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.

[blackcorvo]

After almost a year, I have updates.
First of all, my apologies for being away so long, life got in the way and I had to push the project aside.

That said, the updates are:

- I ditched the battery-powered idea, removed the holder, and closed up the holes I had made when installing them (3D printing pen filament and a lighter is a surprisingly effective combo);

- I figured out most of my problems come from the amp being REALLY sensitive. Apparently the mono module board is preset from factory at 36dB for the BTL configuration, giving it an input sensitivity so small you can drive the amp into distortion by just plugging your instrument directly into it;

- I removed the buck converter (as it was adding more problems than solving), and added 2x 560uF capacitors in parallel going between V+ and ground for more bass stability;

- I've tested the amp now with both the internal 8 ohms 25w speaker (I mistyped in the first post as it being 30w btw), and an external 4 ohms 25w speaker, at both 12v and 19.5v, and had no issues with it cutting out even when using my Joyo Bass headphone amp pushing it at full volume. It did distort on both speakers and both PSUs, but did take more signal to get there at 19.5v;

- added a series 3u3 50v capacitor with the tweeter, and it helped reduce some distorting on the trebles from it being driven too hard;

Right now, I'm reconsidering what I should do regarding the preamp. Putting the Lead/Bass 12 aside for now, and I'm actually thinking of something more like, perhaps, a Honeytone's preamp, just with a tone stack replacing the single tone control. I do enjoy how those little beasts sound.