Visualizing Analog EQ Curves With Open Sound Meter

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What do console EQ curves actually look like?
I’m just as much a fan of mixing with your ears and not your ears, but oftentimes it’s helpful to have another reference point for how your tools work and interact with each other.
Today we’re using Open Sound Meter to look under the hood of an analog console to uncover the actual response of the EQ circuit. It has published specs, but does it actually perform and represent what’s in the manual?
These types of projects not only help you understand EQ better, but also your measurement tools. We often think of measurement as only consisting of a reference microphone in front of a speaker - but you can measure almost anything with a linear and time invariant response!
We’ll uncover:
- The clever shelf design of the EPM8
- Do channel-to-channel settings match?
- How to set up this type of test
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[@nickevansaudio]

This video inspired me to crack out my old Studiomaster Logic Twelve analog desk and put it through its paces with OSM v1.3! Some VERY interesting results for sure!! For example HF shelves that affected pretty much the whole audible spectrum to some degree of magnitude! Also loss of c. 1-2dB at both ends of the HF, MD, LF potentiometer extremes. Fascinating though!!

[@pioman2805]

Hey! A very good demonstration of how semi-parametric equalizers work on analog consoles still widely used at events. We ask you to analyze 10, 15 and 31 band graphic equalizers and also audio managers (DBX P2, DBX VENU360, DBX 4800, BEHRINGER DCX2496) widely used in events and shows. Thanks.

[@henningriez7655]

I actually have that desk in my livingroom for private jamduties, i like the colours xD

[@GeorgeElenaRempel]

Wow! For a long time i thought of doing this visualization. Now I can spare my time

[@maxmoses8449]

Thank you for this

[@mitas3484]

Man this is awesome. Are you just running pink noise into the mic channel, and output into smart?

[@montelcarlos143]

Thanks teacher

[@FreeKeenan]

I Google and couldn't find a thing about gersen shelf filters, Michael Gersen, unless the transcripts misspelled gersen? What's the procedure to phase and time align a 3way system? Horn, mid, sub drivers? BTW I nailed it tuning my small power pack old PA the other day. It's just my 2way I have set up in the living room. The bass, impact, tuning, came out incredible. Added a tilt eq centered at 520hz due to the reflective room and the boxes in my face. It sounds amazing!! Knocked 3 candles to the floor all the way upstairs and nosey Lucy 2 townhouses down complaining at my door. Your paid class paid off!!! Thank you! I just need the procedures on how to tune a 3way system.

[@PeejaiiOanes]

I'm gonna try this out with generic/sub-standard (counterfeit) analog mixer. haha. Curious with the results.

[@MichaelCurtisAudio]

Go for it!