SoundTube IW500B In-Wall Speaker System w/BroadBeam Tweeter - 5.25" (White)The IW500b has a 5. 25 inch polypropylene woofer and one 1. 0 inch convex titanium tweeter with FerroFluid cooling mounted to an aluminum motorboard. The speaker is a coaxial, in wall loudspeaker that delivers effective low end response (69 Hz, 10 dB) and optimal off axis performance (2 to 10 kHz, independently verified). SoundTube's proprietary BroadBeam waveguide tweeter system delivers consistant high performance audio across the operating