What is Sneharizer ?
What is Sneharizer ?
I would recommend replacing the pads with Dekoni Sheepskin Leather Pads and using a balanced cable with them.
These two mods improved the sound at least on my 99 classics drastically.
In terms of a DAC I would get something neutral. The 99s already have a quite warm tuning so you want something that is neutral.
I am using NPM + Authelia for this