Dynamic Bass Sound - Powerful Bass-reflex Subwoofer with 20cm Big Woofer This model features a large, newly developed bass reflex subwoofer. Compared with conventional models, the new bass-reflex subwoofer has approximately 1.5 times the volume, and the subwoofer speaker unit has been increased to 20 cm. The size of the speaker magnet has been doubled for the large subwoofer, and enlarged as well for the center, front and rear speakers, to allow finer, faster movement of the diaphragm for more powerful bass. High Quality Picture - HDMI 1080p Up-Conversion High-quality images can be enjoyed. This features a 1080p Up-conversion function that converts standard-definition images (720?576 pixels) from DVD sources into high-definition images (1920?1080 pixels). These up-converted signals maximize the performance of HD flat screen TVs, providing vivid, sharp and exceptionally detailed high-resolution images. Selectable Speaker Layout - 5.1ch Surround Layout / 5.1ch Front Layout The Panasonic DVD Home Theaters are easy to install and simple to operate. All models offer a Selectable Speaker Layout that allows the speakers to be placed in front of the listening position for a surround sound effect. The layout can be selected to match the living room.