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Multi-Way Conventional loudspeakers with crossovers

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Old 2nd April 2013, 11:31 AM   #191
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Why not a leather surround like oldschool and Rullits FR?
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Old 2nd April 2013, 03:28 PM   #192
JMFahey is offline JMFahey  Argentina
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Murphy's Law states that the best leather for surrounds comes from an endangered species or something
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Old 2nd April 2013, 05:42 PM   #193
Frank40 is offline Frank40  Denmark
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Quote:
Originally Posted by DYNABLASTERTUNERS View Post
Why not a leather surround like oldschool and Rullits FR?


I can only speak for my self, but I have three reasons. One is leather is not a light material, second I have no idea how to make a leather surrounding.... But I think my unit will end up without any surroundings at all. I would think it will end up looking something like the picture.

Take care
Frank
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Old 2nd April 2013, 06:07 PM   #194
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Leather if thin is lighter then rubber I think... It's easy to make, but flat, that means less xmax...

That without surround is like Fostex SLE woofers
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Old 3rd April 2013, 07:40 AM   #195
hajj is offline hajj  Lebanon
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Quote:
Originally Posted by Frank40 View Post
I can only speak for my self, but I have three reasons. One is leather is not a light material, second I have no idea how to make a leather surrounding.... But I think my unit will end up without any surroundings at all. I would think it will end up looking something like the picture.

Take care
Frank
Interesting design.

But makes one wonder, how would you guarantee an airtight fit between the cone and the surround without having any friction or "stiction" between cone and surround? Such a design would call for extremely tight tolerances and even then, I'm not sure how airtight the fit would be.
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Old 3rd April 2013, 09:03 AM   #196
Hentai is offline Hentai  Romania
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Leather surrounds... of course it could be tried. For large diameter horn loaded driver low xmax might not be an incovenient even tho i would like to have it and not need it than need it and not have it.
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Old 3rd April 2013, 10:12 PM   #197
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Quote:
Originally Posted by Frank40 View Post
I can only speak for my self, but I have three reasons. One is leather is not a light material, second I have no idea how to make a leather surrounding.... But I think my unit will end up without any surroundings at all. I would think it will end up looking something like the picture.

Take care
Frank
This is exactly what i am trying to build. But also without the spider. No resonance freq. from the surround and spider. Non lineairity compensation with em suspension, designed till p-p 8mm. I am affraid for the break up nodes of the cone withoud surrounding. I read your findings and these from hentai with great interest, a lot of things are interesting. Question: 4.5gr extra mass (second coil) for extra 10Tm till a total of 20Tm. better or not better for higher freq output due to higher mass? Re drops from 6.5 to 3.2ohm in parallel
For now cone is too heavy i think (20gr). for mid-bass? Hopefully the high flux density would compensate, not sure.

compact high effecientie tripple magnet.jpg
bl-x.JPG
X-I.JPG

cheers

Last edited by Jef Nuyts; 3rd April 2013 at 10:32 PM.
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Old 4th April 2013, 10:11 AM   #198
Hentai is offline Hentai  Romania
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Very interesting Jef.
Extra mass is always bad high frequency. Increased BL will give you a bell shaped response between 1khz-4khz as i noticed. You also gain on efficiency with the lower Re so all in all it might be worth while. High flux can compensate high mass but not on the entire bandwidth. Being in parallel the second inductance shouldn't cause much problems.

There is also an aspect regarding cone mass and voice coil mass. There are some effects going on in the 3 cases when one is bigger than the other and when they are equal. If cone is much heavier than voice coil a small mass added by the extra coil will be negligible compared to the BL boost.
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Old 4th April 2013, 07:40 PM   #199
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Goat Leather.

The Voxativ AC-3B is a very well constructed, very expensive 8" full'ish range speaker from Germany.


The suspension material is now a very fine goat leather. As a natural substance it has much better acoustic properties in comparison to foam or rubber. It reduces the internal friction considerably so that the saved energy is now fully transformed in cone movement and impulse reproduction.
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Voxativ also offers several foam surround suspension material speakers. Several different motors using NdFeB disks, NdFeB radials, and ceramic disk materials are available.

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Wide bandwidth 8" speakers can cover the 80-1100Hz vocal range with modest challenges in beaming and Center-to-Center lobing at the crossover. I think phase plugs mainly make sense on 7" to 10" midbass speakers to slightly extend the usable frequency range for a smooth tweeter Xover.
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Old 4th April 2013, 07:54 PM   #200
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Hello all.
Just a thought: has a surround of cloth been given serious consideration? The characteristics of behavior in a cloth surround could be easily adjusted to suit the application by the implementation of various treatments of whatever impregnations or surface coatings (on the one hand). In the other hand, there are the endless options of fibers to choose from, both natural and manufactured. If I dare give a specific recommendation for your consideration regarding the choice of fiber, it would be silk: thin, lightweight, incredibly strong, incredibly fatigue resistant, easy enough to impregnate to suit whatever desired damping characteristics (and would still be light), and also would exhibit a low friction through excursion.
Regards - Aubrey
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