WHY: At ASCENDO, we hold the conviction that achieving superior sound quality transcends mere technical achievement—it's an emotional voyage. The THE21 SUB PRO PASSIVE VENTED is crafted for the discerning audiophile who appreciates the essence of true audio brilliance. This subwoofer goes beyond sheer power; it delivers the exhilarating experience of perceiving each note and every low-frequency impact with unparalleled clarity and depth, transporting you to a different realm. For those who seek nothing less than perfection, the THE21 SUB PRO will elevate your audio experience to extraordinary heights.
HOW: From the initial deep rumble to the most intricate low-end nuances, THE21 SUB PRO unveils a new realm of audio. Its vented design, paired with a meticulously tuned 25 Hz frequency, produces bass that resonates not just audibly but physically, offering an experience that blends sensation with precision. Despite its immense power, this subwoofer retains exceptional control, delivering tight, musical bass that can switch direction seamlessly.
The sophisticated double-gap motor system promotes a more linear motion and rapid response, providing deep, commanding bass without compromising clarity or musicality. You won't just hear the notes—you'll feel them in your body. Our dedication to transparency ensures that the performance you encounter in your own environment aligns with the published measurements from independent labs.
WHAT: THE21 SUB PRO is an acoustic masterpiece, redefining the limits of a 21-inch driver. Whether you're enveloped in the deep rumble of a film's lowest frequencies or captivated by the musicality of your favorite songs, every nuance is unveiled with remarkable clarity. This passive version of THE21 can handle up to 5kW of power, offers enhanced flexibility and potential to craft the ultimate bass experience. When combined with our infrasonic subwoofers, THE21 SUB PRO elevates your system into a formidable force, delivering flawless bass that extends below 20 Hz, maintaining the precision and musicality synonymous with ASCENDO.
To fully realize its capabilities, we suggest pairing THE21 SUB PRO with our specially designed amplifiers—because exceptional bass deserves nothing less.
General
Speaker Type: 21” forward-firing, dual gap motor structure with 2 inner and 2 outer voice coils, neodymium motor
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: Passive
Recommended Amplifiers: 1Ch DSP and 1Ch amplifier are required. Min. recommended amplifier: 72 Vrms, 102 Vpk, 18.0 A; equivalent to 3000 W @ 4 Ω, with correct RMS & peak limiter settings
Recommended ASCENDO Amplifiers: DSP4-6602, DSP4-10K2, or DSP-4D + AIA2-10K2 IS
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
Power Handling: 4000 W
Efficiency: 100 dB / 1 W/m 2 pi
Impedance: 4 Ω
Directivity Horizontal x Vertical in deg°: 360°
Input
Input Terminal: Neutrik Speakon
Dimensions & Weight
Dimensions (W/H/D) mm (Without Grille): 600 | 1250 | 500 (Height without feet: 1100)
Dimensions (W/H/D) inch (Without Grille): 23 10/16 | 49 3/16 | 19 (Height without feet: 43 5/16)
Packing Dimensions (W/H/D) mm: 680 | 1280 | 600
Packing Dimensions (W/H/D) inch: 26 3/18 | 50 3/8 | 23 10/16
Weight: 147.71 lbs | 67 kg
Gross Weight: 165.35 lbs | 75 kg
Design & Mounting
Enclosure: Internally braced MDF
Finish: Structural paint black
Mounting: Floorstanding with feet
Name: The THE21 SUB PRO PASSIVE VENTED is supplied with a front cover as standard
WHY: At ASCENDO, we hold the conviction that achieving superior sound quality transcends mere technical achievement—it's an emotional voyage. The THE21 SUB PRO PASSIVE VENTED is crafted for the discerning audiophile who appreciates the essence of true audio brilliance. This subwoofer goes beyond sheer power; it delivers the exhilarating experience of perceiving each note and every low-frequency impact with unparalleled clarity and depth, transporting you to a different realm. For those who seek nothing less than perfection, the THE21 SUB PRO will elevate your audio experience to extraordinary heights.
HOW: From the initial deep rumble to the most intricate low-end nuances, THE21 SUB PRO unveils a new realm of audio. Its vented design, paired with a meticulously tuned 25 Hz frequency, produces bass that resonates not just audibly but physically, offering an experience that blends sensation with precision. Despite its immense power, this subwoofer retains exceptional control, delivering tight, musical bass that can switch direction seamlessly.
The sophisticated double-gap motor system promotes a more linear motion and rapid response, providing deep, commanding bass without compromising clarity or musicality. You won't just hear the notes—you'll feel them in your body. Our dedication to transparency ensures that the performance you encounter in your own environment aligns with the published measurements from independent labs.
WHAT: THE21 SUB PRO is an acoustic masterpiece, redefining the limits of a 21-inch driver. Whether you're enveloped in the deep rumble of a film's lowest frequencies or captivated by the musicality of your favorite songs, every nuance is unveiled with remarkable clarity. This passive version of THE21 can handle up to 5kW of power, offers enhanced flexibility and potential to craft the ultimate bass experience. When combined with our infrasonic subwoofers, THE21 SUB PRO elevates your system into a formidable force, delivering flawless bass that extends below 20 Hz, maintaining the precision and musicality synonymous with ASCENDO.
To fully realize its capabilities, we suggest pairing THE21 SUB PRO with our specially designed amplifiers—because exceptional bass deserves nothing less.
General
Speaker Type: 21” forward-firing, dual gap motor structure with 2 inner and 2 outer voice coils, neodymium motor
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: Passive
Recommended Amplifiers: 1Ch DSP and 1Ch amplifier are required. Min. recommended amplifier: 72 Vrms, 102 Vpk, 18.0 A; equivalent to 3000 W @ 4 Ω, with correct RMS & peak limiter settings
Recommended ASCENDO Amplifiers: DSP4-6602, DSP4-10K2, or DSP-4D + AIA2-10K2 IS
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
Power Handling: 4000 W
Efficiency: 100 dB / 1 W/m 2 pi
Impedance: 4 Ω
Directivity Horizontal x Vertical in deg°: 360°
Input
Input Terminal: Neutrik Speakon
Dimensions & Weight
Dimensions (W/H/D) mm (Without Grille): 600 | 1250 | 500 (Height without feet: 1100)
Dimensions (W/H/D) inch (Without Grille): 23 10/16 | 49 3/16 | 19 (Height without feet: 43 5/16)
Packing Dimensions (W/H/D) mm: 680 | 1280 | 600
Packing Dimensions (W/H/D) inch: 26 3/18 | 50 3/8 | 23 10/16
Weight: 147.71 lbs | 67 kg
Gross Weight: 165.35 lbs | 75 kg
Design & Mounting
Enclosure: Internally braced MDF
Finish: Structural paint black
Mounting: Floorstanding with feet
Name: The THE21 SUB PRO PASSIVE VENTED is supplied with a front cover as standard
