Helix IQ W12-DVC2

Helix IQ W12-DVC2 – 12″ audiophile subwoofer with Tuneable Mass System

The IQ W12-DVC2 is the 12-inch model of the HELIX IQ subwoofer range, aimed at listeners who want both high output and high sound quality. It is optimised for high-power amplifiers (recommended 300 to 750 W RMS) and works in compact sealed enclosures as well as in high-output bass reflex systems.

Its key technology is the proprietary Tuneable Mass System (TMS): weights added to or removed from the dustcap change the moving mass. Without extra mass the resonance is higher for efficiency and fast, punchy bass; with added mass the resonance drops for deeper bass in sealed or low-tuned reflex boxes. A 3-layer fiberglass-Mylar honeycomb cone, a large vented pole piece with an airflow-optimised basket, and a die-cast aluminium basket with integrated grille complete the design.

Key Features

• Audiophile grade: deep low-frequency extension and accurate dynamics.
• High power: 750 W RMS / 1,500 W max power handling.
• Tuneable Mass System: three supplied tuning masses adjust the T/S parameters before or after installation.
• Honeycomb cone: 3-layer fiberglass-Mylar construction for rigidity and internal damping.
• Dual 2 Ω voice coil: wireable to 1 Ω or 4 Ω for monoblocks and multi-sub systems.
• Cooling: large vented pole piece and airflow-optimised basket reduce thermal compression.
• Compact enclosures: designed for space-saving installations.
• Sealed or bass reflex: recommended box designs for both.
• Die-cast aluminium basket: rigid and resonance-resistant, with integrated protective grille.
• Long excursion: ±12 mm linear excursion.

Drivers & Construction

300 mm driver with fiberglass-Mylar honeycomb cone (515 cm² cone area), 63 mm dual voice coil with 34 mm winding height, vented pole piece and die-cast aluminium basket with integrated grille.

Acoustic Performance

Power handling 750 W RMS / 1,500 W max, recommended amplifier power from 300 W RMS, impedance 2 x 2 Ω (Re 2 x 1.9 Ω), sensitivity 90 dB at 2.83 V/1 m (87 dB at 1 W/1 m). Fixed T/S data: Qms 5.37, Cms 96 µm/N, Vas 35 l, BL 18.1 Tm, Rms 8.5 kg/s, Xmax ±12 mm. Depending on tuning mass (none / +1 / +2 / +3 TM): Fs 36 / 32 / 29 / 27 Hz, Mms 199 / 252 / 305 / 358 g, Qes 0.53 / 0.59 / 0.64 / 0.69, Qts 0.48 / 0.53 / 0.57 / 0.62.

Installation Notes

Outer diameter 327.1 mm (12.88″), installation diameter 281 mm (11.06″), installation depth 144.7 mm (5.70″). Recommended sealed enclosures range from 33 to 115 l net (lower -3 dB limit from 53 Hz down to 31 Hz). Recommended bass reflex enclosures range from 70 to 140 l net with a 100 mm port (78 cm²), port lengths 27–39 cm and tuning from 31 Hz down to 19 Hz (-3 dB from 27 Hz down to 16 Hz).

Technical Specifications

Scope of Delivery

1 x Subwoofer IQ W12-DVC2
1 x Installation gasket
2 x Mounting material
1 x Grille
2 x Grille removal tool
3 x Tuning mass (TM)
1 x Data sheet