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Re: dam my horns image - me too !

Kerry, as John and Tom stated, the maintenance of on axis response in an exponential or tractrix may be "correct" in terms when viewed by on-axis response, but their power response falls of just the same. It is reflected in beaming, or the loss of energy off axis rather than a fall off across the board. Unfortunately, there is no equalizer that can widen the beam. With a waveguide, when you equalize the drop in power response to make the on-axis flat again, you bring up the off axis energy in the same manner, for flat on-axis pressure AND flat power response again.

I'm thinking that instead of active equalization to boost HF, you can get a driver that is of higher sensitivity and passively reduce the low frequency output at the power response break.

Of course, the issue is whether one believes a constant directivity is needed or desired. Someone commented in this thread that it wasn't, i.e., that beaming is preferable for imaging. I have never read evidence to support this, so I assume it is opinion. On the other hand, I have read several studies that suggest constant directivity is desired, especially for timbral accuracy. I think imaging would be improved also, if the off axis response was flat with frequency. Perhaps there is a semantical issue. When we refer to beaming, it is the narrowing of polar response at high frequencies. Perhaps the prior poster I mentioned was referring to the desirability of directional response vs. omnidirectional response with regard to imaging, to have a high direct to reflected sound. While this is desirable, advocates of constant power or directivity maintain that the directional response should be the same at all frequencies, and not become more directional at high frequencies.

Regarding hyper-imaging, I wonder if some desire this to make up for the lack of visual clues. You probably do not notice imaging ability as much when also viewing an event on HT. Also, I wonder if hyper imaging may be an artifact rather than accuracy, similar to that hyper detailed sound one get via a tipped up frequency response or resonance, that gets tiresome after extended listening. I've often thought a blind reviewer would have an innate advantage here. Boy, won't this hijack a thread?!



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