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New tip for peanut measuring


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Techmaster 
Member - Posts: 42
Member spacespace
Joined: December 01, 2003
Location: United States
Posted: December 18, 2006 at 8:41 PM / IP Logged  
New tip for peanut measuring -- posted image.
New tip for peanut measuring -- posted image.
New tip for peanut measuring -- posted image.
New tip for peanut measuring -- posted image.
I wanted to offer a tip of a technique that I came up with myself...everybody knows the peanut method to measure your enclosure, but that doesn't do you much good once the enclosure is already made. What are you going to do, say "Oh no, my enclosure's not the right size, I guess I have to start over!" Yeah, you can aim small, and add stuffing to compensate for the enclosure's lack of size...but let's face it, it's not an exact science of how much you need to add for how much size compensation.
What you do, is figure out how much air space you need, measure out that much peanuts, and put it into a trash bag. My sub, a Diamond D6 12", needs .875 cuft of air space. The sub takes up .1 cuft. So that's .975 cuft, or 1 cuft if you don't feel like messing with decimals. ;) I measured out 1 cuft of peanuts, and made my bag. Then, I put it into the trunk to know how much I needed to mask. I'm currently laying glass onto my mold. It's almost there, just a few more layers in a few spots that I've been neglecting, and it will be ready. Then, I'll use my bag to get an idea of how much needs to be cut away. After that, I can use it to mount the ring, and know there's enough area behind it to get that 1 cuft. This is a great way to help myself actually visualize what 1 cuft actually looks like, while I'm fabricating an enclosure that's supposed to contain that. So far it looks like I'm right on target. ;) Hope this might help some of you out there.
sin0cide 
Copper - Posts: 49
Copper spacespace
Joined: August 03, 2006
Location: United States
Posted: December 20, 2006 at 4:26 PM / IP Logged  
interesting thanks for the post
Melted Fabric 
Silver - Posts: 509
Silver spacespace
Joined: October 24, 2003
Location: California, United States
Posted: December 28, 2006 at 4:04 PM / IP Logged  
Not a bad tip at all. This is appreciated.
I have not failed. I've just found 10,000 ways that won't work.
When you do not know what you are doing and what you are doing is the best -- that is inspiration.
ricoshay 
Copper - Posts: 67
Copper spacespace
Joined: March 23, 2006
Location: United States
Posted: December 29, 2006 at 9:03 AM / IP Logged  
this will help the guy that wants to measure his airspace in liters, since trash bags will give you the volume in liters too.
carbon fibre 
Member - Posts: 4
Member spacespace
Joined: January 10, 2007
Location: United States
Posted: January 10, 2007 at 10:37 PM / IP Logged  
All depending on where you tie it. Metric is the new and improved language of measures, so catch up.
carbon fibre 
Member - Posts: 4
Member spacespace
Joined: January 10, 2007
Location: United States
Posted: January 10, 2007 at 10:38 PM / IP Logged  
All depending on where you tie it. Metric is the new and improved language of measures, so catch up.
3lm3rom3ro 
Member - Posts: 19
Member spacespace
Joined: January 09, 2007
Location: United States
Posted: January 25, 2007 at 11:53 PM / IP Logged  
what is the benefit of having less air space??
wuz craking
Techmaster 
Member - Posts: 42
Member spacespace
Joined: December 01, 2003
Location: United States
Posted: January 26, 2007 at 8:37 AM / IP Logged  
Well, in a sealed enclosure, once you pass the sub's ideal airspace amount, you start losing a lot of things. Power handling ability, sound quality, etc... When a manufacturer says a sub needs 1.0cuft to operate at its best, that doesn't mean it will be twice as good at 2.0cuft. I'm sure others can explain it better than me.
bellsracer 
Silver - Posts: 703
Silver spacespace
Joined: January 14, 2006
Location: United States
Posted: January 27, 2007 at 2:13 AM / IP Logged  

With less airspace, depending on the Qs of the sub, various things can happen...

Power handling goes up (in an ideally sealed box) but it loses efficiency for output (basic physics) ie it will take more power to make the same level of sound.

Response goes up as well, but depending on sub, it may become unstable. With those with a soft spider (such as kicker) the response clarity goes up, but it risks more distortion from overpressure for SOME notes.

A third effect is that the sub will heat up faster and MAY cause it to fail sooner from deforming the voice coil former or melting the glue that holds the magnet wire in place (and causes the really bad smell from burned speakers)

Other things happen too but I just mentioned the more noticible ones.

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