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Message: <blockquote data-quote="Moble Enclosurs" data-source="post: 7703439" data-attributes="member: 634917">Box shape is just as important as placement. But that does not mean the shape can cause more negative than positive. Two important things that you may or may not have heard of will effect the performance of the design........golden rule and baffle area( in relation to volume compliance).1. Golden rule has been around since the beginning of time lol. Seriously though, looong before audio was incorporated. Many artists and engineers live by this rule due to the ability of what it can accomplish in an architectural form. And the rule has been applied to acoustics from a physics standpoint as well.With the golden rule, there is a conformity that allows certain acoustical effects to either be allowed or ignored for the sake of proper performance. In sub design, this is for reducing what is known as standing waves, which create peaks and nulls in the response curve. The more peaks and nulls, the less desirable the output is to the listener in most cases of musical performance. So, it has been said that by utilizing the golden rule, you can achieve smoother transient responses without, or with minimalized need for, equalization beyond the physical design.Though this is a great idea, other things have to be in play for it to become usable in subwoofer design due to the need for more room to accommodate the changes audibly noticable in LF response. All in all, it is always a good rule to conform to regardless of its intensity in effecting the curve.2. The baffle area. Why is this important? Mainly because of placement within a limited space that can cause phase effects making the response once again, undesirable.....to a point. If you have a certain compression volume and do not feel the need to manipulate it for any reason, then making sure the baffle area is a certain area will greatly effect the phase of the design due to the same reasons that the golden rule is applied, just in a different manner. Normally, when the baffle exceeds a certain point in relation to volume of a third dimension for a non specified but also non uniformed depth or height, the chances of resonances occurring is increased, hence changing the peaks and nulls once again in the response curve.By making the baffle a good area without causing a huge ratio difference of the third dimension, you allow the design to act more on the propagation effects rather than a pressured response for efficiency and phase correlation from the drivers original output point of source.So, say you have a 1 cubic ft volume, you want to keep the baffle as close to a 1:1 ratio of area with the other planes as possible.BUT, there is a catch to this......it has been said that making all planes the same area will also cause resonances. Though this is true, it is only true for certain conditions....1. That yes, it will cause resonances still, as anything within a given boundary will have, so that is not the issue. 2. The issue is that the same resonant frequencies will be excited on all planes therefore increasing the sensitivity of those specific harmonics by at least 3-12db higher than other harmonic resonances in that space. So, that is the reasoning for a volume to not be equal on all planes.I know that is a LOT of information, but if you can get the idea, those are the main reasons for shape being important in the designing of audio enclosures. Other than that, the only other limitations are your imaginations.Hope that helps.</blockquote>

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