EQ Bandwidth (e.g. 1/60 OCT) to Q conversion for EQ

[Deckard2099]

Hi all - picked up a Behringer DSP8024 for £50, to try my hand at tuning my dual subs. It has 6 parametric eq channels, however the bandwidth is displayed as follows: 1/60 to 2 octaves, adjustable in steps of 1/60 octave.

What would be the best way to use this with REW's EQ function? Setting up a generic EQ with 6 PK filters gives an adjustable Q from 0 to 10. Is there a way to convert from 1/60 Oct to a Q value? Help would be much appreciated!

 

[John Mulcahy]

Perhaps the bandwidth behaves the same as the DSP1124P/FBQ1000, try measuring some filter settings with a loopback through the unit and comparing them to the REW predictions when using the DSP1124P setting. If that's no good the configurable EQ has an option for bandwidth in octaves, but again you would need to check against the unit.

 

[Wayne A. Pflughaupt]

AFAIK, Behringer is the only equalizer manufacture that uses the maddening xx/60 octave designation for filter bandwidth.

It will require a couple of steps to translate the 8024’s xx/60 settings to a more traditional octave and hence bandwidth figure.

The first thing to do is to reduce the Behringer’s filter designation you’ve selected to its lowest common denominator. Thus, 6/60 octave becomes 1/10 octave; 20/60 becomes 1/3 octave, etc. If you’re not good with fractions, you can plug the values into this online converter.

Once you have the reduced octave figure, you can convert it to a Q value with this online converter. Personally, I like this handy chart.

Regards,
Wayne

 

[Deckard2099]

Thanks both! With the combination of the linked resources and the configurable bandwidth setting in the PEQ, I am up and running. Measurements taken before and after EQ and reading as expected. If anyone runs into this thread in the future, the 8024 has an accompanying windows application that shows a graphical readout of the parametric EQ, which was helpful as a quick comparison to the REW filters.

The Behringer is not ideal, but it was a cheap purchase to attempt some tuning before picking up a minidsp. Works OK enough for the meantime.

Dave