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#2 do a search on aeroports in this forum or on google. #3 i dunno. sounds adequate, but im no expert. you could use an elbow and attach some striaght pvc after the elbow. run some sines at a volume just loud enough to see the cone moving. as you drop in frequency, the cone movement will be...

chris, just using the volume to arrive at an equivalent length doesnt work. the elbow adds resistance resulting in an even greater effective length than its volume would suggest. look in this thread for what an expert says in post #13 for a 6" flared port try looking at the aeroports. i...