The21 SUB PRO PASSIVE SEALED is a jewel in the pool of subwoofers designed for the highly educated customer that is on the quest for the highest performance and understands how to differentiate sound quality.
When this customer experiences the The21 SUB PRO PS unparalleled output and uncolored sound, the measured test results we publish translate perfectly to realized performance. ASCENDO’s policy is to be completely transparent and publish measurements done by independently certified third-party labs to provide factual data, thereby enabling informed, educated decisions. The The21 SUB PRO subwoofer is so far above and beyond the competition in every aspect; refined musicality, tightness, and output levels suitable for a 21" driver. It is also engineered to operate perfectly in sync (in phase) with our Infrasonic subwoofers; The24 PRO, The32 PRO, The50 PRO, The80 PRO when there is a desire to reproduce movie content below 20Hz with the same authority, precision, and musicality.
Compared to conventional subwoofer motor concepts, the ultra-modern double-gap motor of this custom-made 21" driver with two outer and two inner voice-coils enables more linear travel and much faster directional changes with higher sound power and significantly lower power compression.
Specification
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: Sealed
Passive | Active: Passive
Recommended Amplifiers: 1Ch DSP and 1CH amplifier are required. Min. recommended amplifier: 109 Vrms, 154 Vpk, 27.3 A; equivalent to 3000 W @ 4 Ω with correct RMS & peak limiter settings
Recommended ASCENDO Amplifiers: (With DSP-4D: AIA2-10K2 IS, AIA2-6004), DSP4-10K2, DSP4-20K2
Measured Data
SPL Peak (Peak / Half Space 2pi): Measured Data 139 dB @ 63 Hz
Frequency Range: Measured Data (Without DSP) 55 Hz - 500 Hz / -3 dB 28 Hz - 500 Hz / -12 dB
Power Handling: 4000 W
Efficiency: 97 dB / 1 W/m 2 pi
Impedance: 4 Ω
Directivity Horizontal x Vertical in deg°: 360°
Max Linear Air Volume Displacement: 1.54 US. liq. gal. | 5.82 L
Input
Input Terminal: Neutrik Speakon
Dimensions & Weight
Dimensions (W/H/D) mm (Without Grille): 600 | 1125 | 370 (Height without feet: 1100)
Dimensions (W/H/D) inch (Without Grille): 23 10/16 | 44 5/16 | 14 9/16 (Height without feet: 43 5/16)
Packing Dimensions (W/H/D) mm: 700 | 1250 | 500
Packing Dimensions (W/H/D) inch: 27 9/16 | 49 3/16 | 19 11/16
Weight: 112.44 lbs | 51 kg
Gross Weight: 132.28 lbs | 60 kg
Design & Mounting
Enclosure: Internally braced MDF
Finish: Structural paint black
Mounting: Floorstanding with feet
Name: The THE21 SUB PRO PASSIVE SEALED is supplied with a front cover as standard
The21 SUB PRO PASSIVE SEALED is a jewel in the pool of subwoofers designed for the highly educated customer that is on the quest for the highest performance and understands how to differentiate sound quality.
When this customer experiences the The21 SUB PRO PS unparalleled output and uncolored sound, the measured test results we publish translate perfectly to realized performance. ASCENDO’s policy is to be completely transparent and publish measurements done by independently certified third-party labs to provide factual data, thereby enabling informed, educated decisions. The The21 SUB PRO subwoofer is so far above and beyond the competition in every aspect; refined musicality, tightness, and output levels suitable for a 21" driver. It is also engineered to operate perfectly in sync (in phase) with our Infrasonic subwoofers; The24 PRO, The32 PRO, The50 PRO, The80 PRO when there is a desire to reproduce movie content below 20Hz with the same authority, precision, and musicality.
Compared to conventional subwoofer motor concepts, the ultra-modern double-gap motor of this custom-made 21" driver with two outer and two inner voice-coils enables more linear travel and much faster directional changes with higher sound power and significantly lower power compression.
Specification
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: Sealed
Passive | Active: Passive
Recommended Amplifiers: 1Ch DSP and 1CH amplifier are required. Min. recommended amplifier: 109 Vrms, 154 Vpk, 27.3 A; equivalent to 3000 W @ 4 Ω with correct RMS & peak limiter settings
Recommended ASCENDO Amplifiers: (With DSP-4D: AIA2-10K2 IS, AIA2-6004), DSP4-10K2, DSP4-20K2
Measured Data
SPL Peak (Peak / Half Space 2pi): Measured Data 139 dB @ 63 Hz
Frequency Range: Measured Data (Without DSP) 55 Hz - 500 Hz / -3 dB 28 Hz - 500 Hz / -12 dB
Power Handling: 4000 W
Efficiency: 97 dB / 1 W/m 2 pi
Impedance: 4 Ω
Directivity Horizontal x Vertical in deg°: 360°
Max Linear Air Volume Displacement: 1.54 US. liq. gal. | 5.82 L
Input
Input Terminal: Neutrik Speakon
Dimensions & Weight
Dimensions (W/H/D) mm (Without Grille): 600 | 1125 | 370 (Height without feet: 1100)
Dimensions (W/H/D) inch (Without Grille): 23 10/16 | 44 5/16 | 14 9/16 (Height without feet: 43 5/16)
Packing Dimensions (W/H/D) mm: 700 | 1250 | 500
Packing Dimensions (W/H/D) inch: 27 9/16 | 49 3/16 | 19 11/16
Weight: 112.44 lbs | 51 kg
Gross Weight: 132.28 lbs | 60 kg
Design & Mounting
Enclosure: Internally braced MDF
Finish: Structural paint black
Mounting: Floorstanding with feet
Name: The THE21 SUB PRO PASSIVE SEALED is supplied with a front cover as standard
Image 1 of 5
Image 2 of 5
Image 3 of 5
Image 4 of 5
Image 5 of 5