It is a single 4 ohm coil, and unfortunately that is the only configuration. Downfiring should not be an issue.
The Koda should outperform the JL in both SQ and output. 3/4 of a foot may be a bit small, but according to Steven it sounded amazing in 1/2 a foot with 180 watts. I don't have the hands on with the driver that Steven does, so I'll let him answer that.
I can assure you of this, I am getting 1 to play with in my truck, and maybe 1 for my HT as well. I am going to compare it to my Shiva in the HT, and decide if I should build an enclosure for the other shiva I have in the garage (that would be a dual Shiva system), or if I should build a dual Koda, possibly in a bipole (yes bipole, not dipole... The idea intrigues me

) type install..