SB12NRX25-4 4" Midrange Woofer

The SB Acoustics SB12NRX25-4 4" Midwoofer is an excellent SB Acoustics Ferrite magnet midrange/midwoofer, featuring a high efficiency low damping rubber surround.

€56.95
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Highlights

  • Proprietary cone material with natural fibres made in-house
  • 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

 

Product details

SB Acoustics SB12NRX25-4 4" Midrange Woofer

The SB Acoustics SB12NRX25-4 4" Midwoofer is an excellent SB Acoustics Ferrite magnet midrange/midwoofer, featuring a high efficiency low damping rubber surround. Fitted with a proprietary composition paper cone, 1" voice coil. Very open cast frame for minimal reflections. Fs 55Hz, good level extended response up to 5KHz.

SISB12NRX254

Data sheet

Impedance
4 Ohm
Driver type
Midwoofer
Sensitivity
87.5 dB 2.83V/1m
Resonance frequency (fs)
55 Hz
DC resistance (Re)
3.1 ohms
Mechanical Q (Qms)
3.2
Electrical Q at Fs (Qes)
0.46
Total Q factor (Qts)
0.40
Speaker diameter
4"
Voice coil inductance (L)
0.14 mH
Effective mechanical mass incl air load (mms)
5.6 g
Effective piston radiating area (Sd)
50 cm2
Force factor (BL)
3.6 Tm
Equivalent volume of compliance (Vas)
0.19 ft.³