WHY: At ASCENDO, we believe that the pursuit of the highest-quality sound is more than just a technical goal—it’s a deeply emotional journey. The THE21 SUB PRO ACTIVE VENTED is designed for the discerning listener who knows what true audio excellence feels like. This subwoofer isn’t just about power; it’s about the visceral thrill of hearing every note, every low-frequency impact, with a clarity and depth that transports you to another world. For those who demand perfection, the THE21 SUB PRO is the final piece to elevate their audio experience to unprecedented levels.
HOW: From the first deep rumble to the finest low-end detail, THE21 SUB PRO reveals a new dimension of sound. Its vented design and carefully tuned 25 Hz frequency deliver bass that isn’t just heard—it’s felt deep in your chest, creating an experience that’s as much about sensation as it is about precision. Yet, even with its massive power, this subwoofer maintains a sense of control, producing incredibly tight and musical bass that can switch direction effortlessly.
The advanced double-gap motor system ensures a more linear motion and lightning-fast response, delivering deep, authoritative bass without sacrificing clarity or musicality. You won’t just hear the notes—you’ll feel them. And thanks to our commitment to transparency, you can trust that the published measurements from third-party labs match the performance you experience in your own space.
WHAT: THE21 SUB PRO is a sonic marvel—a subwoofer that pushes the boundaries of what’s possible with a 21-inch driver. With an integrated 3 kW amplifier and 6 kW power supply, this sub effortlessly handles even the most demanding musical and cinematic moments, delivering breathtaking output levels with ease.
Whether you’re immersed in the rumble of a movie’s lowest frequencies or lost in the musicality of your favorite tracks, every detail is revealed with stunning clarity. When paired with our infrasonic subwoofers, THE21 SUB PRO transforms your system into a powerhouse that delivers perfect bass all the way down below 20 Hz, with the same precision and musicality you would expect from ASCENDO.
To unlock its full potential, we recommend pairing the THE21 SUB PRO with our custom-designed amplifiers—because great bass deserves nothing less.
Specification
General
Speaker Type: 21” forward-firing, dual gap motor structure with 2 inner and 2 outer voice coiles, neodymium moto
XMAX: 17.5 mm excursion each direction (35 mm linear), voice coil remaining in homogeneous magnetic field, linear and lower distortion
Principle: Vented
Passive | Active: Active, built in DSP Amplifier
Measured Data
SPL Peak (Peak / Half Space 2pi): Measured Data 142 dB @ 62 Hz
Frequency Range: Measured Data (Without DSP) 30 Hz - 400 Hz / -3 dB 22 Hz - 500 Hz / -12 dB
Directivity Horizontal x Vertical in deg°: 360°
Power Specifications & Features
Output Power: 3000 W
Power Supply Requirements: 100-240 VAC, 50-60 Hz (Operating: 90-265 VAC)
Power Consumption
230 VAC - 1/8 rated power (4 Ohm)
3.2 A / 490 W
120 VAC - 1/8 rated power (4 Ohm)
6.2 A / 490 W
Idle: 0.5 A / 61 W
Automatic Power Off
Trigger
Connections
Input: 1 x XLR Balanced
Output: 1 x XLR Balanced Link
Power: Neutrik powerCON True 1 in-out
Communications: 2 x RJ45 / Daisy Chain
Signal Processing & Control
Protection Features: Turn-on transients, Over-heating, DC, RF, Short-circuit, mismatched loads, ICL™, PMS™
Controller: OCS Software Control
Converter: High Performance 96 kHz / 24 bits AD/DA converters, 64 bit double-precision 96 kHz DSP process
Input IIR EQ Section: Gain, Mute, Phase inversion, Delay (up to 116 ms, 40 m), 10 EQ filters (Parametric, Shelving, LP, HP, BP, SB, AP)
Dimensions & Weight
Dimensions (W/H/D) mm (Without Grille): 600 | 1124.5 | 500 (Height without feet: 1100) (Depth with plug: 530)
Dimensions (W/H/D) inch (Without Grille): 23 5/8 | 44 1/4 | 19 11/16 (Height without feet: 43 1/3) (Depth with plug: 20 7/8)
Packing Dimensions (W/H/D) mm: 680 | 1280 | 600
Packing Dimensions (W/H/D) inch: 26 7/9 | 50 2/5 | 23 5/8
Weight: 160.94 lbs | 73 kg
Gross Weight: 180.78 lbs | 82 kg
Design & Mounting
Enclosure: Internally braced MDF
Finish: Structural paint black
Mounting: Floorstanding with feet
Grille: The THE21 SUB PRO ACTIVE VENTED is supplied with a front cover as standard
WHY: At ASCENDO, we believe that the pursuit of the highest-quality sound is more than just a technical goal—it’s a deeply emotional journey. The THE21 SUB PRO ACTIVE VENTED is designed for the discerning listener who knows what true audio excellence feels like. This subwoofer isn’t just about power; it’s about the visceral thrill of hearing every note, every low-frequency impact, with a clarity and depth that transports you to another world. For those who demand perfection, the THE21 SUB PRO is the final piece to elevate their audio experience to unprecedented levels.
HOW: From the first deep rumble to the finest low-end detail, THE21 SUB PRO reveals a new dimension of sound. Its vented design and carefully tuned 25 Hz frequency deliver bass that isn’t just heard—it’s felt deep in your chest, creating an experience that’s as much about sensation as it is about precision. Yet, even with its massive power, this subwoofer maintains a sense of control, producing incredibly tight and musical bass that can switch direction effortlessly.
The advanced double-gap motor system ensures a more linear motion and lightning-fast response, delivering deep, authoritative bass without sacrificing clarity or musicality. You won’t just hear the notes—you’ll feel them. And thanks to our commitment to transparency, you can trust that the published measurements from third-party labs match the performance you experience in your own space.
WHAT: THE21 SUB PRO is a sonic marvel—a subwoofer that pushes the boundaries of what’s possible with a 21-inch driver. With an integrated 3 kW amplifier and 6 kW power supply, this sub effortlessly handles even the most demanding musical and cinematic moments, delivering breathtaking output levels with ease.
Whether you’re immersed in the rumble of a movie’s lowest frequencies or lost in the musicality of your favorite tracks, every detail is revealed with stunning clarity. When paired with our infrasonic subwoofers, THE21 SUB PRO transforms your system into a powerhouse that delivers perfect bass all the way down below 20 Hz, with the same precision and musicality you would expect from ASCENDO.
To unlock its full potential, we recommend pairing the THE21 SUB PRO with our custom-designed amplifiers—because great bass deserves nothing less.
Specification
General
Speaker Type: 21” forward-firing, dual gap motor structure with 2 inner and 2 outer voice coiles, neodymium moto
XMAX: 17.5 mm excursion each direction (35 mm linear), voice coil remaining in homogeneous magnetic field, linear and lower distortion
Principle: Vented
Passive | Active: Active, built in DSP Amplifier
Measured Data
SPL Peak (Peak / Half Space 2pi): Measured Data 142 dB @ 62 Hz
Frequency Range: Measured Data (Without DSP) 30 Hz - 400 Hz / -3 dB 22 Hz - 500 Hz / -12 dB
Directivity Horizontal x Vertical in deg°: 360°
Power Specifications & Features
Output Power: 3000 W
Power Supply Requirements: 100-240 VAC, 50-60 Hz (Operating: 90-265 VAC)
Power Consumption
230 VAC - 1/8 rated power (4 Ohm)
3.2 A / 490 W
120 VAC - 1/8 rated power (4 Ohm)
6.2 A / 490 W
Idle: 0.5 A / 61 W
Automatic Power Off
Trigger
Connections
Input: 1 x XLR Balanced
Output: 1 x XLR Balanced Link
Power: Neutrik powerCON True 1 in-out
Communications: 2 x RJ45 / Daisy Chain
Signal Processing & Control
Protection Features: Turn-on transients, Over-heating, DC, RF, Short-circuit, mismatched loads, ICL™, PMS™
Controller: OCS Software Control
Converter: High Performance 96 kHz / 24 bits AD/DA converters, 64 bit double-precision 96 kHz DSP process
Input IIR EQ Section: Gain, Mute, Phase inversion, Delay (up to 116 ms, 40 m), 10 EQ filters (Parametric, Shelving, LP, HP, BP, SB, AP)
Dimensions & Weight
Dimensions (W/H/D) mm (Without Grille): 600 | 1124.5 | 500 (Height without feet: 1100) (Depth with plug: 530)
Dimensions (W/H/D) inch (Without Grille): 23 5/8 | 44 1/4 | 19 11/16 (Height without feet: 43 1/3) (Depth with plug: 20 7/8)
Packing Dimensions (W/H/D) mm: 680 | 1280 | 600
Packing Dimensions (W/H/D) inch: 26 7/9 | 50 2/5 | 23 5/8
Weight: 160.94 lbs | 73 kg
Gross Weight: 180.78 lbs | 82 kg
Design & Mounting
Enclosure: Internally braced MDF
Finish: Structural paint black
Mounting: Floorstanding with feet
Grille: The THE21 SUB PRO ACTIVE VENTED is supplied with a front cover as standard
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