The BIGGEST SPEAKER of the WORLD
The higher efficiency ever obtained without distortion
Roberto Delle Curti, Royal Device designer, reveals how it has been possible to make The BIGGEST SPEAKER of the WORLD for the GREATEST AUDIO ROOM of the WORLD
The two frontal speakers (left and right) are made of 8 LAURA speakers per channel ( see LAURA) with a total of 16 floorstanding loudspeakers. This configuration, together with The NO-CROSSOVER choice makes a BIG MONOWAY speaker that reproduces frequencies from 30 Hz to 6-7 Khz. The range from 10 to 30 Hz is reinforced bu the BIGGEST HORN SUBWOOFER of the WORLD while the HIGH FREQUENCY range is integrated by the exclusive wood RD-HORN that do not use ANY FRONTAL PHASER. The total system sensitivity is 110 dB/1 Watt/1 meter giving the possibility to reproduce sound levels at 6 meters away much higher than live concert pressure levels ( the electrical medium power output is in this case roughly 0.5 to 1 Watt), without distorsion and without getting annoing listening at all.
Any LAURA speaker has a Hi-efficiency 21 cm (8.5") CUSTOM WOOFER back loaded (the system uses a particular horn Royal Device horn loading that reduces speaker cabinet dimensions and reproduce a better low frequency responce in respect to Labirynth systems). Each woofer has a frontal mechanical filter.
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The EXTERNAL part of the TOTAL speaker is similar to a big driver that reproduces the Extremely BASS Audio range. In this case the speaker is made by all the 8 output mouths of the LAURA speakers (in elliptical configuration), improved by the side exponential frontal loading made by the side panels plus the ceiling and floor loading. The final speaker must be also considered in the TRI-DIMENSIONAL way. |
The CENTRAL part of the TOTAL speaker is similar to a big driver that reproduces all the: LOW-MID, MID e MID-HI range of the audio spectrum. In this case the driver is made by the 8 frontal woofers (in ellitptic configuration), improved by the side loading made by the side exponential panels ( dotted lines). Also in this case the final speaker must be considered in the TRI-DIMENSIONAL way. |
The INTERNAL part of the speaker is made by the exclusive Royal Device wood RD-HORN with NO FRONTAL PHASER mechanically phase aligned with the 8 woofers but mechanically disengaged from the LAURA speakers. The RD-HORN reproduces the HI-RANGE up to 20 KHz. |
See photos below and click for
The AUDIO room is 6.95 x 8.70 meters. Front LEFT + RIGTH speakers are 8 x LAURA speakers per channel ( see LAURA) with a total of 16 loudspeakers.
Lauras are placed in Delle Curti configuration.
Only one RD-HORN will be working in the middle of the 8 speakers for high frequencies reproduction.
On the sides of the speakers two exponential wood panels (2.2 meters high with more than 1 meter width) increase the total efficiency of the system.
SUBWOOFER horns are built underneath the floor in a cavity 1 meter deep. Each horn is driven by 8 x 18" (45 cm) woofers. A total of 16 woofers.
Each horn is 9.5 meters long and has a mouth area of 2.2 square meters and reproduce frequencies starting from 10 Hz FULL POWER.
A central channel made by 4 LAURA is used in the same Delle Curti configuration.
All amplifiers and CD players are placed into a 90 x 90 cm hole completely decoupled.
Rear channels with same speakers.
Total efficiency: 110 dB/1 watt/1 meter
FRONT CHANNELS AND CENTRAL CHANNEL TUBE AMPLIFIERS:
- 2 stereo amplifiers made by 6B4 Push-pull - NO FEEDBACK - For Royal Device custom design and manufacturing. 12-17 Watts/channel in MULTI-BI- Amplification manner toward the Hi-Horn. These two amplifiers feed the 16 frontal right and left channels, plus the 4 central channel speakers.
- 1 tube 1,7 Watt single ended amplifier - NO FEEDBACK for the left, right and central HIGH HORNS. Horns are Royal Device RD-HORN in solid cherry wood and NO frontal PHASER
SUB-WOOFER AMPLIFIERS:
2 x MONO AMPLIFIERS
Acoustic treatment on ceiling and walls made in different and several ways to extremely reduce resonances below 200 Hz of the room wall and ceiling (standing waves).
Anechoic Back Wall to completely avoid backwall reflection.
SUB-WOOFER Compression chamber closure ( 120 Kg on 3,6 mq) are held and reiforced by an extra weight of 600 Kg. Total closure weight 720 Kg.
Speakers and listening position designed for best results
Acoustic level at listening position (6 meters from frontal speakers) are 100 dB with 1 Watt.
Acoustic level reproduction can rise easyly above real play with No distorsion.
Frontal and deep perspective perfectly matching with real play
All frequencies from 30 to 5000 Hz are reproduced by speakers with NO-CROSSOVER in a full range modality. This give no nasal twang at all.
Royal Device AUDIO Room
Here is where real music and emotions live
Aliante s.r.l.
Viale dell’Industria 19
21052 Busto Arsizio (VA), ITALY.
Tel. +39 0331 354070
Fax. +39 0331 342445
e-mail: aliante@royaldevice.com