Sennheiser is one of the biggest names in high end headphones, and one thing that really makes these headphones stand out is an amplifier. Sennheiser has just announced the HDVA 600 analog headphone amplifier, specifically targeted at users of the HD 600 and above headphones. This amp joins the digital HDVD 800 amp that was introduced a few months back. A snazzy looking case features a window to allow users to take a look at the electronics that power the amplifier. The HDVA 600 will retail for $1,600 and the HDVD 800 will sell for $2,000. Both are expected to be available in the United States in the fall, and will "be on display at CanJam at the Rocky Mountain Audio Fest in Denver, CO between October 12th and 14th."