Dayton Audio ND140-8 5-1/4" Aluminum Cone Midbass Neo Driver 8 Ohm Dayton Audio's ND140-8 midbass driver features an efficient, low-distortion Neo-Balanced motor that 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. Highlights Extended-range 54 Hz to 8 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 40 watts RMS power handling