pass, high pass, low shelf, high shelf and notch) based on the Robert Bristow-Johnson 'Cookbook' equations. 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. The adjustment ranges are:

Parameter Minimum Maximum Resolution
Frequency 10 22000 0.01Hz below 100Hz, 0.1Hz below 1kHz, 1Hz above 1kHz
Gain -120 +30 0.1 dB
Q 0.1 50 0.01


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