Okay, so I've designed this sub box for my car. Sub is a pioneer TSW-301R (the 12" one) and recomended internal volume in 1.5cuft^2 for a sealed enclosure. Just wanted someone to check it to makes sure it looks right. I am using 3/4" MDF.
Do I have to minus some of the volume for when the sub in in the box, and if so where can I find this value and will just making the length bigger work?
Is wood glue and screws good enough to hold it together, with some sort of poly sealer on the inside?
I got given some damping to use, but I also got told that if the sub box is the recomended size not to worry about it, thoughts? (it's like thick cotton wadding)
And if I put it in what sides do I put it on and are staples good enough to hold it?
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Sorry for the crappy paint drawing. xD
Thanks for any help.
Do I have to minus some of the volume for when the sub in in the box, and if so where can I find this value and will just making the length bigger work?
Is wood glue and screws good enough to hold it together, with some sort of poly sealer on the inside?
I got given some damping to use, but I also got told that if the sub box is the recomended size not to worry about it, thoughts? (it's like thick cotton wadding)
And if I put it in what sides do I put it on and are staples good enough to hold it?
An externally hosted image should be here but it was not working when we last tested it.
Uploaded with ImageShack.us
Sorry for the crappy paint drawing. xD
Thanks for any help.
Wood glue and screws should be just fine for construction. Just make sure the box is air tight and strong. The air pressure inside the box during operation is great enough to find any weak spot in your construction and make it fail.
If you add dampening material inside the box the apparent volume will be larger as the actual volume, as a rule of thumb add 20% for a fully stuffed box.
Yes you have to deduct the volume of the woofer of the total volume of the box, anything inside the box which is not air or stuffing has to deducted (you can compensate for the volume of the woofer by adding stuffing).
Good luck with your project!
If you add dampening material inside the box the apparent volume will be larger as the actual volume, as a rule of thumb add 20% for a fully stuffed box.
Yes you have to deduct the volume of the woofer of the total volume of the box, anything inside the box which is not air or stuffing has to deducted (you can compensate for the volume of the woofer by adding stuffing).
Good luck with your project!
Thanks for the info.
Just to clarify, does this mean I should reduce the size of the box by 20% if using the cotton wadding on the inside?
And I found the displacement value of the sub, is this what I need to minus from the internal volume?
Just to clarify, does this mean I should reduce the size of the box by 20% if using the cotton wadding on the inside?
And I found the displacement value of the sub, is this what I need to minus from the internal volume?
You didn't say if the box is compress or bass reflex system?Because if you are making bass reflex you don't need to put nothing inside the box (cotton ect.).If the box is compress system (closed),than you can put a 2 cm sponge only on the back side of the box ( it's enough) 😉
The recommended volume may assume stuffing, or not. It won't make a big difference either way. Detailed woofer specs sometimes include the driver volume. Or you can dust off your geometry text and calculate the volume of a truncated cone and cylinder and get close enough.
Bass reflex cabinets often use some damping, but maybe that's most important for boxes that operate into the midbass to midrange. I think I salvaged some leftover fibreglass batt scraps from a construction dumpster when I built one of my bass bins, and stapled them to the inside. For a sealed box, I often just buy a cheap fiberfill pillow if I can't be bothered to go to a fabric store.
Bass reflex cabinets often use some damping, but maybe that's most important for boxes that operate into the midbass to midrange. I think I salvaged some leftover fibreglass batt scraps from a construction dumpster when I built one of my bass bins, and stapled them to the inside. For a sealed box, I often just buy a cheap fiberfill pillow if I can't be bothered to go to a fabric store.
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