Abstract
The AO projector is a WWII British Admiralty minesweeping source that operated at 230 Hz with a source level of about 198 dB re/μPa at 1 m. Being virtually indestructible, many still exist in operating condition. To improve their utility as research sources, three AO's have been modified to resonate at 110 Hz. A SCUBA pressure compensation system has been installed to extend their operating depth capability. The source level at resonance is displacement limited to 195 dB and a current‐limited, broadband source level of at least 182 dB is available above resonance up to the diaphragm breakup at 700 Hz. The modification method will be described and performance predictions given for a modified AO with an 80‐Hz resonance.
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