SB Acoustics 4 SB12MNRX25-4 Midrange

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SB Acoustics 4 SB12MNRX25-4 Midrange

Key features
  • Proprietary cone material with natural fibres made in-house
  • Shortened voice coil optimized for pure midrange reproduction
  • High damping Butyl rubber surround for non-resonant sound character
  • Vented pole piece for reduced compression
  • Vented cast aluminium chassis for optimum strength and low compression
  • CCAW voice coil for reduced moving mass
  • Long life silver lead wires
  • Non-conducting fibre glass coil former for minimum damping

Short data

Usage as Midrange
Power Handling 50 Watt
Impedance 4 Ohm
Frequency from 150 Hz
Max. Frequency 10 kHz
Sound pressure 88.5 dB


Overall dimensions 123 mm
Baffle cutout 98.2 mm
Depth (Total) 79.1 mm
Voice coil Ø 25.4 mm
Voice coil height 9.5 mm
Air gap height 5 mm
Magnet Ø 70 mm
Magnet-weight 40 g


Resonance fs fs: 58 Hz
Mechanical Q Qms: 3.6
Electrical Q Qes: 0.42
Total Q Qts: 0.37
Equivalent Air-Volumen Vas: 5.5 Liter
DC-Resistance Re: 3.2 Ohm
Coil Inductance Le: 0.14 mH
Mech. Compliance Cms: 1.55 mm/N
Moving Mass Mms: 4.9 g
mech. Resistance Rms: 0.5 kg/s-¹
Max. Excursion +/- Xmax: 4.5 mm
BL Product Bl: 3.7 N/A
Membrane Area Sd: 50 cm²
Sound pressure dB: 88.5 SPL

Frequency & Impedance

Technical Dimensions

PDF-Product information

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