Double Bass Which ones have the lowest tension?

[Rodi Aravena]

By the way,
I ended up ordering the Evah Pirazzi Slaps and the D & G Oliv (as per the video with Herve {thanks Herve!}).
I wanted to order the Innovation Silver Slaps as well (while I was on a roll blowing all of my life savings, I figured, why not...?), but they seem to be out of stock everywhere (I’m based in Switzerland)...
It’s maybe better this way, after all, I do need to eat here and there...

 

[DoubleMIDI]

A lower tuning with the same string gets you a lower tension.
Too low and the string is not playable, at least in some of the common ways.
Typical range is a wholetone (solo strings in orchestral tuning) up to a perfect fourth (bumped strings, each string a position lower and adding a high C for the G). The last mostly for slap and hardly anything else.
You can get my formulas.html file from my Dropbox (link in signature and string sticky), get your Webbrowser up with JavaScript enabled and load that in there. There is also a formula for a detuned string (in halftones, down with negative numbers).
But to feel a similar result just tune down your existing strings by the same amount. The bass might need accommodate a bit over a few days for sound, but the playing feel is there instantly.