im getting either one of the two but im getting 2 of each in a ported pro box with a Power Acoustik OV1-4000D. Heres the Specs of both the subs




Hifonics B15D2

15" Brutus Series Subwoofer
Power Handling:
Peak: 1400 watts
RMS: 700 watts
Impedance: Dual 2 ohms
Polypropylene cone woofer
Stitched NBR (Nitrile-Butadiene Rubber) surround
Integrated one-piece spider tinsel-lead design
Nickel-plated push terminals
For ported or sealed installations
Nomex spider material
Anti-resonance magnet boot
Nickel-plated ported back plate
4-Layer high temperature 3" dual 2 ohm aluminum voice coil
100oz. Double-stacked magnet structure
Sensitivity: 88 dB
1-year Sonic Electronix warranty
Subwoofer Specifications
Subwoofer Size 15"
Voice Coil(s) Dual (2 voice coils)
Impedance (per voice coil) 2 ohms
Peak Power Handling 1400 watts
RMS Power Handling 700 watts
Woofer Surround Nitrile Butadiene Rubber (NBR)
Woofer Composition Polypropylene
Sealed Box Volume 2.00 - 3.00 cubic feet
Ported Box Volume 2.00 - 3.25 cubic feet
Sensitivity 88 dB
Frequency Response N/A
Xmax (millimeters) 15 mm
Top Mount Depth 7.8"
Cutout Diameter 13.8"
Warranty 1-year Sonic Electronix

Kicker CVR15

Size 15 -inch
Impedance 4 ohms
Cone Material Injection molded poly
Surround Material Santoprene rubber
Sealed Box Volume (cubic feet) 1.8 - 5.2
Ported Box Volume (cubic feet) 3 - 5
Free-Air No
Dual Voice Coil Yes
Sensitivity 89.1dB
Frequency Response 25 - 0.5k Hz
RMS Power Range (Watts) 100-500
Peak Power Handling (Watts) 1000
Top Mount Depth (inches) 8 1/8
Cutout Diameter or Length (inches) 13 3/4
Vas (liters) 261.45
Fs (Hz) 20.8
Qts 0.425
Xmax (millimeters) 12.5
Factory Refurbished by Kicker
90-Day Manufacturer's Warranty
Authorized Kicker Internet Dealer

Are these for car audio? You should ask this question in the car audio section.