1,5-inch driver for budget projects
Unique patented design
113 dB sensitivity 1W / 1m
1 kHz crossover
Extended high frequency response up to 20 kHz
Very small size and low weight
44,4 mm voice coil

BMS 4555 is a powerful 1,5" professional compression driver that delivers excellent sonic quality in a small package. It has an exceptional dynamic range and produces even the most complex music signals with depth and definition.

The BMS exclusive voice coil technology employs a light weigh Cooper Clad Aluminium wire wound inside and outside of the KaptonTM former to improve the heat dissipation, dramatically increasing the acoustic output and reliability of the driver while minimizes the power compression.

The BMS 4555 – 1,5" compression driver is designed for a wide variety of applications including budget projects requiring 1,5" driver of high sonic quality.

The 4555 offers all the benefits of the patented BMS compression driver in a 1,5" format, but at much reduced cost.

Specifications 4555
Throat diameter 1,5" (38 mm)
Nominal impedance 8 or 16 Ohm
Power capacity (AES) 80 W
Peak power 450 W

Sensitivity in:
CD Horn 90°x75°, 1W / 1m 113 dB
Plane wave tube, 1mW 118 dB
Maximal SPL (cont.) 132 dB aha_at 80 W
Frequency range 500 - 20.000 Hz
Recommended crossover 1.000 Hz
Voice coil diameter 1,75" (44,4 mm)
Magnet material Ceramic
Flux density 2,0 T
Voice coil material Cooper Clad Aluminium
Voice coil former Kapton
Diaphragm material Polyester

Mounting information
Overall Diameter 123 mm
Depth 52 mm
Net weight 2,25 kg
Four M6 holes, 90° on 101,6 mm, 4" diameter