dumb round port question

[loud-n-low 10+ year member]

Im building a smallish subwoofer for my bedroom. im calculating that i need a 3" x 15" round port for a tuning of 25hz. would pvc be a bad idea? (ie port noise) any typical stores sell anything better that would be better? excuse my ignorance:*******:

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[fasfocus00 5,000+ posts]

no, it should be fine. if you can flare it, that couldn't hurt.

 

[misfit138 5,000+ posts]

You can pick up a 3" aero from partsexpress.com for like $13 + s&h...

 

[loud-n-low 10+ year member]

no, it should be fine. if you can flare it, that couldn't hurt.

where do ppl buy flared ports?

 

[misfit138 5,000+ posts]

where do ppl buy flared ports?

Precision Port 3" Flared Port Tube Kit | Parts-Express.com

 

[fasfocus00 5,000+ posts]

where do ppl buy flared ports?

you can either buy the kit or flare it yourself.

 

[loud-n-low 10+ year member]

is it normal for a smaller diameter port to be much shorter than a larger diameter port to = the same tuning?

ie 2 cube box, 3inch round port needs to be 13inches to =25hz....2 inch diameter port only needs to be 5inched for 25hz tune. Sound correct?

 

[Slo_Ride 5,000+ posts]

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You'll be fine with regular pvc for something small.

 

[RAM_Designs 5,000+ posts]

is it normal for a smaller diameter port to be much shorter than a larger diameter port to = the same tuning?ie 2 cube box, 3inch round port needs to be 13inches to =25hz....2 inch diameter port only needs to be 5inched for 25hz tune. Sound correct?

Yep. Larger port needs to be longer to = same tuning as a smaller port.

 

[loud-n-low 10+ year member]

Yep. Larger port needs to be longer to = same tuning as a smaller port.

so if i do a 2inch diameter port, would it be smarter to do 2 ports or 1?

 

[RAM_Designs 5,000+ posts]

so if i do a 2inch diameter port, would it be smarter to do 2 ports or 1?

More ports = longer length per port also. Just stick with a single 3" port.

 

[loud-n-low 10+ year member]

would there be port noise with a single 2"x 8" port?

 

[RAM_Designs 5,000+ posts]

Depends on the woofer and tuning.

 

[Bumpin' Goalie 10+ year member]

You said "smallish" but this could mean anything. It's relative.

Determining what diameter you need will have a lot to do with the subs displacement potential. Which includes size.

Let us know sub and also what size box. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[loud-n-low 10+ year member]

box is 1.8 cu ft. sub is a cheap Dayton audio 12". desired tuning is 25hz