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Jodean wrote:
 1) The sonotube i got was 17 3/4" inside diameter and 1/4" wall. Is this sufficient? |
Yes.
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Jodean wrote:
2) anyone know if all sonotube are equal in tensil strength or other brands and are they even as stong as a square box 3/4" particle enclosure. I assume you dont want any give to keep the accurate tones. |
Basically, yes. There is a "quiktube" brand sold at Lowes that is considerably thinner. I've not heard of anyone using it without doubling it up.
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Jodean wrote:
3) Most drivers are only rated to 20 hz. I assume the design of the enclosure gets you below this? Or is there something else that determines that? |
I'm not sure what you mean by "rated" but ports or passive radiators allow you to play below the Fs of a driver.
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Jodean wrote:
4) I have 6" pvc pipe for the port and it is also 1/4" wall. Hows pvc for tensil strengh? |
PVC has a tensile yield strength of about 6000psi. For ports stiffness is more important and 6" PVC is plenty stiff.