BMS 4591 is a 2-inch 8 ohm compression driver rated at 150 W RMS. The source-backed specifications include sensitivity 118 dB, range from 200 Hz, to 9000 Hz, throat 50.8 mm. bits tracks vendor pricing and datasheet links from the same loudspeaker database.
Source-backed specifications
Motor and cone
Voice coil
90mm
Power and response
Sensitivity
118dB
Power
150W
Impedance
8Ω
Range
200–9000Hz
Crossover
300Hz
Throat
51mm
Size and mounting
Diameter
182mm
Depth
90mm
Weight
6kg
Other published values
Power Peak
1000
Everything else BMS lists
HF
SPL
118dB
Power
150W
Impedance
8Ω
Power Peak
1000
Sensitivity
118dB
Low limit
200Hz
High limit
9000Hz
Throat
51mm
Manufacturer sensitivity
118dB
Voice coil
90mm
Crossover
300Hz
6. 1 w / 1 m
118 dB
4. peak power
1000 W peak above 500 Hz
13. efficiency
35 % (300 – 5000 Hz)
1. throat diameter
2″ (50.8 mm)
7. frequency range
200 – 9000 Hz
11. magnet material
Ferrite
5. max. spl (cont.)
136 dB at 150 W
15. voice coil former
Kapton TM
2. nominal impendance
8 or 16 Ohm
16. diaphragm material
Polyester
10. voice coil diameter
3.5″ (90 mm)
14. voice coil material
Copper Clad Aluminum
3. power capacity (aes)
150 W AES above 400 Hz
12. flux density (tesla)
1.95
8. recommended crossover
300 Hz
9. min. impedance modulus
8.3
02
Where to buy
Prices for delivery to the UK, including VAT. How prices work