The World's Biggest Subwoofer

Royal Device has on its own developped and built in Italy the biggestsubwoofer of the world for an Audio/Video room that can be alsoconsidered as the greatest AUDIO ROOM for private music listening ofthe world. The Royal Device audio room belongs to Roberto - the audiodesigner who made it.

The audio reproduction is focused on thespeakers output capability more than electric power output of theamplifiers with no need of KWatts power supply lines, releasing morethan 110 dB/1W/1 meter sensitivity starting from below 10 Hz focused onthe listening position.





































































SUBWOOFERhorns are built underneath the floor in a cavity of 1 meter deep. Eachhorn is driven by 8 x 18" (47 cm) woofers. A total of 16 woofers.
Eachhorn is 9.5 meters long and has a floor mouth area of 2.2 square metersand reproduce starting from 10 Hertz FULL POWER. The real mouth area ISNOT the one on the floor. The real mouth have to be considered togetherwith the side vertical frontal panels. The total horn is calculatedonto the listening point considering the side walls and the ceilingloadings. This reduces the floor mouth that is not in open air.

TheSUBWOOFER efficiency is 120dB/ 1 Watt/1 meter. So the need of externalregulation to adapt to the remaining audio system. The total electricalcapability of the 16 x 48 cm woofers is about 400 W peak power perwoofer that means about 400 x 16 = 6400 W peak total (practicallyuselss). Each woofer features a 100 mm coil. The real maximum power fedto both subhorn measured with an oscilloscope at the highest musicalpeak was 6 watts per channel when a pair of tube amps were used todrive the 16 LAuras, while up to date the electric power can reach 60watts per channel using the 4 x 50watts/ch BLU EYES amps. In thisconditions, peak levels are much higher and undistorted than any liveconcert at all. Walls and ceiling seems to fall down, but fortunatelydon't. The sound pressure is concentrated at the listening point andstopped by a 2 meters high woolglass anechoic wall on the back of thelistening position. We should remember that the total diaphragm surfaceof the woofers is 2.89 square meters (8.67 square feet) and with thedrivers horn loaded (not direct radiating), distortion at 60 watts ispractically negligible. If for instance the real maximum rated power(6400 watt) would be used the pressure level would reach 160 dB, but Iwonder who could survive. Not even the house built in steel &concrete maybe would stand up.

SUBWOOFER horns are builtunderneath the floor in a cavity of 1 meter deep. Each horn is drivenby 8 x 18" (47 cm) woofers. A total of 16 woofers.
Each horn is 9.5meters long and has a floor mouth area of 2.2 square meters andreproduce starting from 10 Hertz FULL POWER. The real mouth area IS NOTthe one on the floor. The real mouth have to be considered togetherwith the side vertical frontal panels. The total horn is calculatedonto the listening point considering the side walls and the ceilingloadings. This reduces the floor mouth that is not in open air.

Source: royaldevice