Overview You must have JavaScript enabled and Flash 9.0.115 to see this content. Boston Acoustics SPG555. 6½" copolymer cone woofer with neodymium magnet 1½-inch voice coil RadiaVent® cooling and Twinstage™ heat sink for increased power handling Cast aluminum woofer basket 1" Type-M1 anodized alloy dome tweeter with full AMD™ Separable and dockable crossovers VariMount™ adapter rings allow for fast installation Axis-, flush-, and angle-mount tweeter mounting kit Specifications Nominal Impedance 3 ohm Mounting Depth 2-3/8" (60mm) Frequency Response (±3dB in car) 50Hz-22kHz System Type 2-way Speaker Size 6-1/2" Rated RMS Power Handling 125 watts Mounting Cutout Diameter 5 1/4” (133mm) Mounting Depth with Spacer 2-1/16" (52mm)