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Pi versus T-S [message #39137] Wed, 20 November 2002 01:44 Go to next message
Pilkar is currently offline  Pilkar
Messages: 19
Registered: May 2009
Chancellor
hello guys! i have some doubts, and i think you can help me. i have just finished the design of my new speakers (by the T-S theory). i visit this site nearly every day, and is difficult not to get interested in the Pi aligment theory. so, i would like to know, which are the advanteges of Pi over T-S, and vice versa.
i will be using the selenium wpu1205 (12") woofer, paired with the d405ti driver on a hl1450 horn, all selenium. the box is designed to have a smooth response up to 55hz (f3 point), at 40L. i would like to know how big would be the box using Pi theory. all i want is a powerful bass, not too much extention.
this is the woofer data:

sensivity= 95dB
Fs= 46Hz
Vas= 57L
Qts= 0.33
Qes= 0.34
Qms= 11.92
Re= 6.7ohm
Le @1KHz= 1.324mH

thank you very much!

Pilkar


Re: Pi versus T-S [message #39138 is a reply to message #39137] Wed, 20 November 2002 03:01 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18786
Registered: January 2001
Illuminati (33rd Degree)
Using the data you provided, Vas=57L, Qts=0.33 and Fts=46Hz, you can enter these values into PiAlign as Vad=2ft3, Qd=3 and Frd=46Hz. PiAlign recommends a rather small box of 0.667ft3 (20L), tuned to 52Hz with a port that's 4.4" long and with area of 4.3in2. It further recommends that this be accomplished with a cylindrical port of 2.35" diameter or a rectangular port of 1.56" x 2.77". The system would then have -3dB around 70Hz, I expect, and would work well as a midwoofer system, perhaps as surround speakers or as mains designed to be used with subs.
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