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Discussion Starter · #1 ·
I am Building two sono subs with 15's, 24 inch diameter 6 feet high, or about 18 cubes apiece tuned to about 17hz and feeding it with a ep2500, my question is what port size is too big.:dontknow: I got a piece of 8 inch tube but not sure if it's too large, speaker parameters
Re: 3.95 ohm
Qts: 0.578
Qes: 0.673
Qms: 4.095
Fs: 24.5hz
mms: 130g
cms: .300mm/N
BL: 11
Vas: 284L
Xmass 27mm
Exodus xj15

Discussion Starter · #3 ·
my effective volume is about 17.230. According to win ISd using an 8 inch port tuned to 17 Hz would make it 22.375 or did I miss something. I'm kind of new to this fancy software stuff. Very cool though. I just got my circles cut, but waiting to cut for the port. I used the cheap quarter-inch rotozip bits in from Harbor freight, cut 10 circles with one bit , got three bits for six dollars .

· Registered
521 Posts
Definitely go with the 8" port. With the large enclosure volume you're using (relatively), you can go with 8" diam because the port won't be too long. This is a good thing as port noise and port compression will be practically non-existent, even at the port air velocity peak.

I'd tune a bit lower than 17Hz though. At least 15Hz, if not 14Hz. Those should make for fine subwoofers.

Discussion Starter · #8 ·
Thank you for your response willy, just curious, what would be the advantage with a lower tune? To me it seemed the plot showed increased low-end performance with lower excursion. Please advise. Thanks
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