Whizzer Thread

[kach22i]

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:
Whizzer patent...

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>


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

Bright idea?
Humble Homemade Hifi


A patch solution?
Weber Beam Blocker -- high frequency diffuser



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.

[jimbro]

You could buy a cheap speaker with a whizzer and cut it off but unless you can find detailed drawings, or measure it before buying, it would be tricky getting one of the right diameter.

[hm]

Hello,
this would be a diffusor

[kach22i]

Originally Posted by hm

Hello,
this would be a diffusor

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.

[hm]

Hello,
do you made measurements?
as the name says it is more a beam blocker no diffusor, think about the wave length,
reflexions etc.
here Lowther diffusor measurements, without the best?
Hobby Hifi 01 Jan 2002

Wiki: Phaseplugs
Phase-Plug ? Wikipedia german

[planet10]

Originally Posted by kach22i

I saw that image while doing my research, thought it was just a weird looking phaseplug.

Actually all phase plugs are diffusors (except for real phase plugs which are found in compression drivers to reduce and control the volume in front of the diaphram before it loads into the horn.

dave

[kach22i]

Originally Posted by hm

Hobby Hifi 01 Jan 2002

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.

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.


EDIT-3: A splash of color
Dust Cap-China Electronic and Digital Products Wholesale Center.


EDIT-4: Somewhere, not sure where.
: Sports Linkup Shop :


EDIT-5:
Products

We are the largest suppliers in the US of custom designed cones and dust caps.

[kach22i]

I've found the Braveheart of DIY driver modification.
Tannoy III LZ,

Yes, the dust cap has been removed and now the driver looks like this:



Beer or beer cans makes everything sound better.
Tannoy III LZ,



EDIT: lug slug woofer rattle...........serious surgery
Model 19 woofer rattle

[kach22i]

Notches
Dynaudio Owner's Thread - Page 148 - AVS Forum


Homebrew - Trod93
http://www.wiredstate.com/forum/view...20917&start=40

Sony 4" full-range driver with a home-brewed whizzer cone. The whizzer cones extended the highs.

I wonder how the protective mesh over this tweeter affects the sound.
http://www.wiredstate.com/forum/view...20917&start=60

[kach22i]

Eton's "Heat Pipe" is a vented phaseplug, right?

https://www.madisound.com/store/prod...roducts_id=233


This one is clearly marked "phase Plug".
https://www.madisound.com/store/prod...oducts_id=8515