Twin Alpair 7's studio monitor build.

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Ok sir, you want the up-firing option...

You can take one of the drivers from the studio monitor design and place it on the top - should be ok to do. The overall sonic presentation might change due to the top firing driver interaction, but rest should work out ok.
 
I couldn't live with 2 x 4" drivers stacked under over facing you (like a derringer).
It helped sound cleaner, but I had to level them with pennies sitting 10' away, any slouching and highs were lost.

2 x 4" worked well crossing 24db 5khz to a piezo.
Assuming you can live with the bass that comes from 2 x 4" of cone area.
A woofer run wide open (but was rolling maybe 500hz due to inductance) worked well, especially making up for the narrow baffle I had the 4's on.
 
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