Whizzer Thread

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kach22i

kach22i

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Joined 2009
kachadoorian.com/
#1
I want to try and make my own whizzer.

I searched for a good Whizzer thread, found mention of making one out of "sugar paper". Then when I went to start this thread found a five year old thread which did not show up in prior searches.

Whizzer patent:
http://www.diyaudio.com/forums/full-range/90005-whizzer-patent.html

I found this great image, goes with a pretty good article.

OrdinaThor_Loudspeakers_Fullranger Requirements - fullrange speakers, horn, high efficiency, tqwt, multiple arrays, general audio topics>
res_treat_01.jpg


Once you get the whizzer to work, seems the next problem is diffusing it directivity.

Bright idea?
Humble Homemade Hifi
An externally hosted image should be here but it was not working when we last tested it.


A patch solution?
Weber Beam Blocker -- high frequency diffuser
An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.


The various slotted phaseplugs are interesting but they do not apply to this topic, or do they?

I might apply a whizzer to a carbon fiber driver/speaker. To go from hard and stiff at the center to softer at the ends of the flute could be as easy as where I do and don't apply resin to when forming the part. For instance if the upper outer ring whizzer underside is left uncoated with resin and is bare cloth, then it would be "soft" as in the diagram with the black background (see far above). The base root of the whizzer would receive more coats than other areas, making it stiffer and yes heavier than other areas.

I have no idea how to make a fluted cone shape without cutting the fiberglass or kevlar/carbon fiber cloth. Is there a cloth compliant enough to make this shape? Do I need to lathe a wood master mold or can I just carve up some foam?

Can I just buy a whizzer and resin/dope it myself? I've searched but have found no whizzer retailers.
 
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#4
hm said:
Hello,
this would be a diffusor
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I saw that image while doing my research, thought it was just a weird looking phaseplug.

I've done a couple dozen sketches this morning, woke up with a bunch of ideas. I'm considering forming an offset second dome over the dustcap made of light weight brass, copper or aluminum mesh screen (like they wrap around glass candle holders). I could form it over a tea cup bottom or something and then superglue it to the driver center.

My thinking is that all the tiny wires which compose the mesh will vibrate at very high frequencies. And although the dome shape may lend to a half sphere wave front I also plan on using a suspended diffuser. I've used a golf ball - dimples and all as a tweeter diffuser before and I liked the results. In fact the way I had it secured allowed the ball to spin on deep passages which was quite entertaining as well as being a 2-channel bass separation indicator.
 
#7
hm said:
Hobby Hifi 01 Jan 2002
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I actually have not seen or heard that speaker before. Lowther - yes, that particular Lowther-no.

Lowther America Prices
The new standard plug, called the Phase Equalizer plug, but commonly called the holey doorknob or showerhead plug, is designed to load the whizzer cone in addition to preventing cancellation of certain tones. It has the effect of flattening frequency response, but does make the highs very directional. So you must point the speakers at your ears when you listen when using these plugs.
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From the sounds of it; whizzers, phaseplugs, Beam-Blockers, and dust caps all deal in one way or another with the high frequencies coming out of the middle of the driver.

I have yet to find a good article, website or Blog showing experiments with different materials and shapes of whizzers or dust caps.

If you find one please provide a link.🙂

EDIT-1: I've found some regular dust-caps;
Simply Speakers - Quality Parts and Service

EDIT-2: This is interesting.
Pioneer Replacement Speaker Parts / Drivers / Spars for Vintage Pioneer Speakers.
Pioneer_CS-77_Woofer_Vented_web.jpg


EDIT-3: A splash of color
Dust Cap-China Electronic and Digital Products Wholesale Center.
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EDIT-4: Somewhere, not sure where.
: Sports Linkup Shop :
140.jpg


EDIT-5:
Products
We are the largest suppliers in the US of custom designed cones and dust caps.
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#9
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#11
I've found something similar to what I want to try. Already picked up the supplies earlier today. The chart in the link says the red line is with dust cap removed, does not say with the screen mesh also installed - do I assume so? If so then the screen/mesh does not resonate into higher frequencies as I would have thought. I'll try my own experiments despite this find.

Supravox 215GMFHow to tweak this driver to better performance
Supravox-215GMF_7_dust-cap_250pxH.jpg


Another vented phase plug: Alpine SPX-17PRO
http://www.onestopcaraudio.co.uk/products_all.html?page=12&disp_order=1
An externally hosted image should be here but it was not working when we last tested it.


Gold:
http://taweber.powweb.com/weber/h_dustcap_exp.html
An externally hosted image should be here but it was not working when we last tested it.

What is an 'H' dustcap?

The term "dustcap" refers to the small dome-shaped part of the speaker in the very center of the cone. The dome is there primarily to keep dust and debris out of the speaker's voice coil gap, but a secondary function is how it affects the high frequency response. For typical guitar speakers, we have chosen the standard dome that makes the most musical sense, as well as preserving vintage characteristics.

Sometimes a player will want a speaker with a diffused or reduced high frequency response. For this purpose, some speakers may be ordered with the 'H' dustcap. This is especially true of harmonica players, who want to reduce the high end to help prevent feedback and abusive tones. Hence the designation 'H'
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#12
#15
Excuse my noobish-ness but why do you want to add a whizzer to your driver? From what I gather, most dislike them for their "shout" and some people even go as far as to amputate them...
 
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#16
FE167E?????????????????????? I was just reading somwhere that the space where the phase plug has to be to stop peaking. Here is a neat speaker project for some ideas. I have been interesting in building a speaker cone. Not come up with any idea for meterials yet. Going to cut some paper roll surrounds of some german radio drivers that have dried unevenly cause 2 different compliance rates and replace them with chamios for starters. There is two uber knollege bases for speaker building both difficult to access. A club bassed around rullit and the japanese fullrange club of which yamoto is a student.

Atelier Rullit projects This guys inspired me to have a go. Plently of whizzers to check out and nice cones too.
 
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