The VLFTAPS system was developed for the University of Washington and the Naval Oceanographic Office, and is the successor to the LFTAPS system developed by EAI's principles. The system comprises a back-to-back pair of moving-coil projectors with 18 inch diameter radiating pistons and Neodymium Iron Boron magnet assemblies with a 16 inch diameter radial gap with an average B-field over the coil in excess of 1.3T.

The system is integrated into a cylinderical tow fish, and is designed to operate over a 5 to 200 Hz frequency range at source levels up to 185 dB re 1 uPa/V, and be towed at depths to 100 meters at speeds up to 10 knots. These projectors utilize a number of innovative features which include: a shaped piston, linear bearings operating in oil, and a low conductivity composite coil former offering excellent thermal conduction properties.

Engineering Acoustics, Inc.