Join Date: Jan 2003
Location: Los Angeles, CA
Mentioned: 24 Post(s)
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Revel Performa Be F228Be, M126Be and Performa F208
There is visual confusion when trying to evaluate the listening window curve that lies on top of the much less valuable on-axis curve. Therefore, I have attached the F228Be Listening Window curve by itself, which is extremely good. I have also attached the Performa F208 Listening Window along with the Performa F228Be listening window, allowing a much easier visual comparison. As our research has long indicated, the listening window is a far better indicator of direct sound quality than is any on-axis curve. On-axis curves measured from just slightly different microphone locations will yield different results at high frequencies due to trivial local diffraction, making them misleading. The listening window greatly mitigates this problem.
Please note that these curves are not just a new format, but have been made with an entirely new measurement system, using the Klippel Analyzer, along with an updated anechoic chamber LF calibration. Therefore, these updated measurements, done with the same system, allow for valid comparisons. It is clear from these curves that the LF amplitude response is the same for both the F208 and F228Be. (Thank you to Mark Glazer for late Friday night work on these!)
As has been noted, the F228Be directivity curves are just sensational, which has been proven to be critically important in countless double-blind listening tests, and in the field. Harman researcher's work on the importance of first reflections--especially the side walls--proved that the speaker's output that contributes to these critical first reflections is as important as the direct sound. The radiation of the F228Be that contributes this reflected output matches that of the listening window extremely well, enhancing both the remarkably uncolored sound quality of the F228Be, and also results in the seamlessness of the transition from the midrange to the tweeter that is rarely found with any speaker, regardless of price. That seamlessness is a big part of making music sound real, rather than sounding like a mechanical facsimile. I have never heard a multi-driver speaker that achieves seamlessness without a properly designed waveguide.