They did not recommend using resistors for any of the Powerline series, which include the KSN1142a, KSN1165a, KSN1188a, and a few other in the series. This gave protection to the amp from high freq (100khz or so) oscillations as well as some protection to some of their tweeters. Years ago with some of the Motorola line, not all, just some, and I have the paper from them about this, Motorola recommended a 20-50 ohm resistor in series with SOME of the tweeters. Some will tell you to place a resistor in series with the piezo tweeter, some say parallel. Most all are quoting each other and MISQUOTING the manufacturer. Ignore everything you have read about resistors and piezos. By reducing the tweeters output by 4 db it matches the woofer very well and makes for an excellent speaker. Using the KSN1165a with a 92 db SPL woofer, the tweeter does sound very bright. I have used the KSN1165a, rated at SPL = 92 db 1w 1m, with woofers in the 96-97 db range and they seem to have excellent balance. But with the Motorola/CTS units I have come to see (and others agree) that they have higher sensitivity than the published 92-93 db/wt SPL ratings. First, if they aren't a real Motorola/CTS unit, they are junk. Sometimes it is said that piezo tweeters are "harsh" or "bright". If you pay more than $2 for one made by anyone but CTS, you are being ripped off. I have seen them selling for as low as 75c each to dealers. The ones made by other companies are junk. The only piezo tweeters worthy of high fidelity or pro audio use are the Motorola/CTS units, and of those, only the Powerline Series are suited for pro audio.
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