This is basically a rant, so please bear with me. I went and picked up locally a pair of early '90s DCM CX-27 monitors that I got off Ebay. During testing I removed the acoustic lenses (two metal screens with felt between them) that's in front of the top woofer from both speakers to inspect the driver in action. The tweeters are mounted in the center of this lens and I noticed one tweeter was not OEM with a totally different magnet structure, although a very close match on the front, so I missed it during pickup. I'm using these speakers for my computer's sound so I fed them a 10Khz sine wave one at a time and measured the tweeter's output with a Radio Shack analog sound meter right up against the tweeter's grill. The OEM measured 5Db louder. I found some tweeters locally at an electronics store that were basically identical, including the magnet structure, 'cept these were rated at 100 watts max and the OEM 40 watts max. So I replaced both tweeters to ensure a matched output level and one still measures 4Db louder and swapping speaker outputs on the receiver made no difference. I'm guessing the culprit is mismatched crossovers in the speakers. What do you think it is? I'll live with it, but it still bums me out knowing this - plus it's audibly noticeable at times.