How can you tell the old .5" voicecoil tweeters from the 1" voicecoil ones? I recently did an A/B comparison with my M22tis and noticed something strange. The M2s sounded more "muffled". The woofers certainly look different (My M2is have an older design woofer), but the tweeters look the same aside from a slighly different logo. I know you could probably tell by removing the tweeters from the cabinet and looking at the back, but I'd like to avoid that if possible.