SB Acoustics SB12MNRX2-25-4 4'' Midrange
- 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
Product Specifications
| Nominal Impedance | 4 ohms |
| DC resistence,Re | 3.2 ohms |
| voice coil inductance,Le | 0.15 mH |
| 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,BI | 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* | 50W |
| 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 |
| Magnetic weight | 0.4 Kg |
| Net weight | 0.92 Kg |
Frequency and Impedance Graph:
Drawing:
