Hi,

I'm in the final stages of constructing a sealed box, but before I start throwing polyfill and carpet at it, I'd like to clear something up.

Although none of the box building guides that I read mentioned it, I saw on some forum (may have been here) that sealed boxes are supposed to have a hole of a couple mm so that the pressure can equalize with changes in altitude/temperature.

I'd just like to know if this is true, since none of the box building guides on the web mention it. However, it seems very logical to me (in fact I thought about it myself before reading it on the forum).

Thanks,
molo

 

I think if you do that it will become as you put it "a fart hole" making unecessary noise while playing. A small hole like that will sound like junk. Unless the box is super tiny, I cannot see atomospheric changes causing that much of a problem.

 

I agree it will make a god awful noise, I had a very small 3mm hole in the corner of a sealed box I built and I didnt notice it until I was like what the hell is that f*ckin sound.

 

If you wanna hear a fart noise, by all means go for it. [img]graemlins/laugh.gif[/img]

A sealed enclosure is meant to be airtight!!

I even go as far as sealing the sub right to the enclosure, with a rubber gasket.
One more tip when building a sealed enclosure: put a light into it, and turn off the room lights to check for any light coming out of the cracks, if you see any seal them up.

Good luck with your enclosure, and remember
"just say no to fart noises"

 

Problem solved:
Port the box

 

Hi guys,

Thanks for the replies. But really, I was just looking for a simple yes/no from someone with experience building sealed boxes.

Since we are in Canada, the boxes see from -20 C to +30 C, and a wide range of altitudes/air pressures. I took great pains to make this box perfectly air tight (my first build, and I don't have the best tools, so it wasn't easy). I don't want to ruin it with a hole if I don't have to (even if I can plug it with silicone later -- a mess ensues every time I grab onto silicone or glue). But I also don't want my woofer to implode when I take it from room temperature in Ottawa to -30 on top of Mt. Tremblant (scientifically, a bad example, but you know what I mean).

So, the guys that build this stuff a lot, do you put holes in, and have you ever had any problems due to air pressure?

[ October 29, 2004, 06:47 PM: Message edited by: molo ]

 

OK, cool, thanks.