Which direction to port?
01-02-2011, 02:14 PM
#11
Thanks BDL. I found an online calculator (actually Jordans roommate did, lol) that calculates the area of a crescent. I should be good now if I go with the bazooka design. 
Last edited by DeadlySones; 01-02-2011 at 02:24 PM.
I still want it as loud as possible.
01-02-2011, 09:11 PM
#15
Looks like a pain for tuning with the port facing the same direction as the driver....calculating the size of the slot to cut on the side of the tube at the back to start the port could be interesting.......
What about a round port shaped like a trombone slide....comes straight out the back, does a 180 to come back forward and the length of the U shaped section lets you adjust the frequency....make it out of 3 or 4" PVC pipe with a couple of 90degree corners??.........
01-03-2011, 05:39 AM
#17
Sure.....it looks like someone is tired of plain old squared off boxes.....
Looks like a pain for tuning with the port facing the same direction as the driver....calculating the size of the slot to cut on the side of the tube at the back to start the port could be interesting.......
What about a round port shaped like a trombone slide....comes straight out the back, does a 180 to come back forward and the length of the U shaped section lets you adjust the frequency....make it out of 3 or 4" PVC pipe with a couple of 90degree corners??.........
Looks like a pain for tuning with the port facing the same direction as the driver....calculating the size of the slot to cut on the side of the tube at the back to start the port could be interesting.......
What about a round port shaped like a trombone slide....comes straight out the back, does a 180 to come back forward and the length of the U shaped section lets you adjust the frequency....make it out of 3 or 4" PVC pipe with a couple of 90degree corners??.........
Besides, I've always wanted to play with this design and as long as I keep getting louder that's all that matters. Still not positive about direction port will go. I can always try all the rear ported ideas first, then play with the side. Trumbone idea isn't bad, then I can port back too. Might just try something like that first. Going to talk to someone today about letting me cut them to size and squaring up the faces. So the tubes will be exact. Then if I do have to cut into sides, I have access to bridgeport and/or CNC. I'm not too worried about cutting into the sides and being accurate. Now that I can calculate the area of any crescent, I know how big to cut port opening.
You have no idea how much I would love to make two huge bazooka tubes, lol. I researched them quite a bit, but port area was real low. I might still play with it @ some point this year.
Once I get the "enclosures" done, I plan to try many things... the rear wall will be able to slide into the enclosure to adjust internal volume, several different port options... I can't wait to get this under way. lol. I just need to make sure that I start big enough. Cutting down is the easy part, adding back on can get expensive...
Too bad I'm working with 350 watts. lol
Last edited by DeadlySones; 01-03-2011 at 05:51 AM.
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