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-   -   Enclosures made of CARBON FIBER laminates ??? (http://www.diyaudio.com/forums/subwoofers/107231-enclosures-made-carbon-fiber-laminates.html)

JinMTVT 21st August 2007 03:42 AM

Enclosures made of CARBON FIBER laminates ???
 
as i am working with carbon fiber right now for R&D purposes ( structural unidirectional prepeg stuff ..
not fenders and decorative products )

i thought about using some CF prepeg + core sandwiches for enclosure ...
i am pretty sure that i can make an enclosure of regular subwoofer size that will take as much power to flex as a few inches think concrete box would ...

all this for probably 1/10th the weight of the wood box


anyone ever used such material ?

the only drawback i'd see, would be the movement of the box on floor when energized because of it's low weight ???? ( could be overcome by fastening it nah? )

just a quikc thought ...


CF used to be really expensive ... now already make alum or balsa core sandwichs with woven prepeg can be purchased quite cheaply ...

454Casull 21st August 2007 03:54 AM

You can overcome the low mass of such an enclosure by using two drivers in push-pull operation.

planet10 21st August 2007 04:43 AM

Quote:

Originally posted by 454Casull
You can overcome the low mass of such an enclosure by using two drivers in push-pull operation.
They would have to be arranged push-push... (whether the drivers are arranged to do push-pull or not doesn't matter)

Wilson-Benesch have a CF woofer.

dave

JinMTVT 21st August 2007 02:15 PM

clever :)

JinMTVT 21st August 2007 02:20 PM

my Mirage BPS sub is of push-push arrangement ..

i believe that this is a very good design for control ..
but does it work only good at a certain freq depending on the distance from the 2 drivers??or it works at all freq ? is there any disadvantage to push-push ?

planet10 21st August 2007 05:11 PM

Quote:

Originally posted by JinMTVT

but does it work only good at a certain freq depending on the distance from the 2 drivers??or it works at all freq ? is there any disadvantage to push-push ?
Works at all frequencies. Only disadvanatge is you need 2 woofers and have to take a bit more care in the build to maximize the benefit.

dave

Variac 21st August 2007 05:14 PM

CF could probably also work well as a case for a preamp, etc. as it would conduct electricity. So if you grounded it, would be a Faraday cage.. With Neodymium drivers, what a great portable PA it would be!!

JinMTVT 21st August 2007 05:29 PM

nice :)

yes of course, carbon wire is very conductive :)


what is the radiation pattenr of push-push drivers?
i am pretty sure i've seen a few graphs around here,
but i can't remember in wich thread ...


is the radiation affected by the distance between the 2 drivers ??


is guess there is not limit to how many pairs could be used side to side on an enclosure

planet10 21st August 2007 05:58 PM

It is a subwoofer. All subs have an omnidirectional radiation pattern* whether they have 1, 2, or 10 drivers. Doesn't matter what side of the box you put them on either as far as that goes. Within the confines of a house you would be hard pressed to build any practical sub that had the drivers too far apart.

In a push-push sub, maximum benefit is had when the woofers are close coupled, and this is easiest to do if they are in close proximity to each other.

*(not strictly true if one considers dipoles and some of the cardioid pro-subs)

dave

Variac 21st August 2007 06:27 PM

Quote:

now already make alum or balsa core sandwichs with woven prepeg can be purchased quite cheaply
Do you know a source for this stuff?


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