D76MX     ...Excellent replacement for Infinity Polydome K (902-3075).  Ferrofluid cooled, 80 Watts RMS/115 Max, 8 ohms, Freq 700-6Khz, Overall Diameter 5 15/16", Cutout Diameter 4 9/16"

See pictures below for side by side comparisons with the Infinity Polydome K