Elektrik 9119 · Active Equalisation: Raising the sound pressure level

Elektrik 9119 Active Equalisation: Raising the sound pressure level: This Bose patented system is individually To play back bass notes deep and full, suffi- adapted to the interior acoustics of each cient sound pressure must be generated. Porsche and guarantees a balanced and Standard solutions with huge heavy woofer clear tone across the whole frequency spec- loudspeakers move the necessary large vol- trum. umes of air. As this could not be an appro- It creates an environment in which the lis- priate solution for a sports car, we have con- tener can enjoy music playback, without structed made-to-measure loudspeaker constantly having to re-adjust the controls. housings. These bass reflex technology This is only possible on systems especially housings have two great advantages: developed for specific cars, as acoustic A low convincing bass with impact in the measurements are taken, analysed and in- whole interior and avoidance of vibration, corporated during the development process. whereby the air volume to generate the lower frequencies is moved by so called resonance tubes.Active compressor switching: This ensures precision fine tuning of the With this series of technical innovate solu- dynamic range of the music. Even during tions the BOSE sound system in the Porsche loud sections, the system allows no audible is convincing with its unique, pure and origi- distortions. The tone is always pleasant to nal sound. the ear. Arrangement of components BOSE sound system 911 Turbo Audio electronics 1 Bose patented TSM switching (on front bulkhead) amplifier (TSM = two state Bose signal processing for spa- modulation) tial tone and distortion-free sound at every volume 5 Linear amplifiers, 5 x 25 watts 6 channels for made-to- measure equalisation High-performance loudspeak- 12 ers Dash panel 2x 8.9 cm midrange units 2x 4.3 cm tweeters Doors 2x 11.4 cm woofer/mid-range speakers in 5.5 litre bass reflex housing Rear side panelling 2x 8.9 cm midrange units 2x 4.3 cm tweeters Behind rear backrests 2x 13.3 cm woofers in 13.8 litre bass reflex housing 9 - 26 Service Information 2002