4″ SB12NRX25-8 / Norex
Features
- 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
Additional information
| Nominal Impedance | 8 Ω |
|---|---|
| DC resistance | Re 6.4 Ω |
| Voice coil inductance | Le 0.34 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 | 1.07 T |
| Magnet weight | 0.40 kg |
| Net Weight | 0.92 kg |
| Free air resonance | Fs 57 Hz |
| Sensitivity | (2.83 V / 1 m) 85.5 dB |
| Mechanical Q-factor | Qms 4.1 |
| Electrical Q-factor | Qes 0.41 |
| Total Q-factor | Qts 0.37 |
| Moving mass incl. air | Mms 5.2 g |
| Force factor | Bl 5.4 Tm |
| Equivalent volume | VAS 5.3 liters |
| Compliance | Cms 1.49 mm/N |
| Mechanical loss | Rms 0.45 kg/s |
| Rated power handling | * 30 W |
| Note | * IEC 268-5, T/S parameters measured on drive units that are broken in. |
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