I had two rt25i speakers and a cs245i. I went to Circuit City and they had the rt35i and the cs400i on sale because of a trade in. Well they actually gave me .09 cents on deal so it was a free upgrade. I got it home and the 35i speakers sound great. The cs400i sounds muffled. What could be the problem? Do you think the tweeter is blown. I really feel like I got a deal on these. It might still be worth it to replace the tweeter if needed. What is the process I should go through to troubleshoot this? Thanks!!!