Done with my new sonosub.... (1 Viewer)

[Joe Tilley]

This is my second sono after my first got crushed recently. This time I ended up just trying out some dumb luck,I went ahead & used everything from my first sub so I didn't have to cut out anymore circles.I went with another 16" tube but added 4" to it making it 46" high & reused my Dayton 15"DVC & PE 250 watt amp. The other change I made was to port it with a 4"by 15" port that I hand made flared ends for on both ends out of some oak.
Well I got to say I have no clue as to what the tunning may be at (like I said DUMB LUCK) I tryed some various lenghts of port until it sounded right to me,& I got to say it is a pretty good improvement over my recent sealed system.The bass is actually tighter sounding & it will play quite a bit lower than before.
Well I just thought I'd share my dumb luck experience

 

[Dustin B]

Well, I took your numbers and did some rough calculations making some assumptions and guesses for a couple numbers.

I used the actual inner radius of the sonotube to be 8.2". I said the flared ports effective straight length was 16" (this is a big guess). And guessed that 2" of that 46" is occupied by the endcaps.

Roughly then with some rounding the result is a 150L enclosure tuned to 18hz (if the actual effective staight pipe length is 15" then the tune rises to 18.5hz).

 

[Joe Tilley]

Thanks Dustin, as far as the port goes it is 15" before the flair,in total if you count the flared ends its 16&1/8"long.
I didn't measure the total inside with the caps in place but, I would think your right as each end has three pieces of 3/4"MDF of which one is on the outside on both ends.
I wish I had an spl meter to take some measurements,I got to playing around last night with some music & I cant believe how much lower this thing goes than before.There is a couple upper bass levels that don't sound quite as good as before,but I'm pretty happy with what I did get out of it for something that I just threw together pretty much.