Pioneer TS-A1683R 4-Way Speakers-6.5-Inch (Discontinued by Manufacturer) 6-1/2-inch, four-way speakers with 280 watts maximum power handling (50 watts nominal) Woofers feature carbon graphite IMPP interlaced aramid/basalt fiber cone with polymer surround 3/4-inch soft dome midrange, 3/8-inch PET film dome tweeter and supertweeter Heat-resistant polyester-imide resin voice coil wire for improved power handling 36 Hz to 28 kHz frequency response with 91 dB sensitivity