Suggestions for Bass/Guitar preamp to pair with TDA8932B P.A.?

[J M Fahey]

At the moment I am designing a new line of amps based around TPA3118, which will be fed from generic/surplus Laptop bricks or LED lighting SMPS, anything between 18 and 24V DC, simply because they are cheap and plentiful.

So I am designing preamps, effects loops, distortion, etc. fed from +24V single supply instead of classic +/-15V or +9V so together they become full amps, both pedal sized and small combos.
Basically what you are trying to do 

In September there is a Musical Expo (think mini NAMM / Expo Música / Frankfurt Messe) in Buenos Aires where I will show these new products, so I must hurry.

[blackcorvo]

I'll love to see what you come up with!

I've also gotten one of these:

https://www.alldatasheet.com/datasheet-pdf/view/1542047/REICU/WRA1215S-2W.html

Specifically, A1215SDL-2W, Which is a DC to isolated dual rail converter. If it works well, I'll use it to power the preamp - it's smaller than any of my other DC converters anyways.
For now I'll try to figure out at what signal level the amp cuts out, and try to keep my volume under that level.