<font color='#0000FF'>http://www.yamaha.co.jp/english/product/av/products/hf/mxd1.html and for more details but in Japanese with internal pictures go to http://www.yamaha.co.jp/product/av/prd/mxd1/mxd1_01.html This is a real high end class D MOSFET amp withy Yamaha's own DMOSFET chips used in their high end electronic musical instruments. Maybe I will cancel my Z-9 purchase and buy this one instead. </font>