Extending speaker cables means breaking the Law. But it can be done without telling anyone even yourself. Extend your existing cable to a same quality new one, use a high standard connection plug. Make sure that every single of wire inside the coat is not break or dismiss.
Perfect extension will make you satisfy. You can hide the connection, forget what you have done, and never tell anyone.
"if it sounds good for you, it is good" - mordaunt-short said
Radovantz