vented enclosure for 2 12w7

[jason2000ls]

Ya there 12 w7s and I can very easily get 5 cubes out of the trunk , now what I don't understand is how to achieve a 30 hz tune with 5 cubes. Like is there a mathematical formula ?? Hypothetically speaking both w7s in a 5 cube box (after driver displacement) would require a port of what size and length to achieve 30 ish hz tune ? I know ill also have to factor in port displacement ..

[jason2000ls]

So with drivers my box is 5.28 cuft bracing will add another .5 cu ft . So I'm at 5.78 cubes roughly. Now how what dimensions would my port be to achieve 30 hz? Either round or slotted.

[DylanBunch]

If you add bracing, you're going to take away the .5 of displacement. Also take away how ever much the drivers are. You dont add displacement lol

[jason2000ls]

Yes but if I aim for 5 cuft internal volume after displacement how would I not add . The sub takes up space as well as the bracing . So to achieve 5 cuft internal volume with 2 w7s an bracing I would need 5.78 cuft 5 cuft internal volume + the amount of space drivers displace which is .28 cuft bracing is .5cuft this is all basic math ..

[jason2000ls]

Can anyone here tell me how much port I need to achieve 30 hz tune,

[CaPRiCEx383]

Only thing that worries me here, Is the face. 30" on the face pretty much sucks.

I have the same 30" on 2 12" and with a 3.5" port, I got 0.25" between the subs. Just a little precautionary advice right now, Measure 3x before cuttiing any holes on your baffle.

[RobertR]

[jason2000ls]

perfect i will look into this design. is there any benifit in slot ported vs round ports ?? how off is this?? win isd states i need 5.79 cuft after i factor in driver and port displacment and i would need 3 x 4 inch round ports 18.85 inches in length to achieve 30 hz tune. i didnt factor in bracing. anything wrong with this design?? didnt really look totally flat response curve wise was a lil peaky at 38 to 40 hz should i be trying to design a box that plays flat .?? too small to be tuned to 30??? its 5.12 cube common chamber before driver and port displacment

( i can go a little wider on the face if i wanna get creative ) 35 ish inches

[cloud77]

Everyone that I see who have w7s have really pretty boxes, so make sure you add some pretty factor =p

[jason2000ls]

That I will . I'm hoping to completely seal off enclosure from trunk and run subs forward behind rear seats . Sunday is go day, RobertR is this enclosure built for w7 parameters ? An have you heard a similar setup ?