SB Acoustics SB12MNRX2-25-4 4'' Midrange

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
• Shorting ring in motor system for reduced distortion

Specifications:

• Nominal Impedance 4 ?
• DC resistance, Re 3.2 ?
• Voice coil inductance, Le 0.15 mH
• Effective piston area, Sd 50 cm²
• Voice coil diameter 25.4 mm
• Voice coil height 9.4 mm
• Air gap height 5 mm
• Linear coil travel (p-p) 4.4 mm
• Magnetic flux density 1.03 T
• Magnet weight 0.4 kg
• Net weight 0.92 kg
• Free air resonance, Fs 63.5 Hz
• Sensitivity (2.83V/1m) 90.5 dB
• Mechanical Q-factor, Qms 4.19
• Electrical Q-factor, Qes 0.35
• Total Q-factor, Qts 0.32
• Moving mass incl. air,Mms 4.2 g
• Force factor, Bl 3.9 Tm
• Equivalent volume, Vas 5.3 liters
• Compliance, Cms 1.5 mm/N
• Mechanical loss, Rms 0.4 kg/s
• Rated power handling* 50 W

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