Plixir conditionners are the only one I heard that didn’t affect dynamic.
don’t know how much power you need so it might or might not be in your price range.
I use a plixir 400 to power my Router/Switch/Streamer/Dac and each components benefit in a non-subtle way from the Plixir. Especially the DAC ( Lampizator) sounds magical with the Plixir