Port question

[spoonraker 10+ year member]

Well I'm trying to design a box for my 15'' Fi Q.

I'm thinking somewhere around 3-3.5ft^3 tuned to 28Hz...

So I open up WinISD and type in 3.5ft^3, 28Hz, change it to slot port... Now I don't know the exact dimensions of what I need the box to be, so just to test things I type in 20''x5'' for the port area. It tells me I need nearly 90 inches of port length...

So just for fun I switch it to a round port. I type in a single 5'' diameter port, it says I need about 15.5'' of port length

Can that be right? Why does a round port require SO much less volume? The slot port volume is 9,000in^3 but the round port volume is only ~243.5in^3

Am I just using winISD wrong, is my math way off, or are round ports just way easier than slot ports?

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[spoonraker 10+ year member]

Well I guess I'm retarded and the only reason it came out that way is because my port area was so huge. I typed in 20''x2'' and the port length for the slot port was cut way down to something realistic.

lol

so I guess to salvage this topic....lets just discuss the differences between round and slot ports. Pros/cons? How do you mount PVC ports to the box, just glue them in with maybe a little bracing?

 

[Death By Bass 10+ year member]

glad you worked that out... 3 minutes after posting it...

 

[spoonraker 10+ year member]

I have a knack for confusing myself and asking other people right before I figure stuff out on my own.