SB Acoustics
SB Acoustics - 5" NRX2 Mid-Woofer - SB15NRX2C30-8
SB Acoustics - 5" NRX2 Mid-Woofer - SB15NRX2C30-8
In stock
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Description
30mm Voice coil, Norex paper cone. Low damping SBR rubber surround with high exertion and resilience. Open structure cast frame for reduced reflections and compression. Aluminium alloy for light weight, non-magnetic and extra rigidity. Shorting Copper cap on pole piece. Non-inductive CCAW fibre glass 30mm coil former. Silver lead wires. Vented pole piece. Available in 4 or 8Ω version. NRX2 represents the latest iteration of the NRX Series of speaker drivers. The NRX line features proprietary paper cone drivers known as "Norex" as developed by SB Acoustics. During the evolution of newer generation drivers utilising various cone materials such as carbon fibre, polypropylene, aluminium, and ceramic, significant enhancements were also made to the suspension system, damping, voice coil, and coil former. Each new generation has introduced a range of subtle refinements that have accumulated over the years. The NRX2 leverages insights gained from this extensive development, presenting a new yet familiar driver series. It offers improved detail, openness, dynamics, and reduced distortion. In most instances, NRX and NRX2 can be interchanged without requiring any modifications to the crossover.
Features
- Vented cast aluminium chassis for optimum strength and low compression
- Proprietary cone material with natural fibres made in-house
- Soft low damping rubber surround for improved transient response
- Non-conducting fibre glass voice coil former for minimum damping
- Extended copper sleeve on pole piece for low inductance and low distortion
- CCAW voice coil for reduced moving mass
- Long life silver lead wires
- Vented pole piece for reduced compression
Specifications
Specifications
General
| Driver type | Mid-Woofer |
|---|---|
| Nominal size | 5" |
| Nominal impedance | 8Ω |
| Power handling (RMS) | 50 W |
| Sensitivity | 86.5 dB |
| Frequency range | 40 – 4,500 Hz |
| Suggested alignment | Either |
Thiele/Small parameters
| Resonant frequency (Fs) | 36.5 Hz |
|---|---|
| DC resistance (Re) | 5.9 Ω |
| Voice coil inductance (Le) | 0.14 mH |
| Mechanical Q (Qms) | 3.48 |
| Electrical Q (Qes) | 0.37 |
| Total Q (Qts) | 0.34 |
| Equivalent volume (Vas) | 20 L |
| Compliance (Cms) | 2.1 mm/N |
| Moving mass (Mms) | 9.1 g |
| Mechanical resistance (Rms) | 0.6 kg/s |
| Force factor (Bl) | 5.75 T·m |
| Effective piston area (Sd) | 82 cm² |
| Linear excursion (Xmax, one-way) | 5 mm |
| Displacement volume (Vd) | 41 cm³ |
| Efficiency bandwidth product (EBP) | 98.65 |
Motor
| Voice coil height | 15 mm |
|---|---|
| Air gap height | 5 mm |
| Magnetic flux density | 1 T |
| Magnet weight | 0.54 kg |
Mounting
| Overall diameter | 150 mm |
|---|---|
| Cutout diameter (suggested) | ≈ 124.9 mm |
| Mounting depth | 68.3 mm |
| Flange thickness | 6.5 mm |
| Bolt circle diameter | 138 mm |
| Mounting holes | 4 |
| Mounting hole diameter | 4.3 mm |
| Voice coil diameter | 30.5 mm |
| Weight | 1.46 kg |
Materials
| Cone | Norex |
|---|---|
| Surround | Rubber |
| Voice coil former | Fibreglass |
| Basket | Cast Aluminium |
- Xmax is quoted one-way (peak), not peak-to-peak.
- Sensitivity measured at 2.83V/1m.
Downloads
- 5″ SB15NRX2C30-8 Datasheet
- SB15NRX2C30-8 Cutout & Recess Template (NB Audio) Straight off SB Acoustics' spec sheet: flange outline, recess depth, bolt holes. Scaled from SB Acoustics' drawing, so close but not guaranteed exact: cutout. Check it against your driver before you cut.
Where do these figures come from? See the source of each one
