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difference between MDF and glass


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jsesterly 
Member - Posts: 25
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Posted: January 08, 2006 at 1:00 AM / IP Logged  
never really heard a 'glass box compared to one built out of MDF.. how much difference?
jfunk06 
Copper - Posts: 64
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Posted: January 08, 2006 at 10:23 AM / IP Logged  
Glass doesn't sound as good.  MOst people use FB to encorporate a box into the smallest area possible, or to make it look as cool as possiblw.  Thats why when i build a FB enclosure i make sure it has atleast 4 sides out of MDF, because im not a big fan of FG sounds.  Most people probally wouldn't know the diffrence, but i would.  Just a personal prefrence on my part
Govenor of Jimcinati
93' GMC Safari XT
sparkie 
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Posted: January 08, 2006 at 11:55 AM / IP Logged  
A glass box can conform to odd shapes inside a vehicle box and can mould into eleaborate shapes. It does flex and resonate though whereas MDF doesn't really unless you are using 1/2 inch or are pushing some serious SPL. There isn't any difference in terms of sound quality between the two, but there is a difference in terms of the enclsure's ability to affect the sound. If a box resonates and flexes during bass notes it changes the sound. A box made from 3/4 inch MDF and braced properly will generally sound better. Unless you can add sufficient mass and thickness to the walls of a glass box, those weaker areas will alter the box's sound characteristics while playing. A combination of glass and MDF works great when space is minimal and oddly shaped.
sparky
jsesterly 
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Posted: January 08, 2006 at 1:15 PM / IP Logged  
Ahh gotcha. Reason Im asking is I want to make a box in the shape of a spare tire. Now I can cut MDF in a circle 25 times to make the thickness right.. or just make a front, middle, back out of MDF, and glass the rest.. Figured it would be cheaper and easier to just make a front, middle, and rear from MDF and glass the rest.
sparkie 
Platinum - Posts: 2,061
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Posted: January 08, 2006 at 1:28 PM / IP Logged  
You can do it many ways. If you can get some wiggle board it is designed to bend in one direction and will work as the outer ring. I would recomend that you double it up and laminate or glue the two pieces together for strength as the board is usually only 3/8" thick. If you glass the whole thing afterwards it will strengthen the joints that much more.
sparky
ragoal12 
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Posted: January 08, 2006 at 11:24 PM / IP Logged  
well it sounds like you have the right idea as to how u want to do ur enclosure.. and i would do it the same way u r.. make as much of it out of mdf as you can.. only FG what you have to ... the work will go alot quicker, its cheaper, and you don't have to worry about getting the FG thick enough..
S.O.B custsoms.. South Omaha, Nebraska
jfunk06 
Copper - Posts: 64
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Posted: January 09, 2006 at 5:08 PM / IP Logged  
The only part i would worry about using MDF with, is the top.  The rest will have enough support due to the well surround, so i wouldn't worry about using MDF there. 
Govenor of Jimcinati
93' GMC Safari XT
jsesterly 
Member - Posts: 25
Member spacespace
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Posted: January 10, 2006 at 8:38 AM / IP Logged  

[QUOTE=sparkie] wiggle board QUOTE]

What the heck is wiggle board? I thought about cutting the MDF in sections making it easier to "wrap" it around the sides.. having had the time to try it yet.

mi_what 
Copper - Posts: 208
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Joined: April 20, 2005
Location: United States
Posted: January 12, 2006 at 2:45 PM / IP Logged  
cutout a circle of MDF for the bottom, get flexible plywood (I think is what he meant by wiggle board) wrap it around the inside, lay glass down around the edges of the bottom (connecting it to the MDF) then just start your sub. for extra strength you could double the inside, or just add a layer or two of glass to the inside.

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