Yes, as you and 40 other people have stated.Pretty sure it's 1600 a PAIR
It's a result of the AMT being pretty big and not really waveguided at all. AMTs seem to be one of those things that are an almost absurd amount of effort to implement properly,Is this directivity narrowing regarding the highs and ribbon tweeter issue or are there speakers who handle this better?
Am I being naive by saying that this looks extremely similar to the horizontal directivity? The THD is terrible, so I don't expect EQ to do anything worthwhile, but otherwise this seems like more of a positive than it's being let on as.
That is a simple manifestation of frequency response error as you move up or down due to timing of the two drivers changing in the crossover region. At some point instead of adding, they start to cancel causing that weakness. It is a standard "feature" in all but coaxial drivers and three-way speakers with a midrange.Has there been any study on small holes in directivity such as the ones in the 'Vertical Listening Window' chart?
Right. And according to this chart, these holes seem to cancel at certain angles completely (-30dB) I'm just wondering if you know whether a gap this size is particularly noticeable, or can be ignored in most listening angles. I do wonder how well the average listener notices sharp, small spikes up or down in the frequency response on an otherwise even curve.That is a simple manifestation of frequency response error as you move up or down due to timing of the two drivers changing in the crossover region. At some point instead of adding, they start to cancel causing that weakness. It is a standard "feature" in all but coaxial drivers and three-way speakers with a midrange.
Often a small dome tweeter with a well designed waveguide will have more constant and thus not too increasing beaming in the last octave, one of the reasons probably why Genelec while using ribbons in the past doesn't use them anymore. One advantage though is that with such a non-symmetric drive you can get different horizontal and vertical directivities while designing such a good waveguide is not an easy task.Another positive trait is that their relatively large vertical and or horizontal dimension actually makes them a better match for a midwoofer in the crossover region, since they will have a narrower dispersion at these low frequencies compared to a small dome. This, coupled with a modest waveguide, is why the AMT units in ADAM monitors perform so well off-axis.
I heard the same thing. You do have to align vertically. I moved around a lot in both axes and it makes a difference.Oh they are audible. Go in front of a speaker as it is playing and gradually go above and below the tweeter axis. You should hear the tonality change due to those holes at the angle shown in measurements (and computed using simple math).
Glad you could clarify. I'm a believer in the measurements you provide, and I have to say that to a layman, this looks good off-axis up to 10khz.Oh they are audible. Go in front of a speaker as it is playing and gradually go above and below the tweeter axis. You should hear the tonality change due to those holes at the angle shown in measurements (and computed using simple math).
Good point. It's hard to separate the objective performance of a speaker from the price of it. The price sets a subjective expectation. Charge one tenth this price and suddenly these are not too bad, a few flaws here and there but altogether enjoyableI don't think these are "bad" speakers. I also think judging them is difficult due to many factors working in tandem. It is just that if you are going to charge this much, then it basically should not have much of any flaws.
Come on, the Heil drivers debuted in the ESS1 in like 1976. Granted a lot of additional work wasn't done until the 2000's when a bunch made their way into mainstream consumer audio, but those original ESS AMT's had quite a fan club-I remember the day and the time I first heard them almost the way average people might remember when John Lennon was shot. It was in a Fall Saturday morning, good weather, and I am in an audio store in Tustin, CA, and the clerk has just cued up some Peter Green guitar (Fleetwood Mac, Albatross). My jaw dislocates.Are ribbon/AMT/planar tweeters just eye candy at this point, a must have for boutique brands to justify their prices? What are their redeeming qualities again? I rarely see smooth treble response from them, and directivity is always sub-par. But I guess they bring that "sparkle"? I'm a skeptic, I think they need more advancement. A good dome tweeter in a waveguide for me.