My advice is just build them without first, if they sound edgy or bright, or pick up excessive noise or hum then shield them. Good luck.
To Shield or Not to shield-That is the question!!!
I am building a couple of 4 meter balanced cables from the Duelund 20 gauge wire- I am getting conflicting advice from different folks "In The business"" as to whether to shield or not- A few has said the cables sound much better without a shield- any thoughts would be appreciated-