Weight- Fiberglass vs MDF sub boxes
10-06-2005, 11:31 AM
#1
Guinea Pig
Thread Starter
Weight- Fiberglass vs MDF sub boxes
I have been wondering for some time now the weight difference between the 2 and decided to go ahead and run the test last night after being inspired by the "how to drop weight" thread. Here are the results!
Boxes in test
Q-Logic QB-112.3 12-inch Single Bandpass Subwoofer Box loaded with a Lightning Audio 12" 300-Watt Subwoofer, P3.12.4
40lbs even!
VS
CJams (backyard) Fiberglass sub-box loaded with an Alpine SWE-1242 TYPE E 12in 4-ohm Subwoofer
23.6lbs!
I weighed the lightning audio in at 7.4lbs, but the online specs say it's 20lbs shipping. But I didn't weigh the Alpine.
Results: Fiberglass box is 16.6lbs lighter loaded!
Unfortunately my curiosity got the best of me after buying the bathroom scale that calculates body fat
Boxes in test
Q-Logic QB-112.3 12-inch Single Bandpass Subwoofer Box loaded with a Lightning Audio 12" 300-Watt Subwoofer, P3.12.4
40lbs even!
VS
CJams (backyard) Fiberglass sub-box loaded with an Alpine SWE-1242 TYPE E 12in 4-ohm Subwoofer
23.6lbs!
I weighed the lightning audio in at 7.4lbs, but the online specs say it's 20lbs shipping. But I didn't weigh the Alpine.
Results: Fiberglass box is 16.6lbs lighter loaded!
Unfortunately my curiosity got the best of me after buying the bathroom scale that calculates body fat
.....
.......
10-06-2005, 12:33 PM
#3
Racer
iTrader: (1)
Join Date: Sep 2005
Location: Little Rock, Arkansas
Age: 42
Posts: 408
Likes: 0
Received 0 Likes
on
0 Posts
Not really the best comparison since you using a bandpass box vs a sealed box and they aren't even close to the same size. Btw my box weighs about 65 lbs loaded and its a single 10".
10-06-2005, 12:49 PM
#4
Guinea Pig
Thread Starter
Originally Posted by JoeC1982
Not really the best comparison since you using a bandpass box vs a sealed box and they aren't even close to the same size. Btw my box weighs about 65 lbs loaded and its a single 10".
And btw- the boxes are very close in size, the pic is 2 dimensional so you can't see the rear of the fiberglass box. It's a good comparison for weight, but not for sound.
10-06-2005, 01:27 PM
#5
Racer
iTrader: (1)
Join Date: Sep 2005
Location: Little Rock, Arkansas
Age: 42
Posts: 408
Likes: 0
Received 0 Likes
on
0 Posts
I'm not saying that fiberglass isn't lighter its just that in a comparison you should use the same style and size box and probably weigh without the speakers too.
10-06-2005, 09:52 PM
#7
A little more info of limited value for this thread:
the 3/4" MDF I used for some stuff was roughly 9.88 g/in^2. So, that would make a 14" x 14" panel (by my crude measurements) approximately 4 1/4 lbs, which doesn't seem to be far off.
Anyway, fiberglass has a higher strength to weight ratio, but I don't know about the density and since resin & mat use vary from person to person you couldn't give one number. But without the same perimeter, wall thickness, and internal volume, a direct comparison it of no real value. But yeah, almost always a glass box will be significantly lighter than an MDF one.
the 3/4" MDF I used for some stuff was roughly 9.88 g/in^2. So, that would make a 14" x 14" panel (by my crude measurements) approximately 4 1/4 lbs, which doesn't seem to be far off.
Anyway, fiberglass has a higher strength to weight ratio, but I don't know about the density and since resin & mat use vary from person to person you couldn't give one number. But without the same perimeter, wall thickness, and internal volume, a direct comparison it of no real value. But yeah, almost always a glass box will be significantly lighter than an MDF one.
Thread
Thread Starter
Forum
Replies
Last Post
InFaMouSLink
Car Parts for Sale
3
10-30-2015 09:43 AM
dirleton
2G RDX (2013-2018)
8
09-28-2015 04:48 PM
