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Old 13th November 2013, 12:45 AM   #1
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Default recreating the magical polar response of a single drive unit FR speaker. Possible?

hi,

Is it at all possible to recreate the beautiful point source polar response of a single drive unit full range speaker using multi way non coaxial approach?
If you think you can do it, how?
This could be the magic that is missing in typical multi way speakers which single driver listeners appreciate. But I'm not sure which pattern is right. Is it down to preference or are there reasons why one is more correct?

lilun
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Old 13th November 2013, 01:50 AM   #2
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Nothing magical about single driver response. More of magic is in imaging perception typical of small single driver system, with moderately good sized sweet spot with stable imaging behavior. This is low diffraction point source behavior. Highly point source behavior is possible for waveguide with very narrow focus, and corresponding changes to. Multiple driver speakers can be made to have very point source behavior, but typical implementations fail, creating multiple sources in crossover region, with diffraction behavior, and this is added to greater diffraction behaviors of baffle system for multiple drivers, and the inherent diffraction behaviors of each driver used in the system. Much of this seems to correlate with decreased imaging specificity with most multiple driver systems over the single drivers system.
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Old 13th November 2013, 02:50 AM   #3
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How would you create a highly point source behaviour with a typical 3 way floor stander? It's more like a line array vertical pole, than a 'point source'. I'm going to stick to believing it can't be done unless someone can prove me wrong.
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Old 13th November 2013, 03:06 AM   #4
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Originally Posted by lilun View Post
Is it at all possible to recreate the beautiful point source polar response of a single drive unit full range speaker using multi way non coaxial approach?
Keep the centre-to-centre spacing to less than 1/4 wavelength of the XO point. The drivers become essentially coincident.

dave
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Old 13th November 2013, 03:23 AM   #5
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Keep the centre-to-centre spacing to less than 1/4 wavelength of the XO point. The drivers become essentially coincident.

dave
hard to do with a 3 way or 4 way. Depends how you define coincident. I don't think its quite the same as an actual single driver. I think our ears can hear it.
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Old 13th November 2013, 03:25 AM   #6
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by lilun View Post
How would you create a highly point source behaviour with a typical 3 way floor stander? It's more like a line array vertical pole, than a 'point source'. I'm going to stick to believing it can't be done unless someone can prove me wrong.
That is exactly what the Danley Synergy 3 way speakers do - use a horn to combine all drivers to a virtual point source. The more difficult thing to achieve is to get all drivers to have a linear phase and aligned in time. Similar is the Unity speaker.
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Old 13th November 2013, 05:40 AM   #7
Juhazi is offline Juhazi  Finland
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Yes Synergy horn would be best. But again, very low F is problem for a horn. Alike they are a problem for fullranges...

"Patrick's" project is interesting! LeCleach-Synergy horn plus bass. Monster Massive
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Old 13th November 2013, 11:27 AM   #8
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Primary directional cues and timbrel cues occur in 500-5kHz range, and control of radiation is most important. Lower frequency sounds have little specificity in our ability to localize. In lower frequency range, standing waves associated with room reflections and room modes. Equalization of room modes to reduce impact is relatively straight forward.

The 1/4 wave guideline is violated by vast majority of multiple driver systems, and also by all larger full range drivers. Large speaker baffles, horn mouths all have impacts. Reflections from inside cabinets back through driver membrane have impact, this encompasses reflections from driver basket and motor structure as well.
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Old 13th November 2013, 09:05 PM   #9
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hi,

Is it at all possible to recreate the beautiful point source polar response of a single drive unit full range speaker using multi way non coaxial approach?
If you think you can do it, how?
Use a giant tweeter. That will get you the "magic" of laser-beam treble like a widebander.
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Old 13th November 2013, 09:20 PM   #10
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That will get you the "magic" of laser-beam treble like a widebander.
Certainly the case for many FRs, but a generalization that is not valid with the best of modern FRs.

dave
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