??
Kicker CompVR 43CVR124??
You could go ported, with that driver you will need a 4.5 cubic foot box, for 1 sub, that's a big f'n box! While you can go ported, this driver can also be (and technically speaking) is designed for a sealed enclosure. I ran the numbers on this woofer in in BASS box pro and here is what it said.
Both sealed box's are stuff with aproximately 1lb polyfil to 1cubic foot of volume.
.7 Cu. Ft:
Box Properties
Name:
Type: Closed Box
Shape: Prism, square
Vb = 0.669 cu.ft
Qtc = 0.969
QL = 20
F3 = 51.27 Hz
Fill = heavy
1 cubic foot:
Box Properties
Name:
Type: Closed Box
Shape: Prism, square
Vb = 1 cu.ft
Qtc = 0.869
QL = 20
F3 = 47.34 Hz
Fill = heavy
Not exactly low, but very flat responses (almost zero rise through entire frequency band) from around 47Hz to 300Hz
4.5 Cu Foot vented box, no fill:
Box Properties
Name:
Type: Vented Box
Shape: Prism, square
Vb = 4.5 cu.ft
Fb = 27.93 Hz
QL = 20
F3 = 22.64 Hz
Fill = minimal
No. of Vents = 1
Vent shape = round
Vent ends = one flush
Dv = 5 in
Lv = 10.68 in
Quite a bit lower w/an f3 of 22.64Hz, pretty flat with a slight 1.5db bump in the desirable area of 35Hz to 45Hz but that is in a very large box. No issue with wasted power or cone displacment at rated power of 400 watts. In order to avoid unwanted resonance from the driver FS, recomend using a subsonic filter at 15-20Hz
I tried to go lower in size but using a decent size diameter or slot port came out WAY to big. A 5" Dia. port in a 3 cubic ft. box was 27" long for an F3 of25Hz but the the output would need to be manipulated with DSP to get it flat, it was really bad! So, couple of sealed options, 1 ported option, goal dependant.