6x9 three-way speaker JBL engineers designed the GTO 939 speaker to produce strong clear sound from a head-unit or amplifier capable of delivering up to 300 watts of power This makes the GTO 939 an ideal match to systems powered with head-unit or factory-amplifier power levels or even with many of the GTO Series amplifier combinations to help keep up with systems that feature one or more subwoofers And its great power-handling specifications also increase reliability over the lifetime of the speaker Standaard meegeleverd 2 GTO 939 loudspeakers 2 protective grilles Ownerrsquo;s installation manual