box tuning

[SicAudio 5,000+ posts]

got a guy on a forum ( roe ) that says a 3.75cf box with a 12.5" x 3" port needs to be 27" long for 35hz instead of 16.25" long for 35Hz

he is using 2.6cf and tuning to that wtf?

thoughts?

ideas?

anyone wanna do the math to prove it?

i say 16.25 not accounting for sub.

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[phemps 10+ year member]

gimme a minute ill do it on paper

 

[SicAudio 5,000+ posts]

ttt

 

[phemps 10+ year member]

it should be close to 16.25 or so. port tuning should be based on net volume. so was the 3.75 after sub and port and braciing displacements?

 

[SicAudio 5,000+ posts]

for the most part yes just to get the point across. the actual volume is 3.6 after sub and double baffle

22 x 26.75 x 14 14x26.75 is double baffled.

heres the link.

http://forum.realmofexcursion.com/enclosures/66113-whats-box-tuned-new-post.html

 

[phemps 10+ year member]

for the most part yes just to get the point across. the actual volume is 3.6 after sub and double baffle
22 x 26.75 x 14 14x26.75 is double baffled.

heres the link.

http://forum.realmofexcursion.com/enclosures/66113-whats-box-tuned-new-post.html

but the port displacement wasnt included?

 

[SicAudio 5,000+ posts]

no he is accounting for only 2.6cf which is after some random port length he came up with and called it 35hz at 27" lol

even winiasd says at 27 it is 29.53hz bbp same all online port calcs say the same too. he thinks u tune from volume after the port instead of before the port. you cant tune after the port if you dont know what the port length is yet.

 

[phemps 10+ year member]

no he is accounting for only 2.6cf which is after some random port length he came up with and called it 35hz at 27" loleven winiasd says at 27 it is 29.53hz bbp same all online port calcs say the same too. he thinks u tune from volume after the port instead of before the port. you cant tune after the port if you dont know what the port length is yet.

ha nope. gotta get your port length from your net volume, then calculate its displacement then use that to give you your third box dimensions to account for the port displacement

 

[gtbike900 10+ year member]

too much port area

 

[phemps 10+ year member]

too much port area

no. if anything not enough

 

[gtbike900 10+ year member]

37.5 for 2.7 cubes ya thats to much

 

[phemps 10+ year member]

i was going by the what i thought was what the guy actually wanted... 3.75 cubes. even so 13 sq inch per cube isnt too much

 

[phemps 10+ year member]

i was going by the what i thought was what the guy actually wanted... 3.75 cubes. even so 13 sq inch per cube isnt too much

 

[gtbike900 10+ year member]

if it was 3.75 net it would need to be 16.95

 

[gtbike900 10+ year member]

length