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DIY For Audio
HELP: First Port Resonance
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<blockquote data-quote="Timber_MG" data-source="post: 511170" data-attributes="member: 18"><p>You need to consider the frequencies at which your port resonates. The helmholz resonance at port tuning frequency is a function of the box, the mass of air in the port and the surface area of the port. The harmonics are a function of a length and correspond to a Kundian pipe open at both ends with resonances starting at lambda/2. A floorstander is a tube with its own resonances and the trick is to choose the post placement such, that at the port terminus inside the box it is placed in a null at the resonant frequencies of the port (as many as possible) thereby damping those modes in stead of exciting them</p><p></p><p>There is a huge difference between a so-so and a great bass reflex box if you're after some bandwidth. Larger volumes allow for shorter ports and higher frequencies arising, one large benefit of HE in bass reflex and related enclosure types.</p></blockquote><p></p>
[QUOTE="Timber_MG, post: 511170, member: 18"] You need to consider the frequencies at which your port resonates. The helmholz resonance at port tuning frequency is a function of the box, the mass of air in the port and the surface area of the port. The harmonics are a function of a length and correspond to a Kundian pipe open at both ends with resonances starting at lambda/2. A floorstander is a tube with its own resonances and the trick is to choose the post placement such, that at the port terminus inside the box it is placed in a null at the resonant frequencies of the port (as many as possible) thereby damping those modes in stead of exciting them There is a huge difference between a so-so and a great bass reflex box if you're after some bandwidth. Larger volumes allow for shorter ports and higher frequencies arising, one large benefit of HE in bass reflex and related enclosure types. [/QUOTE]
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DIY & Tutorials
DIY For Audio
HELP: First Port Resonance
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