In controlled measurements in an ideal room, the concentric drivers, well placed on a suitable enclosure, should prevail, by at least a tiny margin. There are so many compromises made in designing a loudspeaker that I doubt the single point source concept outweighs all the rest. Especially the aspects that affect external looks, seem to more follow a fashion trend or wife acceptance criteria rather than solid engineering findings. Allowing for the technical solutions that have become obsolete or superseded by others, I find that many or most manufacturers of loudspeakers don't really use all of that expertise in their products. There has been a lot of research and a lot of expertise has been gathered over the past several decades. Problems including diffraction and directivity maladies due to the mid range surround affecting the tweeter's low end response made them introduce the uni-q in the entry level models rather than the reference. The midrange as well had to use a stronger magnet as it lost the core material.Īccording to KEF as well, it took them several generations to make coaxials sound good.
#TANNOY DUAL CONCENTRIC POLE PIECE DRIVERS#
If they had a sales organization as effective as Bose or Klipsch, in older times until now- we'd likely see Tannoys all over the place, IMHO.Īccording to KEF, concentric drivers were not viable until neodymium became available as magnet material, offering strong but tiny magnets for the tweeter that needs to be tiny to fit within the midrange's voice coil area. It's just that, IME, the fact that Tannoy can't market or distribute their way out of the proverbial paper bag- that is why they're not any more popular than they are. That said- IMHO- Tannoys from the 1990s and newer (from the time of the Churchill Wideband and beyond)- they have seemed to consistently get everything pretty much right. And even there, there's some "quirks" about them (primarily small response deviations from flat response), that can make them not match what some people want to hear. Tannoy, IMHO, is about the only people who have reliably "gotten it right". Many fail the second (forcing the woofer to go too high in frequency, and/or rolling off in the top octave badly, which can result in harsh and/or dull soud), and even more fail the third (the tweeter gives up when asked to provide life-like transients). Dual concentrics are harder to do well than other designs- primarily, due to the difficulty of building a concentric tweeter that will simultaneously fit, cover the needed frequency range (from below 1KHz to above 20KHz, ideally), and handle the dynamics and max output level correctly.
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