Experience quality sound with the Diamond Audio CM315D2 subwoofer. This black subwoofer offers superior audio performance due to its driver size and RMS power. Connect a wired subwoofer to your sound system and enjoy the high-end features of the Diamond brand. I haven't used it for about a week, but it was working fine before. This is one speaker only. #DiamondAudio #CM315D2 #Subwoofer #Acoustic #High-end #Used item