sub box design, im sure u hear alot about it here, perhaps the SQ section is not the place for it. anyway....

sealed boxes are spose to be the best for SQ am i right?

on the spec lists of subs, sealed enclosure volumes are specd at a varying size, like 0.5 cu to 1.2 cu or whatever. i know putting dacron in ur box makes the sub respond tighter.

does that mean i could build a box on the slightly larger side and pack it with more and more dacron fluff to get it sounding sweeter? or should i be shooting for the optimal enclosure size and fiddle from there?

also is a CUBE design box goin to make any difference to a WEDGE shape design box? just wondering!

cheers!

dacron is used to "trick" the sub into playing like it is in a larger enclosure. A smaller sealed box will make the sub tight whereas a larger box will start to make the sub sound boomy.

there will be no difference between a wedge box and a cube box given they have the same internal volume.

Hmm, well I don't know what your best bet would be to do as far as dacron and box volume goes, but the difference between wedge-shaped and cube-shaped would be that wedge shaped helps to reduce backwave reflections from the sub.
Having parallel walls (like in a cube-shaped enclosure) for the sub mounting wall and the opposite wall create bad environments for internal reflections, it's best to have these two walls on an angle to each other. Or so the prophecy tells us.

I've been told the ultimate shape for a sub enclosure is a sphere.
And I'm actually drawing designs on making it!

dacron doesnt do much. It mainly stops internal box reflections, and might make 1% difference to sound if you packed it tightly.

If you build the box bigger, you can always add solid materials to take up volume, and glue/screw them internally. Doesnt have to look pretty so long as its secure and takes up volume. Could be blocks of mdf, for instance.

adding dacron will affect how low your sub can play,
it's depend how many dacron you fill in the box, whether it 25%,50% or the whole box, it will sound different, and to get the right box size it's quite complicated if you calculated manualy, but it take 5 second, if u using software.

i've seen these hifi sub enclosures supposedly one of the best ever built they are exactly that a big sphere i think they are meant for a 12 inch driver but at the moment they are sitting outside as ornaments :| ill get pics of it. it looks like a flower pot its made of grey concrete

ok if i need software to determine box size where can i find it? can some1 add a link for me to an EASY TO USE program please? so will a good program giv u a size based on the sub's output or rms or what? is there a perfect box size or does it come down to the sound i want?

ive also heard of filling the port with straws will tighten it up or foam also works

Sorry brucee, but it will affect clarity more than anything else, and again minimally. It shouldnt be advocated as a way to "get away with" making a box smaller.

what are the specs of the sub?
I'm not at my computer with the programs on it, and some people here have very advanced software. so post up the specs and someone might help ya

You may have already found it but there's a program for calculating enclosure volumes in the Installation/Fabrication Discussion. It's a "Sticky" thread titled "Car Audio Australia Enclosure Calculator"

If you have a complicated shape you have to 'cut' it into sections, calculate their sizes and add it all together.

The Program takes measurements in inches and gives the result in cubic feet which is a pain but what I do is put the sizes in metric using decametres (one decametre is 100 mm) then multiply the result by 12^3 and you get Litres

The computer thinks you've put in inches and converts it to cubic feet, so by multiplying the result by 12x12x12 converts it back to cubic "inches" but it's actually cubic decameters. One cubic decameter is equal to one Litre. I find this much easier than converting all the sizes into inches and converting it back again and it's more accurate.

Hope that helps