• Extended bandwidth (300 - 22000 Hz)
  • Neodymium Magnet assembly
  • Additional shorting rings for lower distortion
  • With two subsystems in one, each driver covers a smaller frequency range for increased power handling, high dynamic and extremely low distortion
  • Excellent Phase Coherence
  • Perfect Time Alignment without problems of Multi-Source Interference
  • Ultra light weight and small size
  • 8 or 16 ohms


In a conventional full range compression driver the phase plug must be located extremely close to the diaphragm, excursion of the diaphragm is limited and middle frequency performance is compromised. A typical large diaphragm dome compression driver has a limited high frequency response Over 8 kHz the dome diaphragm breaks up causing resonance and harsh, metallic sound.

The patented design of the BMS 4594HE is a result of extensive dedicated research and development providing dramatic improvement in dynamic response, clarity and transparency. The BMS annular midrange diaphragm covers the frequency range between 300 and 7.000 Hz with a smooth, linear response. The large diaphragm excursion of max. +/-0,8 mm results in high output and increased power handling up to 1.300 W peak.


Product type
High-frequency Drivers

Nominal Diameter
1.4 "

Nominal Diameter
36 mm

Overall diameter
132 (± 3) mm

94 mm

2,3 kg

Sensitivity (horn 1 W / 1 m)
118 dB

Mounting holes

Diameter of fixing holes

Pitch Circle Diameter
101.6 mm

passive crossover

Features Midrange driver

Midrange voice coil
3.5 "

Midrange voice coil
90 mm

Nominal Impedance Midrange
8 / 16 Ohm(s)

Nominal Load Midrange
150 W

Maximum Load Midrange
1000 W

Frequency range Midrange
300 - 7000 Hz

recommended crossover frequency Midrange
300 Hz

Voice Coil Carrier Midrange

Diaphragm material Midrange

Midrange magnet

HF Driver characteristics

HF driver voice coil
1.75 "

HF Driver Voice Coil
44.4 mm

Nominal Impedance HF driver
8 Ohm(s)

Nominal Load HF driver
80 W

Maximum Load HF driver
320 W

Frequency range HF driver
6000 - 22000 Hz

recommended crossover frequency HF driver
6300 Hz

Voice Coil Carrier HF driver

Diaphragm material HF driver

HF driver magnet