Speaking of the Muratas, we demonstrated the Golden Sound Ultra Tweeters at CES back in '05. The Ultras also sit on top of the speakers, which at the time were the new behemoths from Golden Sound. The Ultra Tweeters were connected by thin conventional speaker cable to the speaker terminals. With the Ultra Tweeters in, the sound was spacious, full and intriguing. With the Ultra Tweeters out, the soundstage collapsed, the sound was uninvolving, etc. Now the big reveal. The Ultra Tweeters are not super tweeters at all, they operate at a frequency above 1MHz. They produce no energy below 1MHz. I had two pairs in my system for at least a few years.