Yoir manxwho is building that wal-ish bass in build diaries is using a lusithand onboard dual NFP preamp for his build.
I posted recently about it here. This is what i wrote about the jazzplate:
So i used to own a wal, and the thing i really loved aboutnit was the electronics. It never occured to me that there were other vendors making the same style which turned out to be a folter based preamp. I suppose i never made the connection. I figured it was just Wal's thing.
So i deep dove into the idea of getting one.
Went with the lusithand as they had the dropin plate. JTEX makes a cool looking one out of canada.
Woth the lusithand, i went with the single NFP for my jazz as the double you need to rout.
It dropped in perfectly and the sound is, to me, perfect.
As opposed to preamps which basically just boost your tone, i find this preamp actually helps you dial in a smoothness and thickness otherwise unattainable in an active pre.
My recent switch to flats also seems to have really taken to this preamp. In 25years of playing i have never turned up the tone knob past 20-30%. I was easily at 80-90% last night punching through and sounding incredible.
I honestly can't believe it.