updated box design, 2 sundown sa-12's

[devin171moto]

yeah yeah its me again. I love you all <3. going off of shredders suggestion i re-designed the box. center slot vented tuned to 30hz. i think its pretty solid just seeing if anyone notices anything i missed. shredders detailed plans didnt come through so i just drew it by eye and used win isd for port area calcs.

accounting for roughly 4 inch 45's and misc bracing should be around 4.5 cu ft.

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[THATpurpleKUSH 5,000+ posts]

Brace the 2 walls that face you in the picture and you're good.

 

[shredder2]

I resent the drawings @devin171moto ... check your emails now.


One thing... you drawings where each half of the port splits along the backwall should be 1/2 the width of the port exit.
Also do not forget end-correction when figuring port length.

My designs are always as accurate as I can manage.

 

[devin171moto]

I resent the drawings @devin171moto ... check your emails now.


One thing... you drawings where each half of the port splits along the backwall should be 1/2 the width of the port exit.
Also do not forget end-correction when figuring port length.

My designs are always as accurate as I can manage.

thanks man ill take a gander right now
and about the port width for the individual sections that run along the back of the box. i tried to make them half the front opening witch. but they would each need to be a 21 inch length and there just wasnt room in the box. so i had to widen them and cut their length in half to compensate. is that not okay?

 

[shredder2]

about the port width for the individual sections that run along the back of the box. i tried to make them half the front opening witch. but they would each need to be a 21 inch length and there just wasnt room in the box.

You misunderstood my meaning, what I meant was port "width" for example a 5" wide port will be 2.5" wide after the bend, then end-correct your length, yours is a 2 common wall port at the exit but a 3 common at the back of the port. A 3 common wall is easy... 1/2 the port width at the back of the port. The tuning will see a longer than visual port.
For example a 5" port 30" long with 2.5" width after the bend will actually need to be 29.375" down the center, it will change again if you incorporate 45's in the bends and that will affect chamber volume as well. Once I draw something up I always recheck volumes and measurements for the final volume/tuning.