A new low-frequency loudspeaker driver is presented which overcomes many deficiencies of traditional voice-coil drivers. This driver incorporates a low-inertia DC servomotor to provide large, linear excursion. The electroacoustic circuit model and the corresponding Thiele-Small parameters are developed for the servomotor driver and are compared to the voice-coil drivers. Although servomotors possess some inherent nonlinearities at low levels, the overall behavior is linear, especially at large amplitudes when voice-coil drivers are nonlinear. An array of six horn-loaded servomotor loudspeakers has an efficiency exceeding 40% and delivers more than 900 acoustic watts between 31 Hz and 125 Hz.
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is free for AES members and E-Library subscribers.