Subs on font and side

[Bassman999 10+ year member]

I am building a small sub box for a friend. I was planning 2 subs on face port on face or where ever. He wants to do one sub on face one on top. If we do it that way he can fit grill covers on subs. If we do em on same face the subs will be one bottom right other top left of the face to fit. Box Is externally 12x111.5x10 Using 2 6.5" woofers. Will putting one driver 90* out of phase cause a cancellation or phase problem or a reduction in output? And if I did do one front and one top where would the port go, or would that complicate phasing even more? Box is built, but not cut yet. I think it will be a problem, but I have seen ppl doing this stuff b4. I dont know if it would have been better both on same face though. I know opposing faces i.e. front and back is fine, but that wont work in this situation.

Help me out guys, I gotta get this done tomorrow.

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[Bassman999 10+ year member]

I did it sub front and sub up port up. Sounds awesome with a 50hz high pass filter tuned to 50hz.

Im just going to throw on carpet and call it a day.

Btw this isnt a subwoofer, as he wanted lots of midbass from 50hz and up