Higher Power

Built around the TPA3118, Higher Power is a 60W class d solid state power amp solution. 

Don't be fooled, it'll push your 4x12 plenty but it shines on a 1x12 or 2x12 at bedroom levels. The buffer inside sets up your signal with a nice flat response going into the power section so you can drop your favorite preamp pedals in front.

Output impedance of 4-16ohm. 

Designed to be fed with 24VDC center negative. It can run on as little as 9v with power scaling down to approximately ~10W. This is not recommended to be powered by your daisy chain or iso-supply. Recommended to be ran on its own power supply. (sold separately by others).

Do not use a class d power amp with an attenuator/loadbox. It’s not necessary and it will damage one or the other.  

Around the house I typically use a One Spot (nothing else on it) for 9v and it's stupid loud for my basement through my 4x12. 

Here is a 18vdc center negative option from LoveMySwitches: https://lovemyswitches.com/pedal-power-supply-18vdc-2a/

If you're interested in getting the maximum out of it, you could go with a 24VDC supply like this one: https://www.amazon.com/dp/B08MQ2KM2N but you will require a polarity reverser to make the center positive become center negative: https://www.amazon.com/dp/B004EBG5QE

Note: I have tested several 24v options that resulted in increased noise from the PSU.