Enclosures made of CARBON FIBER laminates ???

JinMTVT · 21st August 2007, 03:42 AM

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?

21st August 2007, 03:42 AM	#1
JinMTVT diyAudio Member Join Date: Jul 2004 Location: MTL	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 ...

21st August 2007, 05:14 PM	#7
Variac diyAudio Editor Join Date: Dec 2001 Location: San Francisco, USA	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!! __________________ Burning Amp Festival Sunday, October 28th, 2012 in S.F. We need Volunteers & sign-up's for what you're bringing!

21st August 2007, 05:58 PM	#9
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	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 __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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21st August 2007, 03:54 AM	#2
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	You can overcome the low mass of such an enclosure by using two drivers in push-pull operation.

21st August 2007, 02:15 PM	#4
JinMTVT diyAudio Member Join Date: Jul 2004 Location: MTL	clever

21st August 2007, 02:20 PM	#5
JinMTVT diyAudio Member Join Date: Jul 2004 Location: MTL	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 ?

21st August 2007, 05:29 PM	#8
JinMTVT diyAudio Member Join Date: Jul 2004 Location: MTL	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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