Since 1994, the HPS-4000Æ motion picture sound system has become the standard for the National Park Service theatres. The selection of the HPS-4000 system followed an extensive evaluation in which loudspeakers from over 20 different manufacturers were tested and auditioned.The first installation of an HPS-4000 system in a National Park Service facility was in Salem, Massachusetts. Later installations followed in San Antonio, Texas, Scranton, Pennsylvania, the USS Arizona Memorial at Pearl Harbor in Honolulu, Hawaii and most recently at Great Smoky Mountain National Park in Gatlinburg, Tennessee.In recent weeks, the Park Service has begun working with High Performance Stereoô on five new projects including four new theatres. A new captioning and descriptive video system developed at Boston's WGBH will be installed in the two existing theatres at the USS Arizona Memorial. The four new theatres will be in Alaska, California and two in Dayton, Ohio.In addition to the installations of the HPS-4000 sound systems, High Performance Stereo will also be responsible for creating the final print masters for each of the new programs that will be produced for the theatres. This step ensures that the soundtracks for every program exhibited in a National Park HPS-4000 theatre will be of the highest quality. The HPS-4000Æ sound system is installed in many of the best presentation cinemas around the world and is considered by many as the finest sound system ever developed for motion picture theatres.