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In Reply to: RE: You impressions of single-driver speakers? posted by genungo on August 24, 2014 at 11:30:02
My speakers are not high-efficiency, but they have a point-source midrange/tweeter that operates from 300-Hz to 26-kHz. I don't know the crossover point from midrange to tweeter, but all crossover slopes are 6-dB/octave and they supposedly produce linear phase to ±10-degrees. The crossover from midrange to woofer is 300-Hz. These speakers are very realistic in the midrange with surprisingly smooth highs. They are somewhat lacking in deep bass, though, so I use a subwoofer. The impedance curve is amazingly flat at 3-ohms ±0.5-ohms from 60-Hz to over 20-kHz. However, they are not very efficient at about 86-dB SPL for 1-watt at 1-meter.
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Your comments on coaxial drivers reminded me of a very old and interesting coaxial, the Hartley 220 MS 10 inch driver, claimed response 32 to 20 KHz, still being made. They go back to at least the 60s and yet use a non-paper construction. Highs are handled by a decoupled dust cap with a shorting ring. The crossover is mechanical and the shorting ring is powered by the same magnet as the main cone. And most interesting is their magnetic suspension. The driver uses an iron ring on the voice coil to keep the voice coil centered. When it's not centered the unequal magnetic forces on the ring bring it back to center.
Edits: 08/25/14
Your response piqued my interest and I found a description of the Hartley 220 MS 10 inch driver in what appears to have been an auction.
Coaxial drivers such as yours or the ones used by KEF and others can produce very nice results, that's for sure. I like them.The whizzer cones used in many single-driver designs are generally not as smooth sounding as true tweeters are, but coaxials like yours are usually much less efficient than true single-driver designs are. As a compromise, I think that the "augmented single-driver" (what I call "hybrid single-driver") design is most appealing.
Edits: 08/25/14 08/25/14
I'll second that. I let my first pair go to a friend who was just getting into the hobby. I may have to buy another pair of M's (or maybe the Lores) someday so I can enjoy the flavor of a truly efficient speaker again.
Sorry genungo. Meant that to be posted under your M-Lore comment.
No offense taken.
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