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jmead1@nycap.rr.com
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Jul 18, 2005

How to use Parametric EQ

I provided sound for a group this past weekend, and the bass player had a note that was sustaining on its own - hard to play that note. He identified this as a B-flat.

I understand that the parametric EQ would have helped to tone the one troublesome note. How would I use the parametric EQ to do that?

Thanks
Jim Mead
13 REPLIES 13
chuck-at-bose_2
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Nov 2, 2003

Re: How to use Parametric EQ

Hi Jim,

I'm going to put a step-by-step set of instructions together for you, including screen shots from the T1 simulator. I'm in the office all day today, but it might take me a while (long list of phone calls to make, etc.)...

Stay tuned...

Chuck
dstar79_2
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Oct 1, 2006

Re: How to use Parametric EQ

I would find this particularly useful too!

Thanks
Dstar
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May 11, 2020

Re: How to use Parametric EQ

Hi Everyone,

Chuck, I'm looking forward to your step-by-step instructions. We can put it in the wiki after you're done.

In the meantime, this looked on topic.

Bill-at-Bose described how he, and Hilmar, and Ken used the Para EQ to control feedback at Musikmesse in Frankfurt earlier this year.

See: Using the T1 ToneMatch™ Audio Engine Para EQ to Control Feedback
hilmar-at-bose
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Oct 13, 2003

Re: How to use Parametric EQ

Here is one method to eliminate a boomy note

a) set the level of the para EQ to a cut, say -10 dB
b) set the width to fairly narrow, say .25 ocatves
c) start with a rough estimate of the offending frequency and then move the frequency around until the offending note gets tamed best
d) you can press on the level control to toggle between on and off which gives you a direct A/B so you can judge the effect better

Once you have centered on the freqeuncy you adjust the level and width to taste.

Estimating the frequency:
Low octave of the bass is from 40 Hz to 80 Hz (E1 to E2), A1 is at 55 Hz
Low octave on the guitar is from 80 Hz to 160 Hz (E2 to E3), A2 is at 110 Hz
2nd octave on the guitar is from 160 Hz to 320 Hz (E3 to E4), A3 is at 220 Hz

Here is a cheat sheet http://www.phy.mtu.edu/~suits/notefreqs.html

Hope that helps

Hilmar
chuck-at-bose_2
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Nov 2, 2003

Re: How to use Parametric EQ

Thanks, guys. Lots of ways to look at this...
Le5
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Aug 22, 2006

Re: How to use Parametric EQ

Hi all,

With Hilmar's and Chuck's techniques, you don't need to know which frequency is the problem. But for those who like to know more...

Here is another Note versus Frequency Table similar to the link posted by Hilmar but with the addition of references to musical instruments
  • i.e. E1 - 41.20344615 Hz - String Bass Low E


This Frequencies of Music chart is also a handy tool. I have seen a variation of this one that referenced the fundamental frequencies of instruments and voices against a 1/3 octave EQ.

Musical note frequencies for Guitar and Piano

Keep in mind that an offending frequency is not necessarily the fundamental frequency being played. Often the offending frequency is a harmonic frequency that lies above the fundamental note: you play an open A on a six string guitar, fundamental frequency 110.0 Hz, offending frequency could be 220, 440, 880 Hz...
colandy
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Dec 5, 2004

Re: How to use Parametric EQ

You all have me hoping I never have to use this feature of the T1.
I'm a low tech old guy, and I hope I'm not getting in over my head.
Of course, I know that if I get stumped, I can come to this forum and get quick help.
Respect
Le5
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Aug 22, 2006

Re: How to use Parametric EQ

Hi Col. Andy,

Don't worry. Just follow Hilmar or Chuck's procedures. Follow it step by step in the comfort of your living room before a gig so you can get comfortable with the technique in a no pressure environment. Then if the need ever arises, you can impress yourself and others alike!
bigkyle-at-bose
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Nov 11, 2004

Re: How to use Parametric EQ

Actually, what's really nice about taking a little small bit of time and associating a few numbers with a few notes will do the following for you:

1) Help you better understand with other pieces of gear as to what's wrong / how to fix eq challenges;

2) Appreciate the benefits of zEQ even more.