Mentor has released 5.1 surround sound headphones in Australia. The system works with PCs, Macs, DVD players, gaming consoles and digital TVs. The headsets in the Mentor range surround each ear with six independent chambers, creating the sensation that each sound is coming from a particular direction, according to the exclusive distributor Conexus. Mentor headphones also include Safebass technology. This protects the listener’s ears by combining audio signals from the right-front and left-front audio channels and converging the bass signals into a more moderate level. The headsets provide a front, centre and surround impedance of 32, 16 and 8ohm respectively. Their frequency response is 20hz to 20Khz, and their sensitivity is 103db. The professional headset for PC users is the Mentor RCH120. It provides three stereo plugs and a USB connector, enabling it to connect to any desktop or laptop PC that has USB 1.0 or later (providing power) and a sound card (providing audio-in). The driver software runs on Windows 98SE, ME, 2000 or XP. The headphone has an estimated retail price of $249. The deluxe version of this headset is the Mentor RCH125. It has an estimated retail price of $219. The professional headset for Mac or PC users is the Mentor RCH100. It provides a built-in AC97 decoder, so the computer does not need a sound card — just a USB connector, which provides both power and audio-in. The driver software runs on either Mac OS X or Windows 98SE, ME, 2000 or XP. The headphones have an estimated retail price of $259. The deluxe version of this headset is the Mentor RCH110. It has an estimated retail price of $239. The professional headset for DVD players, digital TVs, the Xbox and PlayStation 2 is the Mentor RCH001. It provides a fibre-optic or coaxial cable for connecting to a range of devices, as well as a wireless remote control and a built-in amplifier/decoder. It has an estimated retail price of $299. Optional second headphone sets are $115 (in the professional form factor) or $85 (deluxe).