Loudspeakers and Headphones a Tutorial on Cone Vibration and Sound Radiation Diagnostics g www.klippel.de SPL [dB] 80 70 60 50 40 30 20 www.klippel.de Wolfgang Klippel Institute of Acoustics and Speech p Communication, , TU Dresden KLIPPEL GmbH PERFORMANCE 270 300 240 330 210 Total Sound Pressure Level 103 104 Frequency [Hz] 0° 180° 30° -20 -10 150° 60° 120° 90° Tutorial: Cone Vibration and Radiation Diagnostics, AES London 2010, 1 Our Topic Today Dust cap DESIGN (geometry, material) cone Relationship ? spider Voice coil • What limits the usable frequency range ? • What causes peaks and dips in the SPL response after break-up ? • How to measure the mechanical vibration ? • Which mechanical modes are beneficial which are not ? • How to cope with vibration and radiation problems ? • How to get smooth responses, optimal directivity and low distortion ? Tutorial: Cone Vibration and Radiation Diagnostics, AES London 2010, 2 surround Simulation by Ulrik Skov