4th order

[ben29555]

i have a DC lvl 4 18" i was thinking of making a 4th order but don"t know much about them.

the max space i have in my truck is about 8 to 8.5 cubes is it possible to fit one in that amount of space?

In your guy's experience dose a 4th order normally get louder or lower then a ported box

my current box is 6 cubes tuned to 32 according to the RE calculator but i think its off some

[ben29555]

bump..

[ben29555]

anyone ?

[matt402]

how much depth do u have to work with?

my expertise with bandpasses comes down to guessing ?...

[uhoh_45]

band passes are tricky

rule of thumb for a 15 you need 1.5 cubes sealed and for an 18 roughly 2 cubes sealed

2-1 ratio is musical

3-1 both musical and spl

4-1 way to peaky

and there usually tuned roughly to 60 hz

so for your 18 you'd need roughly an 8 cube box 2 sealed and a 3-1 ratio you'd need 6 cubes ported

then comes the guessing/trial error shit and when you play with port area and what not and play with shrinking the box to dial it in

Edited February 10, 2010 by uhoh_45

[ben29555]

band passes are tricky

rule of thumb for a 15 you need 1.5 cubes sealed and for an 18 roughly 2 cubes sealed

2-1 ratio is musical

3-1 both musical and spl

4-1 way to peaky

and there usually tuned roughly to 60 hz

so for your 18 you'd need roughly an 8 cube box 2 sealed and a 3-1 ratio you'd need 6 cubes ported

then comes the guessing/trial error shit and when you play with port area and what not and play with shrinking the box to dial it in

ok i should be able to do that

where dose 60hz come from i realize its different then a normal box but i want to hit real low because 85% of the music i listen to is slowed

[ben29555]

then comes the guessing/trial error shit and when you play with port area and what not and play with shrinking the box to dial it in

so do you think i should use a removable port?

[uhoh_45]

the sealed part of the box tunes your lows depending on how big the box is, and the ported being 60 gives you the highs so you have a spread from say 30-60 hz

and as for removeable port its not really necessary but what i would do is have a removeable top layer so you can access sub and the port from the top

Edited February 10, 2010 by uhoh_45

[ben29555]

the sealed part of the box tunes your lows depending on how big the box is, and the ported being 60 gives you the highs so you have a spread from say 30-60 hz

and as for removeable port its not really necessary but what i would do is have a removeable top layer so you can access sub and the port from the top

ok sounds good

and would making the 2 cubes smaller by adding extra bracing make it hit lower of higher?

Edited February 11, 2010 by ben29555

[ben29555]

2 cubes sealed 6.27 ported 90sq inches of port tuned to 60hz

good?