Continuous power handling
Voice coil diameter
Diaphragm material
Throat diameter
The Helical Approach

B&C has a reputation for performance, by turning the limits of traditional compression driver design on their head. HLX™ : Compression driver efficiency in miniature. The HLX™ phase plug (US and EP Patents Pending) has a central channel that is twisted, like DNA, to gain the length required to match the outer channels. This technique works with standard, cost-effective injection mold tooling and plastics by rotating the inner die along a screw profile. The convex dome design, so achieved, has a number of significant cost and performance advantages.

Minimized diameter, weight, and cost
lncreased diaphragm area
 Low, ~1kHz Crossover point
 Reduced distortion, especially intermodulation distortion
 More efficient magnetic flux use



  • Ultra Compact 48mm diameter
  • 40 W continuous program power capacity
  • 1" horn throat diameter
  • 36 mm (1.4 in) aluminium voice coil
  • HT Polymer diaphragm
  • 1000 - 17000 Hz response
  • 109.5 dB sensitivity


  • Throat Diameter25 mm (1.0 in)
  • Nominal Impedance16 Ω
  • Minimum Impedance10.4 Ω
  • Nominal Power Handling220 W
  • Continuous power handling340 W
  • Sensitivity (1W/1m)4109.5 dB
  • Frequency Range1.0 - 17.0 kHz
  • Recommended Crossover51.0 kHz
  • Voice Coil Diameter36 mm (1.4 in)
  • Winding MaterialAluminium
  • Inductance0.15 mH
  • Diaphragm MaterialHT Polymer
  • Flux Density1.8 T
  • Magnet MaterialNeodymium Inside Slug

Mounting and Shipping Info

  • Two M5 holes 180° on 53 mm (2.09 in) diameter
  • Overall Diameter48 mm (1.89 in)
  • Depth46 mm (1.81 in)
  • Net Weight0.25 kg (0.56 lb)
  • Other DetailsOne M5 threaded hole on the back of the magnet structure is available for the installation of an optional heat sink.
  • Driver mounted on B&C ME 45 horn.
  • 2 hour test made with continuous pink noise signal within the range from the recommended crossover frequency to 20 kHz. Power calculated on rated minimum impedance.
  • Power on Continuous Program is defined as 3 dB greater than the Nominal rating.
  • Applied RMS Voltage is set to 4 V for 16 ohms Nominal Impedance.
  • 12 dB/oct. or higher slope high-pass filter.