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Getting them harmonics before HPF

If you’re going to use the nobles, set the spectrum knob straight up the middle for no EQ. To the left it has reductive EQ at 2k and 300hz, to the right, boosts both those frequencies. Up the middle it’s neutral! There are lots of low gain drives and boosts that you could use in this way for harmonics.

The Neve-like pedals (broadcast and colour box) will probably get you more of that transformer harmonics vibe in the same way you’re accustomed to. Some thoughts/pedals that come to mind below with that more specific transformer vibe!

Hudson Broadcast, JHS Colour Box, Origin Effects RevivalDrive, Xotic pedals, Fairfield Barbershop, Effectrode LA-1A, Strymon Dec.

Would the Origin Effects DCX Bass fit anywhere here?
 
Interesting and deceptively complicated requirements it appears.

Another possible solution would be to use an overdrive pedal with HPF and LPF on the overdriven signal path which can blend with the clean path.

The 4 on the Floor pedal does this with a variety of O/D algorithms, the lower gears are quite mild and add harmonics and fullness without appearing distorted. You can limit the bandwidth on the O/D path while the clean path remains full bandwidth.

There is a learning curve associated with all of the proposed solutions, well worth thinking this through before buying.
 
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The beauty of the RNDI is that it gives harmonics especially to the low frequencies. This is what I'm after and I want to add all those harmonics from the low frequencies before I start EQing them away.

In the RNDI specs, the total harmonic distortion + noise for -20 dBu input level at 20Hz is 0.75%. That is 50 times more than at 1kHz which is 0.015%.

Can distortion pedals offer the similar low frequency focus or do they distort all frequencies across the spectrum?

The RNDI Active Transformer Direct Interface — Rupert Neve Designs
Screenshot 2025-08-24 at 22.05.17.png
 
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I use a DCX bass as a tone shaper and sweetener (added harmonic content) right after my Cali-76 before hitting my two loop switcher and then my Bass ParaEQ connected to a RNDI-M that I have on or off the board depending on how much space I have left after filling my two loops. I use a Metro 24 /w hardcase and while it's usually a fairly small and light board I can get alot out of it depending on what's in the two loops and at the end of my signal chain. I've also got a Origin Effects Super Vintage and a JHS Color Box I can use at the end but the Bass ParaEQ with RNDI-M is clearly the most versatile thing I can use in that spot. Paired with my analog synth setup in the first loop and an HX stomp (w/ expression pedal) in the second I can cover ALOT of ground and still have a VERY harmonic rich tone. The RNDI-M adds some harmonic sweetness and expansiveness as well, it's definitely a "magic" bit of gear to my ears. The Bass ParaEQ has a HPF and it also has a a hi-Z 10MΩ input mode that works well with piezo pickups that you probably would be interested in.
 
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