Enclosures made of CARBON FIBER laminates ??? - diyAudio
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Old 21st August 2007, 04:42 AM   #1
JinMTVT is offline JinMTVT  Canada
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Default 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 ...
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Old 21st August 2007, 04:54 AM   #2
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You can overcome the low mass of such an enclosure by using two drivers in push-pull operation.
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Old 21st August 2007, 05:43 AM   #3
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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.

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Old 21st August 2007, 03:15 PM   #4
JinMTVT is offline JinMTVT  Canada
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clever
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Old 21st August 2007, 03:20 PM   #5
JinMTVT is offline JinMTVT  Canada
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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 ?
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Old 21st August 2007, 06:11 PM   #6
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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.

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Old 21st August 2007, 06:14 PM   #7
Variac is offline Variac  United States
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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!!
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Old 21st August 2007, 06:29 PM   #8
JinMTVT is offline JinMTVT  Canada
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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
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Old 21st August 2007, 06:58 PM   #9
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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)

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Old 21st August 2007, 07:27 PM   #10
Variac is offline Variac  United States
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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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