Dolby Laboratories and Lake DSP of Sydney, Australia, will jointly develop a new multichannel surround sound technology for headphones. Named Dolby Headphone, the new DSP-based system will allow headphone listeners to hear the full 5.1-channel surround capabilities of modern film sound mixes. Call Dolby at 415/558-0200 or visit www.dolby.com or www.lakedsp.com...Koss intros a 40th anniversary edition of the famed PRO4/AA Stereophone, in a limited run of 1,000, featuring a dynamic element and closed cushion design. Price is $99.99. Call 414/964-5000...ATM Fly-Ware offers a rigging system for the EAW KF700 series of loudspeakers. Each truss module in the AMFS-KF700-T system weighs 74.5 lbs, complies with ASME B30.20, CE and VBG 70, VBG 9a standards and has a weight load limit of 2,100 lbs. Call 310/834-5914...Electro-Voice redesigned its venerable Eliminator two-way loudspeaker system. It's now loaded with an EV DL15BFH 15-inch woofer and an EV DH2010A compression driver in a High-Q 60degreesx40degrees constant directivity horn, for a frequency response of 50-20k Hz. Constructed of EV's RoadWood, the system features the easy-lift handles designed for the X-Array system and weighs 66 lbs. Call 616/695-6831 or 616/695-1304...Neutrik's new 48-page product guide catalog lists approximately 550 model numbers and includes product features, dimensional drawings, part numbers, special versions, specifications and technical data. Call 732/901-9488 or visit www.neutrikusa.com...Music Interface Technologies (MIT) has reduced prices on the company's RIPCORD and GAS instrument cables by an average of 20% to 40%. Call 530/ 823-2600...ADK Inc. has added the A-51sd (switchable dual-pattern) omni/cardioid large-diaphragm studio condenser to the company's A-51 microphone family. ADK also announced that it will expand its line of products later this year, adding a multipattern version of the A-51 and an all new ADK large capsule tube microphone. Call 503/772-3007.