Ascendo THE19-2 Sub Pro Passive Sealed Shallow

Dual Drivers. Greater Headroom. Shallow Depth.

THE19-2 SUB PRO PASSIVE SEALED SHALLOW is engineered for home cinemas and listening spaces that demand substantially greater output and dynamic headroom without sacrificing installation flexibility.
By combining two 19-inch drivers in a single enclosure only 265 mm/10.43 inches deep, THE19-2 delivers exceptional low-frequency capability while retaining the shallow form factor required for space-critical installations.

Each driver features an advanced carbonfiber/Rohacell® composite sandwich cone, powered by a high-strength neodymium motor with a 4-inch ultra-high-temperature voice coil. Independent half-space measurements record 138.5 dB peak SPL at 63 Hz and 138.3 dB at 100 Hz in accordance with CEA-2010-B.

At any given system output, the two drivers share the required displacement. This reduces the excursion demanded from each individual driver, increasing available headroom and helping to reduce distortion and dynamic compression during demanding musical and cinematic passages.

The result is exceptional low-frequency impact, control, and dynamic ease from a shallow cabinet, ideal for installations in which conventional deep subwoofer enclosures cannot be accommodated.

Short-Term Peak and Sustained Output Performance

In addition to short-burst CEA-2010-B measurements, THE19-2 is subjected to the same demanding CEA-2034-A stepped compression test.

Each test level is maintained for two minutes. The level is initially increased in 3 dB steps and then in 1 dB steps as the system approaches its maximum usable output.

This sustained procedure causes the voice coils and motor assemblies to reach significantly elevated temperatures. The resulting increase in voice-coil resistance reduces electrical power transfer and reveals the thermal power compression that occurs during prolonged high-output operation.

The test is terminated at 2 dB mean compression. Under these conditions, THE19-2 achieves a maximum usable continuous SPL of 122.0 dB and a corresponding peak SPL of 130.8 dB at 1 meter in half-space.

This sustained result is intentionally lower than the CEA-2010-B short-burst figure. It represents the output the system can maintain under substantial thermal loading rather than the higher level achievable during a brief tone burst.

Phase-Coherent Integration with Infrasonic Subwoofers

Like its sibling, THE19 SUB PRO PASSIVE SEALED SHALLOW*, THE19-2 can be combined with ASCENDO’s infrasonic subwoofers, including THE24, THE28, THE32, THE64, and THE100.

When correctly filtered, time-aligned, equalized, polarity-checked, and level-matched, the systems integrate phase coherently across their respective operating ranges. This produces a seamless transition from infrasonic to low frequencies while preserving the precision, impact, and musical coherence of the complete system.

*For installations in which the output capability of a single 19-inch driver is sufficient, THE19 provides the same shallow-depth concept and advanced driver technology in a more compact single-driver configuration.

Specification

General

Speaker Type: 2 × 19-inch forward-firing drivers with advanced carbon-fiber/Rohacell® composite sandwich cones, neodymium motors, and 4-inch ultra-high-temperature voice coils

XMAX: 22 mm one-way linear excursion per driver; 44 mm peak-to-peak, with each voice coil remaining within the homogeneous magnetic field for linear, low-distortion operation

Principle: Sealed

Passive | Active: Passive

Recommended Amplification

DSP and Amplifier Channels: Two independent amplifier channels are required, with one amplifier channel driving each 4 Ω woofer separately. One shared DSP processing path may feed both channels when identical processing is required; two independent DSP channels may be used for individual control, monitoring, or limiting.

Minimum Recommended Amplifier Capability: Per amplifier channel: 89 Vrms 126 Vpk 22.5 Arms Equivalent to approximately 2,000 W into 4 Ω Complete system: two channels, approximately 2,000 W into 4 Ω each.

Recommended ASCENDO Electronics: DSP4-6602, DSP4-10K2, or DSP-4D + AIA2-10K2 IS

Configuration Notes: The two drivers should not normally be connected in parallel as a 2 Ω load. Independent drive preserves greater effective electrical damping, reduces the influence of cable resistance, avoids the higher current demand of a 2 Ω load, and allows correct individual RMS and peak limiting. Correct RMS and peak limiter settings must be applied to each amplifier channel.

Measured Output

Peak SPL at 1 m, Half-Space / 2π: 138.5 dB at 63 Hz, CEA-2010-B

Maximum Usable Output at 1 m, Half-Space / 2π: 122.0 dB continuous / 130.8 dB peak, CEA-2034-A compression test

CEA-2034-A Test Procedure: Successive two-minute test levels Initially increased in 3 dB steps Reduced to 1 dB steps near maximum output Measurement range: 20–160 Hz Stop criterion: 2 dB mean compression DSP processing applied

Frequency Range

Measured without DSP: 33 Hz–400 Hz / −3 dB 23 Hz–500 Hz / −12 dB

Measured with DSP: 20 Hz–140 Hz / −3 dB 15 Hz–200 Hz / −12 dB

Additional Data

Power Handling: 5,000 W

Sensitivity: 99 dB SPL / 1 W / 1 m, half-space / 2π

Nominal Impedance: 4 Ω per woofer

Directivity: Nominally omnidirectional within the intended operating range

Maximum Linear Air-Volume Displacement: 10.74 L / 2.84 US liquid gallons

Input

Input Terminal: 4-conductor Phoenix connector, suitable for 12 AWG / 3.3 mm² cable The four-conductor connection allows the two 4 Ω woofers to be driven separately.

Dimensions & Weight

Dimensions (W × H × D) mm — without grille: 600 × 1215 × 265 mm Height without feet: 1200 mm

Dimensions (W × H × D) inch — without grille: 23 10/16 × 47 13/16 × 10 7/16 inches Height without feet: 47 4/16 inches

Packing Dimensions (W × H × D) mm: 750 × 1330 × 440 mm

Packing Dimensions (W × H × D) inch: 29 1/2 × 52 3/8 × 17 5/16 inches

Net Weight: 67 kg | 147.71 lb

Gross Weight: 75 kg | 165.35 lb

Design & Mounting

Enclosure: Internally braced MDF

Finish: Satin matte black

Mounting: Floorstanding with feet