I would rather stay away from MB Quart based on the threadstarter's posting that the current set sounds sharp, most probably a wiser way is to stay away from metal tweeters, THOUGH, not ALL metal tweeters would sound sharp or bright, but most MB Quart tweeters are.

Problem with most Malaysian buyers is that they tend to freak out when they hear the names of those "Big Names Shops" as if it's known to cut-throat without even being there before. The fact is, most big name shops like ACP, KKLau, Auto Gadget or KF Audio actually have decently and competitively priced products and not just slaughter away, in fact, i would rather say the people that manage these places are far friendlier than thought and often would give a better offer.

Typical RCA sound would be ground loop and also bundling of RCAs and Power cables together, though, certain RCAs wouldn't be affected, but well, then again, usual shops would have some cap ayam RCA without much shielding anyway.