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Bronze Member Username: StanleycPost Number: 20 Registered: Oct-04 | I keep hearing the term tuning when talking about a subwoofer enclosure. What is it and how do you do it? |
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Bronze Member Username: StanleycPost Number: 21 Registered: Oct-04 | I just read this: http://trapagon.com/Audio/Technical/body_technical.html Can someone explain it in laymans terms? What is this "Q" that keeps being mentioned? |
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Bronze Member Username: StanleycPost Number: 31 Registered: Oct-04 | Hmm, found it. Bump since some else just asked the same question in another thread, but remained unanswered. |
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Gold Member Username: Jonathan_fGA USA Post Number: 2103 Registered: May-04 | "Tuning" is the frequency that the air inside a port resonates, producing more SPL at that frequency, and also controlling the subwoofer cone. |
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Silver Member Username: FishyTamarac, FL USA Post Number: 370 Registered: Sep-04 | Q is the "Quality Factor" which is a measure of the steepness of resonance and is defined by Q = f0(f2-f1) for a bandpass/notched signal where f0 = the center frequency f2 = upper down 3dB or half power point f3 = lower down 3dB From looking at the equation the wider the "distance" between the to -3dB frequencies lower the Q and visa versa. Thus a system that has a sharp peak would be a "high" Q sytem. One that has a flatter effect would be low Q. I'm not exactly sure how this applies to a sealed enclosure mathematically, but I'm sure it has something to do with the peakieness/flatness of the effect the enclosure has on driver output. -Fishy |
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Silver Member Username: FishyTamarac, FL USA Post Number: 371 Registered: Sep-04 | [edit] oops, that should read Q = f0/(f2-f1) sry, forgot the divisor. |