4″ SB12PACR25-4 / Aluminum
Features
- Vented reinforced plastic chassis
- Anodised aluminium cone
- Low damping rubber surround
- Large vented motor system
- Long stroke linear suspension
- Light weight CCAW voice coil
- Non-conducting fibreglass coil former
- Non-resonant long life lead wires
Specs
- Nominal Impedance 4 Ω
- DC resistance, Re 3.1 Ω
- Voice coil inductance, Le 0.25 mH
- Effective piston area, Sd 50 cm2
- Voice coil diameter 25.4 mm
- Voice coil height 15 mm
- Air gap height 5 mm
- Linear coil travel (p-p) 10 mm
- Magnetic flux density 1.03 T
- Magnet weight 0.40 kg
- Net weight 0.86 kg
- Free air resonance, Fs 52.5 Hz
- Sensitivity (2.83 V / 1 m) 87 dB
- Mechanical Q-factor, Qms 5.0
- Electrical Q-factor, Qes 0.33
- Total Q-factor, Qts 0.31
- Moving mass incl. air, Mms 6.1 g
- Force factor, Bl 4.35 Tm
- Equivalent volume, VAS 5.3 liters
- Compliance, Cms 1.50 mm/N
- Mechanical loss, Rms 0.4 kg/s
- Rated power handling* 30 W
* IEC 268-5, T/S parameters measured on drive units that are broken in.