Elipson Premium Sub 15 black

The Premium Sub 15 Black is an active subwoofer from Elipson’s range. It features a 650-watt Class D amplifier and a 380 mm driver. This model is designed for setups requiring extended reproduction of low and infrasonic frequencies.

Acoustic design mastered by the front laminar bass-reflex

The technical hallmark of the Premium Sub 15 lies in its bass-reflex architecture with a front laminar port. This elongated rectangular configuration, rather than a simple circular port, regulates the airflow generated by the cone’s movement. The carefully contoured internal deflector extends the acoustic path inside the cabinet while maintaining a smooth, linear air velocity. This approach significantly reduces turbulence and acoustic compression—the culprits behind unwanted noise and distortion often audible on conventional high-output subwoofers.

The laminar port offers an enlarged flow surface that lowers air speed, thereby eliminating the whistling typical of undersized ports during dynamic passages. This technology, more costly to implement than a simple cylindrical tube, reflects Elipson’s commitment to sound quality. The system operates as a precisely tuned Helmholtz resonator: at the selected resonance frequency, the air within the port vibrates in phase with the diaphragm, allowing the subwoofer to reach down to 19 Hz (±3 dB) while maintaining a linear response.

A fiberglass driver combining rigidity and lightness

The choice of a 380 mm fiberglass diaphragm is a deliberate technical compromise. This composite material offers a particularly favorable stiffness-to-weight ratio for a driver of this size. Fiberglass provides rigidity comparable to aluminum while keeping mass low, enabling the rapid accelerations and decelerations of the cone that are essential for accurate transient reproduction in the low-frequency range.

Unlike paper or polypropylene cones, which are more compliant but prone to deformation at high power, or metal cones, which are rigid but likely to generate parasitic resonances, fiberglass maintains piston-like behavior even during substantial excursions. This structural stability translates into minimal distortion and the ability to handle the 650 watts of the built-in amplifier without audible compression or signal deformation.

Fiberglass’s inherent thermal resistance is also an advantage for a subwoofer intended to operate at full power over long sessions. The material retains its mechanical properties even when the voice coil generates significant heat, ensuring consistent performance regardless of usage duration.

Class D amplification tuned for large spaces

The 650-watt Class D amplifier built into the Premium Sub 15 is sized to fully exploit the capabilities of the 380 mm driver. Class D technology, favored for its energy efficiency exceeding 90%, generates less heat than traditional Class AB amplification, enabling a compact integration without active cooling.

The onboard DSP offers a configurable +3 dB boost centered at 26 Hz, a strategic frequency corresponding to the deepest fundamentals of acoustic instruments and cinematic special effects. This targeted lift compensates for the human ear’s natural sensitivity roll-off in the extreme low end, without masking higher frequencies. The 21 Hz subsonic filter with a 12 dB-per-octave slope protects the driver from potentially destructive infrasonic signals while preserving the full audible spectrum.

The crossover frequency range, adjustable from 30 to 200 Hz, allows flexible integration with various main speakers. The 0°/180° phase switch facilitates time alignment with satellites—especially crucial in setups where the subwoofer cannot be ideally positioned. Auto-standby switches the amplifier off after a period of inactivity, reducing idle consumption to just a few watts.

Substantial dimensions in service of acoustic performance

With dimensions of 465 × 552 × 534 millimeters (including grille and feet) and a weight of 41 kilograms, the Premium Sub 15 makes a physical statement in the listening space. This substantial volume is not gratuitous: it stems directly from the acoustic principles linking the internal cabinet volume to the resonance frequency of a bass-reflex system. To achieve 19 Hz with satisfactory efficiency, the trapped air volume must be sufficient to provide the necessary acoustic compliance.

The cabinet, likely constructed from high-density MDF panels, minimizes unwanted vibrations thanks to its considerable mass. The matte black finish blends discreetly into most home environments while effectively concealing fingerprints and dust. The removable protective grille, designed to be acoustically transparent, shields the diaphragm without altering the frequency response.

Connectivity designed for system integration

The Premium Sub 15’s connectivity is conventional yet comprehensive. Stereo low-level line inputs (L/R) accept signals from preamplifiers or home theater processors, while the dedicated LFE input simplifies connection to amplifiers with a subwoofer output. Line outputs allow daisy-chaining multiple subwoofers or sending the signal to powered speakers, offering appreciable installation flexibility.

The absence of high-level connections (via speaker binding posts) could limit integration with some stereo amplifiers lacking a pre-out, but this configuration is uncommon in modern electronics. The rear-mounted controls, standard for this product category, will require a few adjustments during initial setup to dial in the optimal settings for each installation.

Technical specifications

Amplification and driver

• Output power: 650 W Class D
• Driver: 380 mm fiberglass cone

Acoustic response

• Frequency response (±3 dB): 19 Hz – 200 Hz
• DSP EQ: +3 dB @ 26 Hz
• Subsonic filter: 21 Hz / 12 dB per octave
• Variable crossover frequency: 30 Hz – 200 Hz
• Phase: 0° / 180°

Connectivity

• Inputs: Line L / R (low-level), LFE
• Output: Line L / R (low-level)
• Standby mode: automatic

Dimensions and weight

• Without grille and feet: W465 x H530 x D522 mm, 41 kg
• With grille and feet: W465 x H552 x D534 mm, 41 kg
• Packaging: W659 x H671 x D602 mm, 49.5 kg

General information

• Type: active subwoofer
• Architecture: front laminar bass reflex
• Use: hi-fi / home theater
• Design: elegant, robust, easy to integrate into large spaces