Helix K 12W – SVC2 – 1 x 2 Ohms

Helix K 12W – 300 mm / 12″ subwoofer for compact vented enclosures

Version: SVC2 – 1 x 2 Ohms

The Helix K 12W is a 12-inch subwoofer chassis from the HELIX K series, whose drivers are designed to deliver powerful bass from very compact enclosures. It suits custom installations where only limited or awkwardly shaped space is available in the vehicle, without acoustic compromises according to the manufacturer.

The cone is made from hand-formed (hand-scooped) paper fibres and is extremely stiff. Together with a heavy-duty driver and a double-ventilated voice coil, it converts amplifier power into high sound pressure with minimal compression, and the manufacturer credits it with a subtle, pleasant tonal character. The K series is offered with single (SVC2, 1 x 2 Ohms) or dual (DVC2, 2 x 2 Ohms) voice coils; this item is the SVC2 version with a single 2-Ohm voice coil.

Key Features

• Compact-enclosure design: Strong magnet system tuned for compact vented enclosures – makes efficient use of limited space in the vehicle.
• Single 2-Ohm voice coil: 1 x 2 Ohms single voice coil (SVC2), suitable for mono, two-channel or multichannel amplifiers.
• Hand-scooped paper cone: Extremely stiff cone of hand-formed paper fibres for fast, precise transient response.
• Double-ventilated voice coil: Minimises compression effects and supports high power handling.
• Long-excursion rubber surround: High mechanical load capacity; Xmax ±8.0 mm.
• Very long linear excursion: Large linear stroke for high output from a small enclosure.
• Power handling: 300 W RMS / 600 W max.
• Terminals: Solid push terminals.
• Protective magnet cover: Rugged cover with HELIX lettering protects the magnet.
• Grille and gasket included: Ready for custom enclosure builds; the data sheet gives enclosure recommendations including DSP settings.

Drivers & Construction

• Nominal size 300 mm / 12″; outer diameter 316 mm / 12.44″.
• Cone material: hand-scooped paper; effective cone area (Sd) 515 cm².
• Voice coil: 50.8 mm diameter, 24 mm winding height, double-ventilated.
• Long-excursion rubber surround and rugged magnet cover with HELIX lettering.
• Solid push terminals.

Acoustic Performance

The values below are those published for the SVC2 (1 x 2 Ohms) version.

• Power handling: 300 W RMS / 600 W max.
• Impedance: 1 x 2 Ohms (DC resistance 2.0 Ohms).
• Sensitivity: 89.0 dB @ 1 W / 1 m.
• Resonance frequency (Fs): 31 Hz.
• Q factors: Qms 4.03, Qes 0.54, Qts 0.47.
• Equivalent air volume (Vas): 53 l; compliance (Cms) 142 µm/N.
• Force factor: 11.9 Tm; moving mass (Mms) 146 g; mechanical resistance (Rms) 9.20 kg/s.
• Maximum linear excursion (Xmax): ±8.0 mm.

Installation Notes

• Installation (cut-out) diameter: 286 mm; installation depth: 144 mm / 5.67″.
• Recommended sealed enclosure: 22 l net volume, -3 dB at 40 Hz; suggested DSP high-pass 37 Hz (Q 1.5) plus EQ 80 Hz, Q 1.3, -3 dB.
• Recommended vented enclosure: 40 l net volume, port Ø 100 mm (78 cm²), 35 cm long, tuned to 34 Hz, -3 dB at 37 Hz; suggested DSP high-pass 34 Hz (Q 0.8) plus EQ 80 Hz, Q 0.7, -2 dB.

Technical Specifications

Scope of Delivery

1 x Subwoofer HELIX K 12W [SVC2]
1x Grille
1 x Gasket
1 x Data sheet