Ascendo The24 SUB PRO PASSIVE SEALED 24″ infra-subwoofer IKKE-PORTET

SKU: The24SubPro
199 999,- inkl. mva


250 × 300 × 200 cm


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The24 SUB PRO PASSIVE SEALED infrasub is a statement.

Its huge cone surface area and huge 90 mm of linear stroke - represents a world record for cinema subwoofers - allow it to move a gigantic volume of 10 liters of air per stroke to pressurize the room. Due to its ultra-low resonance frequency and its sealed enclosure design the group delay is several times faster than the smaller 18", 15" or 12" subwoofers at the same frequency. Also the acoustic power output per cubic inch is by far in favour of this unique design compared to stacked multiple smaller subwoofers.

Its ingenious design allows the The24 SUB PRO to produce frequencies in the infrasonic frequency range with authority, reaching down lower than subwoofers with a smaller diaphragm surface ever will. At the same time this infrasub renders those notes with much more power, structure and resolution.

The The24 SUB PRO ideally suits not only all types and sizes of cinemas, but also high-end stereo systems. Much of the spacial room information of the recording envirnment in a great audiophile recording is contained in the sub 30Hz audio band. You will hear more details in mid and high frequencies.


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Speaker type 24″ forward-firing woofer, with dual 5″ voice coil
Xmax 45 mm excursion each direction (90 mm linear), voice coil remaining in homogeneous magnetic field, linear and lowest distortion
Passive | Active Passive
Recommended amplifiers 2 Amp. channels are required. minimum recommended amplifier voltage swing:  2 x 109 Vrms, 154 Vpk, 27,3 A; equivalent to 3000W@4Ohms per channel, total 6000W with correct RMS & Peak limiter settings (up to 450V = 20kW peak)
Recommended ASCENDO amplifiers DSP4-10K2
Principle Sealed
SPL (Peak / half space 2 pi) Measurement data
140 dB @32Hz and up
120 dB @20 Hz
104 dB @10 Hz
Frequency range “Measurement Data (without ext. DSP)
28 Hz – 500 Hz /   -3 dB
20 Hz – 500 Hz / -15 dB”
 Efficiency 90 dB  / 1W/m
Power handling 2 x 2500 W
Impedance Dual voice coil, 4 Ω each
Air volume displacement 9,9 L / in comparison 18″ standard cinema subwoofer 1,1 L
Directivity horizontal x vertical in Deg° 360°
Input terminal Neutrik NL4 MP
Enclosure Internally braced birch ply and MDF
Width 29,53 ” | 750 mm
Hight 43,31 ” | 1100 mm
Hight with feet 44,29 ” | 1125 mm
Depth without grill 19,69 ” | 500 mm
Depth with plug 19,69 ” | 500 mm
Weight 255,74 lbs | 116 kg
Finish Structural paint black
Custom colour options Piano lacquer, colour of choice, matt or other finishes upon request
Shape customization Upon request
Mounting Floor standing with feet


Technical modifications subject to change without further notice