SB Acoustics SB17NRX2C35-8 Mid-Woofer, Norex

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SB Acoustics SB17NRX2C35-8 Mid-Woofer, Norex

  • Vented cast aluminum chassis for optimum strength and low compression
  • Proprietary cone material with natural fibers made in-house
  • Soft low damping rubber surround for transient response
  • Non-conducting fiber glass voice coil former for minimum damping
  • Extended copper sleeve on pole piece for low inductance and low distortion
  • Vented coil former
  • CCAW voice coil for reduced moving mass
  • Long life silver lead wires
  • Vented pole piece for reduced compression
  • Nominal Impedance 8 Ω
  • DC resistance, Re 5.7 Ω
  • Voice coil inductance, Le 0.15 mH
  • Effective piston area, Sd 118 cm2
  • Voice coil diameter 35.5 mm
  • Voice coil height 16 mm
  • Air gap height 5 mm
  • Linear coil travel (p-p) 11 mm
  • Magnetic flux density 0.93 T
  • Magnet weight 0.54 kg
  • Net weight 1.56 kg
  • Free air resonance, Fs 36.5 Hz
  • Sensitivity (2.83V/1m) 87 dB
  • Mechanical Q-factor, Qms 4.55
  • Electrical Q-factor, Qes 0.47
  • Total Q-factor, Qts 0.42
  • Moving mass incl. air,Mms 13.9 g
  • Force factor, Bl 6.25 Tm
  • Equivalent volume, Vas 27 liters
  • Compliance, Cms 1.37 mm/N
  • Mechanical loss, Rms 0.7 kg/s
  • Rated power handling* 50 W
* IEC 268-5, T/S parameters measured on drive units that are broken in.

Short data

Usage as Bass-Midrange
Power Handling 50 Watt
Impedance 8 Ohm
Frequency from 36 Hz
Max. Frequency 3 kHz


Overall dimensions 171 mm
Baffle cutout 114.9 mm
Depth (Total) 85.9 mm
Front material Aluminium
Frame Material Aluminium diecast
Membrane Type Cone
Membrane Surround Rubber
Dustcap Material Paper
Voice coil Ø 35.5 mm
Voice coil height 16 mm
Voice coil material CCAW
Air gap height 5 mm
Magnet-weight 0.54 g
Magnet-inductance 0.93 T


Resonance fs fs: 36.5 Hz
Mechanical Q Qms: 4.55
Electrical Q Qes: 0.47
Total Q Qts: 0.42
Equivalent Air-Volumen Vas: 27 Liter
DC-Resistance Re: 5.7 Ohm
Coil Inductance Le: 0.15 mH
Mech. Compliance Cms: 1.37 mm/N
Moving Mass Mms: 13.9 g
mech. Resistance Rms: 0.7 kg/s-¹
Max. Excursion +/- Xmax: 11 mm
BL Product Bl: 6.25 N/A
Membrane Area Sd: 118 cm²
Sound pressure dB: 87 SPL

Frequency (EN)

Technical Drawing

PDF-Product information

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