DESC: Yamaha's NS-333 speaker system has been designed specifically for home theater applications. The bookshelf speaker is a bass-reflex design that can be used for main or surround channels and incorporates a 5" Polymer-Injected Mica Diaphragm (PMD) cone woofer and a 1" aluminum dome tweeter. For improved imaging, the tweeter utilizes Yamaha's exclusive waveguide horn.