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THE WORLD'S MOST POWERFUL SUBWOOFER.
All ServoDrive loudspeakers incorporate a unique,
patented operating principle involving the substitution of high-speed rotary
servo-motor and belt-drive system for the traditional loudspeaker voice
coil/magnet transducer system. The concept was created by renowned engineer,
Thomas Danley. In the years since their
introduction, ServoDrive subwoofers have heightened
the awareness of the tremendous effect massive low frequencies have in both
fixed installations and touring sound applications.
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ServoDrive's BassTech 7s provide
more sound pressure level capability than any other subwoofer on the market. Features
include: exceptionally low harmonic distortion, true high-fidelity
performance, virtually no output loss due to power compression, frequency
response virtually flat to below 28Hz, extraordinarily efficient - low power
requirement for full SPL output. The BassTech 7s
display smooth frequency response (essentially flat from crossover frequency
down to 28Hz). Revolutionary motor-driven belt design increases linear
excursion and efficiency, handles large low-frequency peaks without damage or
sonic compromise.
The BassTech 7s have been on tour with the Rolling Stones, Michael Jackson,
U2, Garth Brooks, Phish,
and Lyle Lovett. From Super Bowl half-time shows, to Disney World, Universal
Studios, the Mirage Volcano, Buccaneer
Bay at Treasure
Island, Crystal Cathedral, and Blumenthal Theater - wherever
crowds gather, these subwoofers are guaranteed to bring a new level of
excitement!
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Compare
this
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to...
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This
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9 - High Quality Dual 18" Driver, Vented Box
Subwoofers
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4 - ServoDrive BassTech 7,
Servomotor Driven, Horn Loaded Subwoofers
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Required Power = 5400 Watts
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vs.
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Required Power = 1600 Watts
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Frontal dimension = 108" x 108"
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vs.
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Frontal dimension = 45" x 96"
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System weight = 2000 lbs.
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vs.
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System weight = 920 lbs.
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Truck packing volume = 189 cu. ft.
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vs.
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Truck packing volume = 105 cu. ft.
(ideal truck packing
dimensions)
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Amplifier dollars = 4,320.00
(at 80 cents / watt)
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vs.
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Amplifier dollars = 1,280.00
(at 80 cents / watt)
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Harmonic distortion = 2% to 20%
(typical at full
rated power)
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vs.
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Harmonic distortion = 0.5% AVG. to 1.5% MAX.
(measured at full
rated power)
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Power compression = 4dB to 6dB
(typical at full
rated power)
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vs.
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Power compression = LESS THAN 1.5dB
(typical at full
rated power)
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Sound level at ten meters = 122dB
(measured at full
rated power before power compression)
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vs.
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Sound level at ten meters = 124.5dB
(measured at full
rated power)
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Amplifier Capacity
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Continuous Power
(per modified AES procedure, 24 hrs.)
Musical Peak Power Capacity
(<15 seconds)
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400 Watts RMS
800 Watts RMS
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Power Compression
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Full power after 15
minutes
2x full power after 15 seconds
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<1.5dB
<2dB
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Nominal Impedance
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4 Ohms
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Sensitivity
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Spectrum (28-125Hz)
(1/2 space, groundplane)
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2 units - 107.5dB (1W, 1m)
4 units - 110.0dB (1W, 1m)
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Sound Pressure Level
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Full Rated Power
(28-125Hz)
(1/2 space, groundplane)
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2 units - 136dB
4 units - 142dB
(Peak SPL: +3dB)
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Low Frequency Corner
(-3dB)
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2 units - 30Hz
4 units - 28Hz
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Distortion, Full
Rated Power
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Second Harmonic,
28-125Hz
Third Harmonic, 28-125Hz
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<1% typical
<1% typical
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Radiators
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2-15" pistons
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Maximum
Excursion/Driver
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>1" peak-to-peak linear excursion +3dB excursion
headroom at 400 watts/30 Hz
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Crossover Slope
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Recommended
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>18dB per Octave @ <125Hz
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Dimensions &
Weight
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45" x 45" x 22.5" - 230 lbs.
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Finish and Features
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Black "TNT" indoor-outdoor carpeting
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Enclosure
Construction
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•14-ply Baltic Birch with extensive bracing
•27 Hz Hyperbolic Flare T=.55
•Horn Length 10.6 feet
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Horn Throat
Compression Ration
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3.4 to 1
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Connectors
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Neutrik "Speakon"
or EP4
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Options
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•Dolly Tray
•Custom Connectors
•Custom Handles
•Painted (Texlac)
•Fiberglass
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