Excessive sibilance and edge....treat room?

Another way I could state it is to say that HF transient response is audibly better with hard vs soft tweeters in that HF are more highly defined with them, thus less sibilant. The microscope analogy is a predetermination by the recording venue and therefore the effective original. Whatever it is is the playback goal. I don't see how that relates to this topic. I think you are misplacing subjectivity with communication. Language is after all the largest barrier. Having only a keyboard to communicate with exacerbates this problem to the extreme imo. Probably the main catalyst to the subjectivist disposition so ubiquitously held in virtually all the forum sites. Consensus took a serious back seat with the inception of the internet. I can relate to the 'metal' dilemma which is why I like mylar ribbons the best.

"The microscope analogy is a predetermination by the recording venue and therefore the effective original. Whatever it is is the playback goal. I don't see how that relates to this topic. I think you are misplacing subjectivity with communication."

Again, its all subjective, but it relates to the topic because regardless of how the sibilance occurs, people are going to want to try and fix it. (At least the people that are bothered by it. I have friends that don't mind it in the least). Personally, I don't think my example is a predetermination by the recording venue and therefore the effective original. The reason for that, is vocal sibilance is not a natural occurrence. Its a product of the recording/playback chain.

What speakers use mylar ribbons? I don't think I've ever heard one before. I tried Magnepans, but they were way too sibilant for me. lol.

You used the microscope analogy as a bigger than life product as it would relate to a recording. Being closer to the subject doesn't necessarily conclude with sibilance. In any case, ime it's been a lack of performance on the amp's part that has been bothersome to me as far as sibilance is concerned. If an amp isn't fast enough to negotiate the important consonants to life like realism, it's a poor design no matter what else it's good at imo.

I should say mylar on aluminum foil such as those on my Kappa 9s. Or the solid mylar domes on the Kef 105s.

"You used the microscope analogy as a bigger than life product as it would relate to a recording."

Now I get what you are saying. I didn't mean it like that. I was thinking in terms of distance or proximity. For example, when a voice is very closely miked, its kind of like having someone very close to you, talking directly into your ear. Its not natural, or normal even. Since you hear so much more detail, I thought a microscope was a good example.

"Being closer to the subject doesn't necessarily conclude with sibilance."

Your absolutely right. You don't have to get sibilance just because you are close. I do feel, however, that the chance of sibilance occurring does increase in situations of close proximity. But even then, results can vary. Different equipment, room, personal taste, etc.., will all play a part.

"In any case, ime it's been a lack of performance on the amp's part that has been bothersome to me as far as sibilance is concerned. If an amp isn't fast enough to negotiate the important consonants to life like realism, it's a poor design no matter what else it's good at imo."

At least you know where the problem lies. Sometimes its very difficult to pin down the source of the problem. It can be any component, not just the speakers.

"I should say mylar on aluminum foil such as those on my Kappa 9s. Or the solid mylar domes on the Kef 105s."

I thought you may be referring to those folded ribbon tweeters that some companies are now using. Martin Logan is probably the best example. The tweeters on your Kappa 9's look similar to the ribbon tweeters that Genesis used.

There's lots of issues other than amp specifics especially when vinyl is the source but once everything is in order, I really think it's the amp you then are actually listening to. It always seems to be recognizable through any other changes. At a certain level I think it becomes the weakest link. On a descending scale of importance, I place it at the top for the reasons I've stated.

I've seen the Kappa Emit type tweeters on other brands of the same era. Can't recall any names.