Setting up a graphic EQ with REW

robbnj

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Hello all.

I'm tinkering around with a programmable DSP from Parts Express (the DSPB-K). I'm not at the point of being able to dump an EQ curve from REW onto it (yet), but I have been able to create a graphic EQ setup to at least learn how it works, the quirks, etc.
I can create a fairly complex graphic EQ, with as many "sliders" as a I choose, each one at whatever center frequency and Q that I choose,

For testing, I did a sweep of one of my office speakers, and tried to create an adjustment curve. I chose the generic/generic output, with 12 bands, and got this result:
1716991155145.png


Am I correct in assuming the lowest field in each set of three is to represent the Q for each frequency I am going to center my "sliders" at?
One issue that I can already see is that there are multiple corrections that are very close in frequency, but almost the opposite in settings. Thinking maybe I should disable the "allow narrow filters below 200Hz" option (?).

Unfortunately, I can't run a white noise tone and adjust on the fly until I get things "right", so I'm trying to get my best approximations from REW. I then plug them in to the schematic, which then gets dumped on the DSP module.
Yes, I could buy a MINIDSP, but I thrive on hands-on stuff like this.

The simple beginnings of my basic equalizer module:

1716991686152.png
 

Wayne A. Pflughaupt

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Yes, the bottom field is filter bandwidth, aka Q.

A reference graph (i.e. before EQ) would be nice to see, but there is little-to-no chance your curve needs that many filters.

Throw out any filters tighter than ~1/4-octave (5.8Q), with +/-3 dB as they will not be audible with program material. (+/- 3 dB can be audible with broad filters, though.)

The idea is to get an improvement in sound quality. This is typically achieved by addressing the worst problems, not chasing every little ripple in response.

Regards,
Wayne
 

robbnj

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Yes, the bottom field is filter bandwidth, aka Q.

A reference graph (i.e. before EQ) would be nice to see, but there is little-to-no chance your curve needs that many filters.

Throw out any filters tighter than ~1/4-octave (5.8Q), with +/-3 dB as they will not be audible with program material. (+/- 3 dB can be audible with broad filters, though.)

The idea is to get an improvement in sound quality. This is typically achieved by addressing the worst problems, not chasing every little ripple in response.

Regards,
Wayne
Thank you for the reply! I did 12 because I'm used to 10-band EQs, and 12 is more, lol.
I did another that is 6 b/c the DSP device was being finicky.

Here is the graph of the sweep I took of the speaker, from about 12" in front of it. Not properly set up for testing, I just wanted to learn, and figured I'd use this one. It's conveniently at my desk and sounds like it's got some "honk" to it that I'm interested in correcting (the spike at 1K and the dip at 1.5K, I presume)..

LINAEUM TINKERING.jpg



1717038539944.png
 

Wayne A. Pflughaupt

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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
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)
Subwoofers
Hsu ULS-15 MKII
Rear Height Speakers
Yamaha YDP2006 Digital Parametric EQ (sub)
Other Speakers or Equipment
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
Streaming Equipment
Roku Express
Other Equipment
Audio Control R130 Real Time Analyzer
Twelve inches is likely too close to get a meaningful measurement. Most manufacturers give response specified at a distance of three feet.

Regards,
Wayne
 
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