Of course longer cables sound worse. Duh. The question is, compared to what?
Because, whatever difference there is between 1m and 5m, I can guarantee it is a whole lot less than the difference between what you will get from $4k in a 1m cable vs $4k in a 5m cable.
In other words as always it boils down to what could you do with that same money. Put that way, just about anything is better than what you have in mind. Unless of course sound quality is a smoke-screen for what really matters, not having to get up to change the disc.
Because, whatever difference there is between 1m and 5m, I can guarantee it is a whole lot less than the difference between what you will get from $4k in a 1m cable vs $4k in a 5m cable.
In other words as always it boils down to what could you do with that same money. Put that way, just about anything is better than what you have in mind. Unless of course sound quality is a smoke-screen for what really matters, not having to get up to change the disc.