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voici le lien à visiter pour en savoir plus: https://www.royaldevice.com/custom3.htm
Citation
The Biggest SUBWOOFER of the WORLD, for the most esoteric Audio and AUDIO-VIDEO Room of the World. The Highest efficiency ever obtained with NO distortion using NO feedback tube low power amplifiers and NO crossover on the speakers
Royal Device has on its own developped and built the biggest subwoofer of the world for an AUDIO/VIDEO room that can be also considered as the biggest AUDIO ROOM for private music listening of the world. The audio reproduction is focused on the speakers output capability more than electric power output of the amplifiers with no need of KWatts power supply lines, releasing more than 110 dB/1W/1 meter sensitivity starting from below 10 Hz focused on the listening position.
The AUDIO room is 6.95 x 8.70 meters.
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SUBWOOFER horns are built underneath the floor in a cavity of 1 meter deep. Each horn is driven by 8 x 18" (47 cm) woofers. A total of 16 woofers.
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Each horn is 9.5 meters long and has a floor mouth area of 2.2 square meters and reproduce starting from 10 Hertz FULL POWER. The real mouth area IS NOT the one on the floor. The real mouth have to be considered together with the side vertical frontal panel. The total horn is calculated onto the listening point considering the side walls and the ceiling loadings. This reduces the floor mouth that is not in open air.
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Total efficiency: more than 110 dB/1 watt/1 meter. The total electrical capability of the 16 woofers is about 400 Wrms power per woofer that means about 400 x 16 = 6400 Wrms total. Each woofer features a 100 mm coil. The real maximum power fed to both subhorn measured with an oscilloscope at the highest musical peak roughly reaches 6 watts per channel. In this conditions, peak levels are much higher and undistorted than any live concert at all. Walls and ceiling seems to fall down, but don't. The sound pressure is concentrated at the listening point and stopped by a 2 meters high woolglass anechoic wall on the back of the listening position.
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SUB-WOOFER Compression chamber closure ( 120 Kg on 3,6 mq) are held and reinforced by an extra weight of 600 Kg. Total closure weight 720 Kg.
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Acoustic level at listening position (6 meters from frontal speakers) are 100 dB with 1 Watt.
On y apprend, entre autres, que la raison d'avoir de si grandes dimensions est de descendre bas en fréquence : 10Hz 
C'est l'install d'un passionné de haut rendement. Il ne faut pas s'y tromper, les amplis ont été choisis en fonction des caractéristiques de l'enceinte (les 16 woofers + leur charge en pavillon). Si les amplis ne sont pas puissants c'est qu'il n'ont pas besoin de l'être pour atteindre une pression accoustique (il font quand même 12W par canal ce qu'un fabricants d'ampli "classique" nous vendrait certainement comme du 150W  )
Citation Acoustic level at listening position (6 meters from frontal speakers) are 100 dB with 1 Watt.
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07-09-2004 23:09
et surtout sa déco intérieure, top classe 
