Soundtube RS400i-WH Hanging SpeakerSoundTube RS400I Hanging Speaker in White The RS400i has a 4 inch polypropylene woofer and one 1. 0 inch convex titanium tweeter with FerroFluid cooling mounted to a proprietary cast aluminum baffle and heat sink. The two way, ported speaker with an open ceiling enclosure design that delivers effective low end response (76 Hz) and 125 off axis performance (2 to 10 kHz, independently verified). The speaker uses patented ZeroReflection enclosure
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