Ok, well i've been reading everything i can find on this site http://www.diysubwoofers.org/ about different box designs, advantages and disadvantages. right now i'm looking at either a transmissions line, dual chamber ported, or just a basic ported box.
the goal is to get a LOUD system that doesn't sound harsh for day to day usage. meaning SQ is a factor. i have not had much experience with any of these boxes before, but the only way to learn is to try right? So now my question, which box design will be the most forgiving of small mistakes, ie. wrong volume, or the t/s parameters are off slightly. i assume that the "better" box will also be the least forgiving to these kind of mistakes. to be honest, im a little afraid of the TL design, it seems to be mostly trial and error, something i'm not particularly willing do to at this time. if i can just "copy" a design a found and try to keep it close to what is recommended for my particular subs, will it work ok, or will it have to be exactly perfect, meaning many trials? the actually construction of the boxes appear to be cheaper and easier, but harder to "do right"

and here's another question that is a little off topic but can ports be replaced by vents? and if so how do i calculate what size vent to use? i would rather make my own out of cheap wood than buy multiple ports if i need to go trial and error route. thanks

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Scott<br />Winnipeg Fiero Owners Group<br /><a href="http://winnipegfieros.hopto.org" target="_blank">http://winnipegfieros.hopto.org</a>

Well, a vent and a port are the same thing ... What you're talking about is a slot port versus a tubular port

Anyways, I always advise people to progress through the enclosures, starting with a sealed enclosure then advancing to ported then on to more complex designs ...

However, since the ported enclosure is the easiest to design out of those, I would go with that if you don't want to try making a sealed box first ...

[ July 07, 2003, 12:12 AM: Message edited by: Jmac ]

already made sealed, and fiberglass for my own car. fiero, space is tight. but now my buddy has a nice big trunk and i have a know it all coworker i need to shut up, lol.
that's exactly what i was talking about with the ports, i couldn't remember what they were called, glad you knew what i was talking about. so i know how to calculate the round ones, is it the same formula for the other shapes, just different area calculations? are certain shapes better than others?
i don't think making a ported box is very challenging at all, that's why i'm strongly considering these other types. im good at math, great at physics. my buddy's gonna be a carpenter, so we have most of the aspects covered. just not experience. the more i research about these, the more i'm leaning toward the dual chamber ported box, it's almost the same as a ported, doesn't seem like it's any more difficult to get right. and TL will be too long for two 10's i think. thanks for you help though, any other opinions?

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Scott<br />Winnipeg Fiero Owners Group<br /><a href="http://winnipegfieros.hopto.org" target="_blank">http://winnipegfieros.hopto.org</a>

Ported should be very simple then ...

Calculations are pretty much the same, but using DIYSubwoofers.com's formula is a little more complex with slot ports.


Where Av is the cross-sectional area of the port (in square inches),
Lv is the length of the port (in inches)
and Vb is the enlcosure's net volume (in cubic inches).

[ July 07, 2003, 01:51 AM: Message edited by: Jmac ]

As long as a round and rectanguar vent have the same mouth area they will have the same length.

Being good with math, I won't bore you with basic area formulas [img]smile.gif[/img]

TL enclosures are hard to get right in a car - I suggest avoiding them unless you have lots of time and even more patience.

For your application I would construct an ABC box - I think they call it dual chamber or something: http://www.diysubwoofers.org/prt/dual_chamber.htm

Results can be impressive and they sound decent too. I run one with a single 8 in my car and I like it.

ok, thanks a lot guys. i think i'll try the ABC or dual chamber box and see how that goes. if i have any troubles i know where to come [img]graemlins/thumb.gif[/img]

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Scott<br />Winnipeg Fiero Owners Group<br /><a href="http://winnipegfieros.hopto.org" target="_blank">http://winnipegfieros.hopto.org</a>