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



  • Very Compact 69 mm diameter
  • 80 W* continuous program power capacity
  • 1" horn throat diameter
  • 44 mm (1.7 in) aluminium voice coil
  • HT Polymer diaphragm
  • 1000 - 18000 Hz response
  • 109 dB sensitivity
  • * Small heat sink required for full power application


  • Throat Diameter25 mm (1.0 in)
  • Nominal Impedance8 Ω
  • Minimum Impedance7.8 Ω
  • Nominal Power Handling240 W
  • Continuous power handling380 W
  • Sensitivity (1W/1m)4109.0 dB
  • Frequency Range1.0 - 18.0 kHz
  • Recommended Crossover51.2 kHz
  • Voice Coil Diameter44 mm (1.7 in)
  • Winding MaterialAluminium
  • Inductance0.16 mH
  • Diaphragm MaterialHT Polymer
  • Flux Density1.9 T
  • Magnet MaterialNeodymium Inside Slug

Mounting and Shipping Info

  • Two M5 holes 180° on 57 mm (2.24 in) diameter
  • Overall Diameter90 mm (3.54 in)
  • Depth48 mm (1.89 in)
  • Net Weight0.53 kg (1.16 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 2.83 V for 8 ohms Nominal Impedance.
  • 12 dB/oct. or higher slope high-pass filter.