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

Deckard2099

New Member
Thread Starter
Joined
Feb 23, 2024
Messages
2
More  
Preamp, Processor or Receiver
AVR X4700H
Front Speakers
Kef R300
Center Channel Speaker
Kef R250C
Surround Speakers
Kef 3001
Surround Back Speakers
Kef 3001
Front Height Speakers
Kef 2001
Rear Height Speakers
Kef 2001
Subwoofers
Genelec 7050B
Other Speakers
Genelec 8020B
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

REW Author
Joined
Apr 3, 2017
Messages
7,930
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

Moderator
Staff member
Joined
May 21, 2017
Messages
676
Location
Corpus Christi, TX
More  
Preamp, Processor or Receiver
Yamaha CX-A5000 A/V Preamp / Processor
Main Amp
Yamaha RX-Z9 AV Receiver (as multichannel amp)
Universal / Blu-ray / CD Player
Denon DCT-3313 UDCI Universal Disc Player
Streaming Equipment
Roku Express
Front Speakers
Canton Karat 920
Front Wide Speakers
Realistic Minimus 7 (front EFX speakers)
Center Channel Speaker
Canton Karat 920
Surround Speakers
Canton Plus D
Surround Back Speakers
Yamaha YDP2006 Digital Parametric EQ (front mains)
Front Height Speakers
Yamaha YDP2006 Digital Parametric EQ (surrounds)
Rear Height Speakers
Yamaha YDP2006 Digital Parametric EQ (sub)
Subwoofers
Hsu ULS-15 MKII
Other Speakers
Adcom ACE-515 (for power management)
Screen
Pioneer PDP-6010FD 60" Plasma TV
Video Display Device
Yamaha DT-2 (digital clock display)
Remote Control
Stock Yamaha Remote
Other Equipment
Audio Control R130 Real Time Analyzer
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

New Member
Thread Starter
Joined
Feb 23, 2024
Messages
2
More  
Preamp, Processor or Receiver
AVR X4700H
Front Speakers
Kef R300
Center Channel Speaker
Kef R250C
Surround Speakers
Kef 3001
Surround Back Speakers
Kef 3001
Front Height Speakers
Kef 2001
Rear Height Speakers
Kef 2001
Subwoofers
Genelec 7050B
Other Speakers
Genelec 8020B
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
 
Top Bottom