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Multi-Way Conventional loudspeakers with crossovers

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Old 22nd September 2012, 08:00 AM   #51
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Quote:
Originally Posted by a_tewinkel View Post
Hi guys,

I'm trying to understand how the Danley GH60 works. This thread has been very helpful.

I think I understand how the Shaded Amplitude Lens works.

I get the basic idea behind the Paraline as well, I think. Is it correct that the amplitude of the wave front that exits a Paraline (with two narrow exit slots) is lower in the centre (between the two slots) than at the centre of the individual slots? I'm trying to figure out what the advantage is of putting a Paraline behind the Shaded Amplitude Lens; so far I seem to be neglecting something I think? Or is the Paraline simply a way to combine multiple compression drivers?
A Paraline uses a single exit slot, multiple driver Paralines have the single slot stacked vertically.
The amplitude of the wave front that exits a Paraline is equal from top to bottom, which is why it works well in both a line array or a single horn such as the GH60.
The Shaded Amplitude Lens redirects a small portion of the output of multiple driver Paralines downward at a reduced level to compensate for the inverse distance law.
It appears DSL has abandoned this approach in the larger scale Biblical named units and may be using "astigmatic" Paralines instead to provide a controlled variable vertical dispersion, reducing the parts count and build difficulty and reducing diffraction effects.

Art
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Old 15th October 2012, 02:13 PM   #52
stewin is offline stewin  Kenya
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hi guys . just wondering , since paraline loading is very effecient in hf drivers.

>>>> can paraline loading be used in unity horn or synergy horn tweeters like in danleys gh60 .
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Old 15th October 2012, 04:07 PM   #53
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Originally Posted by stewin View Post
hi guys . just wondering , since paraline loading is very effecient in hf drivers.

>>>> can paraline loading be used in unity horn or synergy horn tweeters like in danleys gh60 .
Posting the same question in three threads is bad form.
Paraline loading is no more efficient than a conical horn.

The purpose of a Paraline is to reduce vertical dispersion to only a few degrees without requiring a long throat, not what one normally wants in a Unity/Synergy horn.

Paralines are useful for combining HF driver output, a home use Unity/Synergy only needs one HF driver, a Paraline increases the build complexity, and makes the frequency response more ragged.
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Old 16th October 2012, 05:05 AM   #54
stewin is offline stewin  Kenya
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thanks welter i much appreciated reply.
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Old 6th March 2014, 06:00 PM   #55
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Click the image to open in full size.

Click the image to open in full size.

I made some animations using Xara and Hornresp to illustrate how the lens in the Beolab works. Same idea applied to the Paraline. It's interesting to watch the spherical wave get "bent" into a flat wave. But you can also see that the process is not perfect, and that's probably why the high frequency response of both devices has narrow peaks and dips.

Is that audible? It's open to debate.

More musings here:

bang and olufsen tweeter lens idea - Car Audio | DiyMobileAudio.com | Car Stereo Forum
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Old 6th March 2014, 10:20 PM   #56
soongsc is offline soongsc  Taiwan
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Nice for a super tweeter.
Probably would be better with a parabolic curve with source at the focal point.
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Old 6th March 2014, 11:04 PM   #57
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I may not have made it clear, but both the Paraline and the Beolab lens use virtually the same curve and work virtually the same way. Both take a point source with wide directivity and turn it into a line source with narrow vertical directivity.

Click the image to open in full size.
This is a Paraline, with tweeter in the center

Click the image to open in full size.
This is a Beolab, with a tweeter in the center

Click the image to open in full size.
Here's both, overlaid. See how it's the same curve?
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Old 6th March 2014, 11:28 PM   #58
soongsc is offline soongsc  Taiwan
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If you consider ideal point source, then the curve is a parabola. Same as the early flashlights. In reality, you almost never have an ideal enough point source in speaker drivers.
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Old 7th March 2014, 12:59 AM   #59
gedlee is offline gedlee  United States
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Quote:
Originally Posted by soongsc View Post
Nice for a super tweeter.
Probably would be better with a parabolic curve with source at the focal point.
Here is a radical idea - why not use a contoured waveguide over the source to create the desired wavefront without any reflections or diffraction. That might work well.

WAIT! I just remembered, it does work well. Who'd have guessed!
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Old 7th March 2014, 01:13 AM   #60
soongsc is offline soongsc  Taiwan
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Direct sound radiation seems to always provide the best reproduction, reflection always result in a maze of interacting waves which kind of fuzzies the sound, works well if you consider other considerations such as looks. It is only a matter how to sacrifice the lease to get the looks you want and the cost involved. The simplerer and cleaner the shape contour, the more sound you preserve.

I tried the concept.
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