Dayton Audio's ND105-4 compact aluminum cone midbass produces high-impact audio demonstrating the latest advances in high-excursion design processes. Extended-range 60 Hz to 10 kHz performance Rubber-edged aluminum alloy cone Large excursion capability—4 mm Xmax, 20 mm peak Self-shielded Neo-Balanced motor structure 1" 4-layer underhung voice coil with polyimide former 30 watts RMS power handling Dayton Audio ND105-4 4" Aluminum Cone Midbass Driver 4 Ohm Dayton Audio's compact aluminum cone drivers demonstrate the latest advances in high-excursion design processes. An efficient, low-distortion Neo-Balanced motor is combined with a rigid yet lightweight aluminum diaphragm, yielding impressive high-impact audio reproduction. Perfect for single point-source applications, or combined in multiples and line arrays.