As far as I am aware, you can't take anything off the music with power supplies. Only RFI in power supplies can cause brightness in the music. If your music gets darker then surely that is how it must be. That's going by what I have been told.
RFI or noise in the circuit affects the analogue output parts and adds brightness, or so they say.
It may sound like you are losing detail by the darker signature. However you're gaining it in two ways.
- Brightness makes us keep our volume lower.
- With brightness gone, the mids and bass textures and details are more balance in the mix.
I used to use some Grado 225e which were bright. When I EQ'd them and took off the brightness, the music was much richer sounding.