I agree with Audiofeil, I have heard tons of speakers, and ones with the top tweets from many brands, and they all can let the "SSS" word out.. I have heard pairs that exhibit this behavior, and a quick amp or cable change can all of a sudden sound totally different.. Many times its the recording or the source, but if it is every single recording than you will want to look into a DAC or a Cartridge, I have had Cartridge issues that Amplify this as well as certain CD players, and others that are perfect balance.
Again you could take one of the ruffest sounding tweeters around and possibly not get a ton of siblance out of it if your front end feeding them are not amplifying it in the first place.
Again you could take one of the ruffest sounding tweeters around and possibly not get a ton of siblance out of it if your front end feeding them are not amplifying it in the first place.