Hello, I've been using REL Q201E subwoofer along with Castle speakers. I find that my REL Q201E, connected with 10m Neutrik Speakon cable supplied in the box, is bit slower than my Castle bookshelf speakers, connected with 2.5m van den Hul speaker cables. Would replacing the out-of-box subwoofer cables improve the situation? I could not find much information on it, and would appreciate it if you could shed some light. Naresh.