8″ SB23NRXS45-8 / Norex


  • Soft low damping rubber surround for improved transient response
  • Shorting ring in motor system for reduced distortion
  • Vented pole piece for reduced compression
  • Vented cast aluminum chassis for optimum strength and low compression
  • Shallow design
  • Non-conducting fiber glass voice coil former for minimum damping
  • CCAW voice coil for reduced moving mass
  • Long life silver lead wires
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Additional information

Nominal Impedance

8 Ω

DC resistance

Re 5.6 Ω

Voice coil inductance

Le 0.60 mH

Effective piston area

Sd 216 cm2

Voice coil diameter

45.5 mm

Voice coil height

19 mm

Air gap height

6 mm

Linear coil travel (p-p)

13 mm

Magnetic flux density

0.86 T

Magnet weight

0.8 kg

Net Weight

2.74 kg

Free air resonance

Fs 27 Hz


(2.83V/1m) 88.5 dB

Mechanical Q-factor

Qms 5.4

Electrical Q-factor

Qes 0.41

Total Q-factor

Qts 0.38

Moving mass incl. air

Mms 24.5 g

Force factor

Bl 7.5 Tm

Equivalent volume

Vas 94 liters


Cms 1.42 mm/N

Mechanical loss

Rms 0.77 kg/s

Rated power handling

60 W


* IEC 268-5, T/S parameters measured on drive units that are broken in.



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