The12 SUB PRO PASSIVE SEALED SH with its sealed cabinet concept offers a rock-solid bass sound from the smallest of dimensions, easily integrable in restricted installation situations. With its shallow depth of 210 mm (8.27”) and exceptional 12” woofer, it can deliver the kind of tight, punchy bass and impressive dynamics that many would like from their modest home theaters or media rooms, all while tucked away in out-of-the-way locations.

The12 SUB PRO PASSIVE SEALED SH shares the same core design advantages the entire range of ASCENDO subwoofers feature - extremely low distortion to reproduce the finest details with the highest dynamic range to meet the content transients without compression, but perhaps more importantly, a linear response from bottom to top to allow for exceptional integration with the main and surround channels.

Technical Data

Speaker type

12" forward-firing, advanced carbon nomex pulp mix cones, neodymium motor with 4” ultra-high-temperature voice-coil and triple shorting rings.


20 mm excursion each direction (40 mm linear), voice coil remaining in homogeneous magnetic field, linear and lowest distortion

Passive | Active


Recommended amplifiers 

1 Ch DSP + amplifier are required. Min. recommended amplifier: 70 Vrms, 99 Vpk, 17,5 A; equivalent to 1200W@ 4? with correct RMS & Peak limiting & compression settings.

Recommended ASCENDO amplifiers  

(With additional external 1CH DSP:  AIA2-1404 bridged, AIA2-2704, AIA4-2404 bridged, AIA4-6004, AIA8-6004 bridged) DSP4-6K2, DSP4-10K2




Calculated data
122 dB @ 100 Hz 

Frequency range

Calculated data
44 Hz - 400 Hz /   -3 dB
22 Hz - 400 Hz / -15 dB


88 dB  / 1W/m

Power handling 

1200 W


4 Ω  

Air volume displacement 

1,02 L / in comparison 12" standard cinema subwoofer 0,4 L

Directivity horizontal x vertical in Deg°


Input terminal

One 4-conductor Phoenix 12 AWG (3,3 mm²) 


Internally braced MDF


17,22 "| 450 mm


23,62" | 600 mm

Hight with feet 

24,24 "| 615 mm

Depth without grill 

8,27"  | 210 mm

Depth with plug

8,78"  | 223 mm


48,5 lbs | 22 kg


Matte black

Custom colour options 

Piano lacquer, colour of choice, matt or other finishes upon request

Shape customization 

Upon request 


Floor standing with feet


Technical modifications subject to change without further notice