ALPINE R-Series 10" Shallow Profile Dual 2 Ohm Dvc Subwoofer - RS-W10D2 Speakers Focal recommends you use four

Focal recommends you use four amplifier channels to bi-amp these speakers by using the crossover's separate inputs for the tweeter and woofer

Tweeter diameter (slim-fit): 40mm (58mm with housing)

High grade ABS plastic to withstand heat and UV rays

The all-new R-Series shallow profile subwoofers are extreme in every way

Each pair of main channels is also fully bridgeable

ALPINE R-Series 10" Shallow Profile Dual 2 Ohm Dvc Subwoofer - RS-W10D2 Speakers Focal recommends you use fourThe all new R Series shallow profile subwoofers are extreme in every way, commanding a tough and rugged appearance with high performance bass output to match. Alpine takes compact bass to the next level with a state of the art design coupled engineering innovation to accomplish an ultra shallow profile without compromising on bass level output and quality in anyway. An exclusive dual gap motor structure combined with a powerful neodymium magnet allows