Can anyone tell me whether upgrading the speaker cable on the denon M30 mini system would be worthwhile. I already have slightly better cable that the one that came with the system, but this was only about £1 per metre. I have a small amount of chord carnival silver plus left from my main system, which would be enough, but I don't know whether this system can take banana plugs. Excuse my ignorance, because I don't know what thes connectors on the denon are called, but they have the little plastic pieces that you lift up to open, slot in the wire, and put back into position. Are there any other connectors I could use for this system? Any help would be appreciated.