please check box design

[im45pl]

Hi guys, if anybody with experiance with 6th orders could check this design for me that would be great (please forgive my dodgy sketchup)

The box is for 4 lvl6 18" subs running off 4 5.0k. the rear chamber should be around 35ft^3 @ 25hz, the front chamber is 13ft^3 @ 50hz, this is for a ground pounder not a burp car so loud lows are what im looking for here.

The "shell" of the box is alot thicker then 1 layer of 3/4mdf just using this for internal only. My main concern is port postion and sizing, from what i have read and been told port speed can make a big difference here.

Any ideas or input (even its to tell me it sucks) is wanted.

thanks - from australia

oh i have conerted to inches for you guys aswell

[DustinBolt]

I,ve read thing where you do not want the outer chamber tuning to be exactly an octave above the inner tuning.

[im45pl]

I,ve read thing where you do not want the outer chamber tuning to be exactly an octave above the inner tuning.

i was actually told the exact opposite, as i said ive had no experience with these enclosures before so im just going off other info

[revoracing247]

ever tried throwing it in win isd? just an idea

[im45pl]

I have but it changes the port length etc and peaks of the chart at 25 and 50hz. but i have never really trusted those programs for a bandpass

[corona_jeff]

I think u got the ratio backwards. All the ones I have seen the rear cha pm er was smaller then the front

[im45pl]

I think u got the ratio backwards. All the ones I have seen the rear cha pm er was smaller then the front

it appears that i have so please disregard my design lol , working on a new one

thanks!