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Understanding the Mixer EQ

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Mark Bliss
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Joined: Fri Jan 20, 2012 3:59 pm
Location: Out there

Understanding the Mixer EQ

Postby Mark Bliss » Sat Jan 13, 2018 9:13 am

The mixer EQ has "fixed" frequencies and "Q"

Here is a pink noise spectrograph with the mixer EQ set "flat"-

Pink Noise -12dB RMS.png
Pink Noise -12dB RMS.png (469.69 KiB) Viewed 1259 times

And here is the same audio signal with the EQ set to full cut in all three frequencies-

Pink Noise mixer cut.png
Pink Noise mixer cut.png (506.78 KiB) Viewed 1259 times

And again at full boost-

Pink Noise mixer full boost.png
Pink Noise mixer full boost.png (476.01 KiB) Viewed 1259 times

Noting the frequencies affected:
The bass is a shelf filter, rolling off at about 300. Range is +/- 15 dB.
The treble is a shelf filter, rolling off at about 5K. Range is +/- 15 dB.
The mid frequency is a bell filter based a little below 3K, Range is +/- 12 dB.

Also of interest is the effect on RMS and peak levels.

My conclusion- I use the low and high frequencies often in mixing for subtle adjustments. The limits of the range of boost/attenuations mean they arent really for "big moves"
(IE turning down the low freq. to max cut isn't a HPF for example)

I dont use the mid range much. Its utility is limited due to its "fixed" frequency and "Q"

(* Suggestions have already been logged to update this in the future. Suggestions include adding a sweepable freq. range function and adjustable Q.)
Stay in tune, Mark



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Location: Chester, UK

Re: Understanding the Mixer EQ

Postby msnickybee » Fri Jan 26, 2018 6:50 am

Useful stuff!
I actually do sometimes use the Mixer EQ - maybe I'm in the minority there - but only for subtle quick tweaks as you describe.
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