sonofabish i need help

[dirtysouth31 10+ year member]

box is 40 wide.33 tall and 12 deep at top and 17 at bottom..double baffle and 2 6 in ports that are 12 3/4 long....whats the tuning???? pics in link...

is for 18" btl.....http://s874.photobucket.com/albums/ab309/riggerchaser/

Click to read more...

 

[pr-festiva 10+ year member]

i didnt see the picks,, didnt look though. is the ports flared?

 

[dirtysouth31 10+ year member]

no just pvc..

 

[pr-festiva 10+ year member]

about 33Hz or so going by psp's calc

 

[dirtysouth31 10+ year member]

ok..thanks....i was thinkin the ports were to long..its low but on higher notes not the same as before..i always cut ports whatever the outside diamater is at least that off back wall..6" pipe at 6 in off back wall..right now its at about 3"or so..

 

[pr-festiva 10+ year member]

it only being 3"s from the back wall is changing your tuning and restricting the air flow from them

 

[dirtysouth31 10+ year member]

i think im gonna make 10" and see what happens

 

[pr-festiva 10+ year member]

calc says 36.4 hz

 

[dirtysouth31 10+ year member]

if i cut shorter that raise the tuning and longer tunes lower??am i right

 

[MisterGrubbs 5,000+ posts]

if i cut shorter that raise the tuning and longer tunes lower??am i right

Yessir.