The Dayton Audio Reference Series sets a new standard of value in high-performance loudspeaker drivers. Utilizing an advanced motor system and a rigid aluminum cone, the Reference Series can outperform drivers that cost several times the price. Their low-distortion characteristics and high excursion capabilities provide exceptional clarity, detail, and dynamics. Woofer features a black anodized cone, heavy-duty cast frame, low-loss rubber surround, solid aluminum phase plug, distortion-reducing magnetic gap copper ring, rubber magnet boot, and gold terminals.