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THE 28 SUB

SQUARED PRO PASSIVE

SEALED SHALLOW

Description

THE 28 SUB PRO SQUARED: Redefining Bass for the Ultimate Home Theater Experience

A Vision Born from Innovation

The inspiration for this revolutionary subwoofer came from a conversation at the ISE Show with Trinnov CEO Arnaud Laborie, where we explored new ways to enhance bass performance. The result? A subwoofer design like nothing the world has seen before. After extensive research and experimentation, we developed a 28” composite sandwich cone, built from multiple layers of rohacell. With the cone area equivalent to a 32” round subwoofer, this masterpiece is engineered to push the boundaries of what's possible in low-frequency sound reproduction.

Unmatched Performance in Any Space

Whether you're creating a subwoofer cluster for a shallow, wide, and high wall of bass or integrating it into Trinnov WaveForming, Dirac ART, double bass arrays, or single bass arrays, this subwoofer stands as the ideal solution. It delivers the highest output while occupying minimal space, making it perfect for even the most space-conscious home theater setups.

Imagine a subwoofer that can effortlessly reproduce single-digit infrasonic frequencies, delivering earth-shaking bass that you can feel in your bones. At the same time, it can soar well above the LFE cutoff frequency of 120Hz, serving as the ultimate kick woofer. Whether it’s the rumble of a distant explosion or the sharp crack of a gunshot, this subwoofer brings every sound to life with stunning clarity and power.

Designed for Perfect Integration

We designed this subwoofer to be versatile and easy to integrate into any home theater system. Its unique construction allows for woofers to be spaced very closely together, achieving perfect coupling for bass array systems with control up to 120Hz. And with an overall depth of just 30 cm / 11,81 inch, it’s a perfect fit even in challenging installations. Despite its compact design, the subwoofer boasts outside dimensions of 80 cm / 37,80 inch wide and 100 cm / 39,37 inch high, making it a powerhouse of sound in a surprisingly sleek package.

Feel Every Beat, Every Moment

The engineering behind this subwoofer is nothing short of extraordinary. We’ve harnessed an immense amount of power in the motor structure, giving it the muscle needed to accelerate the cone, motor mass, and coupled air mass with lightning speed. This results in a subwoofer that produces a perfect planar wave front, with high efficiency, ultra-high-power handling, and very low system Q. The shallow roll-off, combined with ultra-dynamic response, means that every sound—from the subtlest whisper to the most intense action scene—hits with native speed, attack, and impact that other woofers simply can't match.

Why Settle for Ordinary? Experience the Extraordinary.

This isn't just about sound—it's about emotion. It's about feeling every moment of your favorite movie, every note of your favorite song, in a way that's so real, it's almost tangible. This Ascendo subwoofer is a gateway to a deeper, more immersive audio experience. Don’t just watch your movies; live them.

Specification

General

Speaker Type

28” forward-firing, advanced carbon rohacell composite sandwich flat panel cone, neodymium motors with quad 4” ultra-high-temperature voice-coil


XMAX

22 mm excursion each direction (44 mm linear), voice coil remaining in homogeneous magnetic field


Principle

Sealed


Passive | Active

Passive


Recommended Amplifiers

1Ch Amplifier is required. Min. recommended amplifier: 141 Vrms, 200 Vpk, 17.7 A; equivalent to 2500 W @ 8 Ω, up to 450 V Peak. Other configuration can be 2 x 4 Ohms with 2 x 250 V Peak (2 x 178 V RMS)


Recommended ASCENDO Amplifiers

(With DSP-4D: AIA2-10K2 IS), DSP4-20K2


Measured Data

SPL Peak (Peak / Half Space 2pi)

Measured Data 140 dB @ 80 Hz and up 123 dB @ 20 Hz 100 dB @ 11 Hz


Frequency Range

Measured data (without DSP) 55 Hz - 500 Hz / -3 dB 38 Hz - 640 Hz / -10 dB


Power Handling

30k W Peak


Efficiency

92 dB / 1 W/m 4 pi, 98 dB / 1 W/m 2 pi


Impedance

2 x 4 Ω (Other configurations possible)


Directivity Horizontal x Vertical in deg°

360°


Max Linear Air Volume Displacement

6.16 US. liq. gal. | 23.32 L


Input

Input Terminal

4-conductor Wago Lever-Nuts® 10 AWG (6.00 mm²)


Dimensions & Weight

Dimensions (W/H/D) mm (Without Grille)

800 | 1015 | 300 (Height without feet: 1000)


Dimensions (W/H/D) inch (Without Grille)

31 1/2 | 39 15/16 | 11 13/16 (Height without feet: 39 3/8)


Packing Dimensions (W/H/D) mm

960 | 1160 | 460


Packing Dimensions (W/H/D) inch

37 13/16 | 45 11/16 | 18 1/8


Weight

268.96 lbs | 122 kg


Gross Weight

291.01 lbs | 132 kg


Design & Mounting

Enclosure

Internally braced MDF


Finish

Satin matte black


Mounting

Floorstanding with feet


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