I have never seen the magnet structure of the BD4. Can you show it, eventually compared to BD3 ?
Magnet looks ordinary, just slightly bigger, but my feeling during transportation, that it creates stronger magnet field than huge GOTO drivers.
Why not to consider voice coil as ribbon ? What is the difference ? 🙂
I don't need AER to play lower that 500hz, so I don't need baffle.
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Thanks Heaven !!
Angelo: Thank you for that. There is soooooooooooo much misconception
about open baffle, that it is ridiculous !! I have even read on a forum where a member says:
"only an open baffle works for bass. How can you get bass when it's trapped in a box?"
(and he was dead serious)
Angelo: Thank you for that. There is soooooooooooo much misconception
about open baffle, that it is ridiculous !! I have even read on a forum where a member says:
"only an open baffle works for bass. How can you get bass when it's trapped in a box?"
(and he was dead serious)
A baffle is not mandatory for this application. I don't see a problem with what is being proposed provided the design accounts for it. Am I missing something?
Nomenclature!
All horns are baffles but not all baffles are horns and you may combine a flat one with a horn in some cases to an acoustical advantage. WHG
All horns are baffles but not all baffles are horns and you may combine a flat one with a horn in some cases to an acoustical advantage. WHG
Back in message #334 Peter said (concerning AMTs):
"I hope to try out the new ones (4 in a straight line [2 in parallel, 2 in series] achieving a 98 dB/1w - 4 Ohm sensitivity) at some point in the winter to come."
Let me caution that you are dealing with slotted aperture drivers (describes AMTs, ribbons, etc.) which have limited vertical dispersion. Thus an array of such drivers will not have overlapping vertical gain across the frequency band. In fact the vertical dispersion will trend toward the height of the aperture at the upper end of the frequency band (thus no vertical gain over an individual driver at the upper frequency extreme). As an example you can see this behavior in the plots for a Munford AMT at:
https://www.madisoundspeakerstore.c...dorf-amt27d1.1-dipole-air-motion-tweeter-amt/
Bottom line is don't count on significant arrayed gain with AMT drivers. You should take some measurements to assess your overall sensitivity.
"I hope to try out the new ones (4 in a straight line [2 in parallel, 2 in series] achieving a 98 dB/1w - 4 Ohm sensitivity) at some point in the winter to come."
Let me caution that you are dealing with slotted aperture drivers (describes AMTs, ribbons, etc.) which have limited vertical dispersion. Thus an array of such drivers will not have overlapping vertical gain across the frequency band. In fact the vertical dispersion will trend toward the height of the aperture at the upper end of the frequency band (thus no vertical gain over an individual driver at the upper frequency extreme). As an example you can see this behavior in the plots for a Munford AMT at:
https://www.madisoundspeakerstore.c...dorf-amt27d1.1-dipole-air-motion-tweeter-amt/
Bottom line is don't count on significant arrayed gain with AMT drivers. You should take some measurements to assess your overall sensitivity.
Hi Jim,
Thanks a lot for pointing this out. There should be sufficient headroom anyway, though, as power handling is increased 4 times.
Best regards
Peter
Thanks a lot for pointing this out. There should be sufficient headroom anyway, though, as power handling is increased 4 times.
Best regards
Peter
“Every act of perception, is to some degree an act of creation, and every act of memory is to some degree an act of imagination.”
Oliver Wolf Sacks
True! What I want is to get 500hz with smallest possible diameter around AER. I don't want large reflection surface around driver, but I need to disconnect front wave from back wave to get lower range, so best idea I can see is using LeCleach profile.
Something like this:
Ok, let's consider the process in details 🙂
What is the difference between ribbon and voice coil wire ?
Why voice coil wire can't produce HF in magnetic field same as ribbon tweeter ?
Moreother...I did one experiment: I've changed AER magnet to Wolf Langa field coil and HF disappeared. Now I know that it is because AER magnet has proper back chamber for HF horn ribbon tweeter! This is really genius solution!
I guess they just close off the gap and dont ventilate into the magnet housing, very common in old alnico drivers of the past 🙂
With a bit of luck this will boost HF a few dBs.
BR,
Anders