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Old 4th July 2009, 15:15   #1
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Default Fiberglass Vs Mdf Enclosure

Guys when constructing a sub enclosure there are two options for it-Mdf or fiberglass.Which is a better option SQ wise?
I have always considered Mdf to be a better material.
The only advantage of fiberglass according to me would be the option of constructing it the desired shape.
Another thing that has troubled my mind is that how does one determine the volume of enclosures like the following-
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Old 4th July 2009, 16:20   #2
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Using marbles. We can create a cardboard box with the desired volume then fill it up with marbles. Then we can fill the FG enclosure and see if its same.
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Old 4th July 2009, 16:46   #3
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Put some gel coat on the mdf rings and spacers first. Then pour water from a can. I use a 5L can and 1L can. 28L = 1Cu Ft.
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Old 4th July 2009, 17:08   #4
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See this

Starting Fiberglass sub box! - MP3Car.com
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Old 4th July 2009, 18:31   #5
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Thanks for the link.
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Old 4th July 2009, 19:39   #6
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You need to exclude the volume occupied by the sub cone itself
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Old 4th July 2009, 23:49   #7
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I think a box which has flat sides would be better for the working of the sub.
Gurus would know better.
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Old 4th July 2009, 23:53   #8
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fiberglass needs a form for the mould. One option is to make this form out of very thin MDF (say 6mm) and let the form adhere to the resin. hence you will get a composite box (6mm mdf + 3mm FRP).

you can use marbles or water but I prefer sand. I have access to dry sand (because on the machines I work with is a water jet) so it is easy. marbles or water will do just fine.

sand density is 1.6, water is 1. I assume marbles will be around 1.6-2.
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Old 5th July 2009, 09:47   #9
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Quote:
Originally Posted by abhinav.gupta88 View Post
I think a box which has flat sides would be better for the working of the sub. ...
No, doesn't play any role. The rear wall should be at a decent distance from the back of the magnet not to constrict VC cooling.

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Originally Posted by navin View Post
... I have access to dry sand (because on the machines that I work with is a water jet). ...
A-ha!?!?
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Old 5th July 2009, 11:29   #10
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Quote:
Originally Posted by DerAlte View Post
A-ha!?!?
DA it is something like this
Water Jet Cutter and Abrasive Waterjet Machine Manufacturer -- waterjet cutting machine and water jet cutting spare parts

the machine spits out a mix of sand (that must be clean and dry) and water.

The spill off is treated and the sand reused.
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Old 5th July 2009, 13:12   #11
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I know, Navin Was just joking about dry sand with water jet sounding like an oxymoron! If we try pumping the sand and water as a slurry, the pipes wouldn't last 5 minutes, so the slurry is made outside the nozzles. Nifty trick!
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Old 5th July 2009, 16:00   #12
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For minute there the "confused" smiley lead me to believe that you actually were. :-)
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Old 29th April 2011, 14:29   #13
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Default Re: Fiberglass Vs Mdf Enclosure

Quote:
Originally Posted by navin View Post
fiberglass needs a form for the mould. One option is to make this form out of very thin MDF (say 6mm) and let the form adhere to the resin. hence you will get a composite box (6mm mdf + 3mm FRP).

you can use marbles or water but I prefer sand. I have access to dry sand (because on the machines I work with is a water jet) so it is easy. marbles or water will do just fine.

sand density is 1.6, water is 1. I assume marbles will be around 1.6-2.
I know this is a old post, but relates to what i want to know.
How do we combine MDF and FRP, i saw another one of your post's saying to use Marine grade plywood sandwiched between FRP, how do we make those, like AFAIK mdf will not be flexible enough. Please shed some light
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Old 29th April 2011, 18:16   #14
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Default Re: Fiberglass Vs Mdf Enclosure

Quote:
Originally Posted by yashshroff View Post
I know this is a old post, but relates to what i want to know.
How do we combine MDF and FRP, i saw another one of your post's saying to use Marine grade plywood sandwiched between FRP, how do we make those, like AFAIK mdf will not be flexible enough. Please shed some light
Sorry to be posting againn !!... does it mean to use MDF on front with driver cutout and fg for back mould ?
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