Driverside Rear door speaker is buzzing... Time to upgrade the rears! Going 6x8s again. Have the Rockford Fosgate Punch P1683 in the front doors. Highs and Mids are great, but no bass to speak of. Rockford Fosgate Punch P1683 6"x8" 3-way car speakers at Crutchfield.com Looking at either Pioneer or Infinity now. Pioneer TS-A6885R 5"x7"/6"x8" 4-way car speakers at Crutchfield.com Infinity Reference X REF-8602cfx 5"x7"/6"x8" 2-way car speakers at Crutchfield.com Leaning towards the Pioneers since they're 4-way, lower Frequency Response, and higher (350 vs 180w) peak power rating.