I’ve done this for both speaker crossovers and tube electronics. My favorite caps tend to be one of the following depending on what I am trying to accomplish:
- Mundorf Silver Gold Oil
- Audience Auricap XO
- V-Cap
- Obbligato Gold or Ultra Premium
- Audio Note Kaisei
- Audyn True Copper Max
- Miflex
This webpage is a goldmine, basically providing references to the sonic characteristics of a multitude of capacitors: