[southworth]

I've got a pair of SI HT 15 D2's that I'd like to build as some sonosubs. I looking to build a sonosub from 6-10 cu ft with 15-18Hz tune. Can anyone point me to any documented build projects? Thanks.

 

[southworth]

To elaborate, I was looking to use 18" diameter sonotube........................................

 

[willis7469]

Sonosub - Free Speaker Design Software

Free speaker design software allows easy selection of tube and port size to attain desired tuning frequency

www.subwoofer-builder.com

I used this when building one. Pretty simple and intuitive.
Those SI drivers are awesome. I’d love to do what you’re planning. I was considering these.

HST-15 mkII 15″ Subwoofer – Stereo Integrity

The HST-15 mkIII is the flat-out leader in output and sound quality out of sealed, vented, or passive radiator alignments with its 38 mm one-way linear coi...

stereointegrity.com

 

[willis7469]

Don’t know of any build plans sorry. I can recommend getting your tube from a concrete supply place. They’ll probably even cut it for you. You can cut the baffles with a jigsaw, or circle jig on a router, or even have a car audio or cabinet shop cut them if you need.

https://www.parts-express.com/ has affordable ports and grills and binding posts etc.