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Tuning?

 

Bronze Member
Username: Stanleyc

Post 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?
 

Bronze Member
Username: Stanleyc

Post 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?
 

Bronze Member
Username: Stanleyc

Post Number: 31
Registered: Oct-04
Hmm, found it. Bump since some else just asked the same question in another thread, but remained unanswered.
 

Gold Member
Username: Jonathan_f

GA 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.
 

Silver Member
Username: Fishy

Tamarac, 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
 

Silver Member
Username: Fishy

Tamarac, FL USA

Post Number: 371
Registered: Sep-04
[edit] oops, that should read

Q = f0/(f2-f1)

sry, forgot the divisor.


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