It's not that bad if one wants the center to beam right to the listener with low interference with L/R, though ignoring the ground an ceiling reflections of mainstream constructions with round tweeters.A lot of goofy MTM center speakers lie horizontally. Yes, it's a bad idea.
Correct. Namely, they have severe phase cancellation induced dips right where our hearing is most sensitive around crossover points in the 1-4k region.I'd like to clarify why Amir recommends using floor or ceiling absorption. It is because the early reflections may have FR significantly different from direct sound, which will have some effect on timbre.
My opinion is that diffusion is generally only useful to break up a slap in a larger room without reducing higher frequency reverb times too much (i.e., making the room "dead"). And I agree, ideally you'd want a good amount of LF absorption to treat the most difficult modal issues... unfortunately, that requires more complex (i.e., pressure trap) absorption, or a lot of low density velocity absorption.IMO a proper ceiling cloud will be LF absorption biased and have significant diffusion. I don't know what would be the optimal mix of those things, though, and what other considerations would be important.
AFAIK our hearing is less acute between 1-2.5kHz because there you have a transition from phase-sensitive to level-sensitive hearing mechanisms.Namely, they have severe phase cancellation induced dips right where our hearing is most sensitive around crossover points in the 1-4k region.
IMO a proper ceiling cloud will be LF absorption biased and have significant diffusion. I don't know what would be the optimal mix of those things, though, and what other considerations would be important.
I think you're right. I hung a bunch of 4" thick broadband acoustic panels about 5" from the ceiling, then covered the rest in foam diffusers. It passed the, "Friend listened and liked the results" test with flying colorsIMO a proper ceiling cloud will be LF absorption biased and have significant diffusion.
I disagree, but with the caveat that it's effectiveness will greatly depend on the room, the speakers and your listening position. Like all treatment options, throwing them around willy nilly will generally lead to more problems than it solves.Given that almost all non-coaxial speakers have pretty nasty cancellations around the crossover(s), it stands to reason that fairly heavy absorption hanging from the ceiling to heavily reduce the ceiling ER is much more important than any side wall or rear wall treatment, regardless of horizontal directivity behavior. Even with coaxial designs, I'd consider it quite important.
It is immediately audible hanging a cloud in a room that has a reflective ceiling - everything gets "tighter" and the soundstage becomes much clearer and less fuzzy.