Just bought a set of rt400's with a Sony receiver.
One of the speakers sounds great, and I love it.
The catch, though, is that the other one sounds like crap. It sounds like someone's blowing into a mic during the recording or tapping on it.
And speakers work best in pairs.
I know this is really vague and probably helps you not at all, but if anyone has any ideas or good questions to ask I'd appreciate it greatly.