MB Quart Formula FTA169 6 x 9" 3-Way Speaker System 6 x 9" 3-Way Speaker System with 50-120 Watt Power Rating and 37Hz-32kHz Frequency (Sold in Pairs) Two-piece 0.75 (19mm) tweeter with titanium-coated dome Rugged stamped metal chassis with a polypropylene cone for structural rigidity Spider with woven tinsel leads for high power Formula crossover with small chassis; Surface and flush mount tweeter enclosures