The World's Biggest Subwoofer

kavinele · kavinele Fri 1 Jan 2010 - 23:01

The World's Biggest Subwoofer

Royal Device has on its own developped and built in Italy the biggest
subwoofer of the world for an Audio/Video room that can be also
considered as the greatest AUDIO ROOM for private music listening
of the world. The Royal Device audio room belongs to Roberto - the
audio designer who made it.
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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.
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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.
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 panels. 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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The SUBWOOFER efficiency is 120dB/ 1 Watt/1 meter. So the need of
external regulation to adapt to the remaining audio system. The total
electrical capability of the 16 x 48 cm woofers is about 400 W peak
power per woofer that means about 400 x 16 = 6400 W peak total
(practically uselss). Each woofer features a 100 mm coil. The real
maximum power fed to both subhorn measured with an oscilloscope at
the highest musical peak was 6 watts per channel when a pair of tube
amps were used to drive the 16 LAuras, while up to date the electric
power can reach 60 watts per channel using the 4 x 50watts/ch BLU
EYES amps. In this conditions, peak levels are much higher and
undistorted than any live concert at all. Walls and ceiling seems to fall
down, but fortunately 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. We should remember that the total
diaphragm surface of the woofers is 2.89 square meters (8.67 square
feet) and with the drivers horn loaded (not direct radiating), distortion
at 60 watts is practically negligible. If for instance the real maximum
rated power (6400 watt) would be used the pressure level would reach
160 dB, but I wonder who could survive. Not even the house built in
steel & concrete maybe would stand up.

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.
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 panels. 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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