Which will sound better? I have a single 10 with a matching amp.

I know I want a sealed box, but don't know which will sound better... although I am leaning toward the square-ish box.

ANyone have any input? Thanks.

 

Shape does not matter, just internal volume.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vteg &raquo;</TD></TR><TR><TD CLASS="quote">Shape does not matter, just internal volume.</TD></TR></TABLE>

 

In that case, would I want something with close to 1ft volume, or closer to .8 ft?

What will the difference in sound be?

 

.8 will not extend as deep. You have to plot the sub to see effect.

 

so shape doesnt matter in enclosures at all, what about vented, as long as the port is the same.

 

Vented is a different animal, box shape does not matter, put port area, and proximity to walls can change the tuning.

 

o ok, but shape doesnt matter in sealed enclosure at all?

 

Nope. Unless you get into standing waves and other voodoo like that. For us mere mortals without golden ears, no.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vteg &raquo;</TD></TR><TR><TD CLASS="quote">.8 will not extend as deep. You have to plot the sub to see effect. </TD></TR></TABLE>

Menaing the sub will move less, right? Wouldn't that just make it crisper, but not as loud then?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">Nope. Unless you get into standing waves and other voodoo like that. For us mere mortals without golden ears, no.</TD></TR></TABLE>

You are correct. The shape can actually have an effect for the exact reason you stated.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SoCal ITR &raquo;</TD></TR><TR><TD CLASS="quote">

Menaing the sub will move less, right? Wouldn't that just make it crisper, but not as loud then?</TD></TR></TABLE>

The cutoff point will be slightly higher, hence a little less bass. You have to graph it to see the difference. It may not be noticeable. .8 to 1 does not sound like much to me, but that is 20% volume change.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nsxxtreme &raquo;</TD></TR><TR><TD CLASS="quote">

You are correct. The shape can actually have an effect for the exact reason you stated.</TD></TR></TABLE>

Isn't the best shape supposed to be a sphere

 

I believe it has to do more with the length of the box. I am no expert on box design though. Standing waves is not that easy to understand.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nsxxtreme &raquo;</TD></TR><TR><TD CLASS="quote">I believe it has to do more with the length of the box. I am no expert on box design though. Standing waves is not that easy to understand.</TD></TR></TABLE>

I have read that the wave will bounce off the back of the box and hit the woofer, causing the frequency fluctuation. This is how standing waves work in boxes. Then you have room standing waves to contend with also

Here is what JL has to say on the subject:
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">Enclosure Shape
While it is always a pretty good idea to stay away from perfect cubes, they don't necessarily have to be avoided like The Plague. Due to the very small dimensions of most mobile subwoofer enclosures, there is little chance of generating standing waves in the enclosure (standing waves cause nasty response fluctuations). For a standing wave to exist, the distance between parallel boundaries must be 1/2 the wavelength of the frequency at which the standing wave exists. Considering that sub-bass waves vary from 56.4 feet (20 Hz) to 11.28 feet (100 Hz), the generation of a standing wave is going to be impossible....after all, the enclosures we're speaking of have to fit in the average sedan or hatchback!
Any standing waves that might be generated by upper ordered harmonics (caused by distortion) in the enclosure can be readily absorbed with the addition of damping material such as polyfill (available at your local cloth store--it is used to stuff pillows and quilts) or Fiberglastm (the pink stuff) and/or they can be broken up with strategically placed bracing within the enclosure.

In short, don't worry too much about shape. Make the box to fit the space you can allot to the enclosure and forget about it--there are more important things to worry about...like bracing.
</TD></TR></TABLE>

Stolen from http://www.jlaudio.com/tutorials/boxdesign/

 

The JL site pretty much sums it up.
I am going to call L the wavelength

L= u/f

where u is the velocity of propagation through air which is approx 344 m/s
It would propagate at different velocities through different materials.

f is the wave frequency.

A standing wave happens at any n*L/2 where n is an integer.

So as long as the length of the box (or distance to speaker) does not = n*L/2 you will not have a standing wave.

If your interested this falls under the electromagnetics courses. Very tough course IMO.

 

Soooo, will a standing wave reinforce that frequency or cancel it. I am thinking reinforce, after thinking about the wave hitting a wall, and coming back to hit the speaker. It should be in phase.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vteg &raquo;</TD></TR><TR><TD CLASS="quote">Soooo, will a standing wave reinforce that frequency or cancel it. I am thinking reinforce, after thinking about the wave hitting a wall, and coming back to hit the speaker. It should be in phase.</TD></TR></TABLE>

Neither, the box won't be long enough to allow either if we go by JL's website.

 

I know that. LOL.

If I made a box large enough to get a standing wave, what would the effect be.

 

Ahh, I see now, hypothetical situation... sorry I missed that.

I would say that depending on the frequency some would cancel and others would be reinforced.

So if the box was half the length of the soundwave, I think it would be cancelled... but if it were the entire length I think it woud be reinforced.

Just my guess.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vteg &raquo;</TD></TR><TR><TD CLASS="quote">what would the effect be.</TD></TR></TABLE>

Are you talking Nodes, or Antinodes?

and...for the record, I'm gonna say box shape is a bit more improtant, than you lot are letting on about.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vteg &raquo;</TD></TR><TR><TD CLASS="quote">Soooo, will a standing wave reinforce that frequency or cancel it.</TD></TR></TABLE>

I believe you will see both.

This becomes more revalent at higher frequencies when the wavelengths are shorter. I would not worry about it at sub frequencies.


Modified by nsxxtreme at 4:13 PM 6/25/2003