EQ for Upright Bass?

I'd lean to the Equilux, but I'll certainly be trying out the Drebbel, too, once it's built.

Alas, I'm not gigging at the moment — just the occasional jam or open-mic night.



However...
The most important EQ for upright, IMO...
Anyone want to recommend a PedalPCB board that would work best as an EQ for upright bass
@jdduffield, I can't emphasize this enough (hence the quote and "@" shoutout)...


A GOOD HPF!


or



I feel quite strongly about this topic, as I had a gigging experience where I had no HPF for the first set (boomy, horrible intonation 'cause I couldn't hear the notes, made the whole room throb and Band-Leader NOT happy, audience wanting to puke and questioning "WTFudgsicle's going on?"... 'twas truly horrible. Tres MAL for an entire freq'n set. Then...

Got HPF up and running again for 2nd and 3rd sets — no mushy-flubby-drubby, just crisp full beautiful dark-chocolatey BASS, could hear my (bad) intonation, band-leader happy again, audience enjoying the music finally ...

Made me a true-believer.

I had HPF on my Radial PZed-Pre, but it was just a switch so only helped a little. Then I got the Francis Deck HPF (FDeck III). Used it from when I got it to the above scenario... gigs/jams/rehearsals/any-amplification-situation — won't leave home without HPF. Works well on slabass, too, because the amp & speaker(s) are not trying to produce useless rumble so the amp runs cooler, better sound from amp and speaker(s).

Fdeck schematic has been graciously made public by Mr Deck. I've got a Perf layout for it, PM if interested.


CHECK OUT @Passinwind's HPF/EQ DIY projects


HPF ÜBER ALLES !
 
I am still planning to release my one band PEQ/HPF that runs on +/-15V into my open source Github repository pretty soon. There will also be +/- 15V Baxandall EQ and resonant LPF boards to go with it, The LPF board is already vetted and the two band Bax board is in the build queue for hopefully next month. And the a DI and maybe a headphone amp module as well.

This older pedal design worked great for my now late jam mate on her nice carved upright:

URB_WTHPF.jpg
 
I had opportunity to test out my upright with my Ictineo (haven't finished my Drebbel yet) at this past weekend's jam, but it wasn't engaging.
Had it last in my chain, and signal got through the bypass so it wasn't the patch-cables' fault.

I had so looked forward to trying out the circuit with upright, 'twas a major drag when the light came on but the sound did not.
My trouble-shooting queue of commercial pedals has been growing at an alarming rate recently.
 
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