In Reply to: PiAlign RS1354? posted by craigha@attbi.com on January 02, 2002 at 08:04:30:
Hi Craig,I calculated Pi Align for RS-1354 some time ago, but not built them.
Where I was confused was a really small port dimensions.
In the Pi align, there is another factor to be considered, which
is the ratio Qe = Lp^2/Ap. For RS-1354 in 0.234 cu ft Pi aligned
box tuned to 41.6 Hz, this ratio is 2.206. The only possible port dimension I found is Dp=0.414" and Lp=0.545" - not a huge port, it
risks to produce some noise, IMHO.
I do not understand exactly how important is to keep this ratio close to calculated Qe value. What's more important: use such a small
port or make the port bigger and then keep right values for Qe or rather for Fre?O'tor
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