dual obsidian audio 18s box help

[ZAPCO209]

Whats up smd forum members my name is carlos been out the car audio game for a while but now im back putting together the system i wanted back in the days. I will be receiving two oa 18s i kno there are box calculators but ive never used them i would appreciate some help on a ported enclosure subs facing up ports to the rear they will be goin in a 02 tahoe. Not sure if it matters but two zapco reference 1000s will provide the power and zapco px the equalization. Thanks in advance.

[Joe X]

So here is a suggestion, check the dimensions suggested to fit your space:

Enclosure Specifications:

Fb = 32 Hz
Vb = 11 ft^3

External Height = 21 in
External Width = 45 in
External Depth = 30.375 in

Port Width = 33 in
Port Height = 4 in

Cut Sheet List:

* All Dimensions in Inches.
* Wood Thickness is 3/4 for all Parts.

External Enclosure Parts:

2 x Top & Bottom (3 parts) = 45 x 30 3/8

Left & Right Sides = 28 7/8 x 18 3/4

Front & Back = 45 x 18 3/4

L Port Internal Assembly Parts:

Front to Back = 19 3/8 x 34 1/2

Port Left Side Assembly:
19 3/8 x 4
Port Right Side Assembly:
19 3/8 x 4

Assembly guide (generic dimensions):

Important notes:

- The port needs 4" of free airspace in front of it for proper operation.

- Setting your amp subsonic filter to 28Hz is suggested.

- All the bracing shown is necessary for proper operation.

[ZAPCO209]

Thanks joe is 32 hertz low enough i listen to a lot of bass heavy music

[Joe X]

It will play down to 25Hz like it is above, anyways it can be done bigger and tuned lower is just about how much space are you willing to give up and more importantly that the port is not too near to the rear gate so check that to be within 4"-6".

[ZAPCO209]

Awesome thanks for your help joe

[ZAPCO209]

finished product a few months later

[Leo1103]

box looks good man, did you wrap it or paint it?

[ZAPCO209]

Its wrapped with a felt like carpet from my local fabric store

[mrdavebasshead75]

Looks good! U got it playing yet??

[ZAPCO209]

Yea but im only running one of the reference 1000s gotta get electrical beefed up before i hook up the second one. It sounds very good im vey happy with how it sounds they get super low