← Back to SB Acoustics - 5" NRX2 Mid-Woofer - SB15NRX2C30-4
Where the figures for SB15NRX2C30-4 come from
I take every figure from SB Acoustics' own product page or datasheet where I can. This lists where each figure on the SB15NRX2C30-4 page came from.
- 27 from SB Acoustics' product page
- 6 from SB Acoustics' datasheet
- 2 worked out from SB Acoustics' figures
- 1 my estimate
- 3 from NB Audio's listing
General
| Driver type | Mid-Woofer | NB Audio's listing |
|---|---|---|
| Nominal size | 5" | NB Audio's listing |
| Nominal impedance | 4Ω | Maker's product page |
| Power handling (RMS) | 50 W | Maker's product page |
| Sensitivity | 89.5 dB | Maker's product page |
| Frequency range | 40 – 4,500 Hz | Maker's product page |
| Suggested alignment | Ported | NB Audio's listing |
Thiele/Small parameters
| Resonant frequency (Fs) | 34.5 Hz | Maker's product page |
|---|---|---|
| DC resistance (Re) | 3.1 Ω | Maker's product page |
| Voice coil inductance (Le) | 0.12 mH | Maker's product page |
| Mechanical Q (Qms) | 3.58 | Maker's product page |
| Electrical Q (Qes) | 0.3 | Maker's product page |
| Total Q (Qts) | 0.28 | Maker's product page |
| Equivalent volume (Vas) | 20.5 L | Maker's product page |
| Compliance (Cms) | 2.15 mm/N | Maker's product page |
| Moving mass (Mms) | 9.9 g | Maker's product page |
| Mechanical resistance (Rms) | 0.5 kg/s | Maker's product page |
| Force factor (Bl) | 4.7 T·m | Maker's product page |
| Effective piston area (Sd) | 82 cm² | Maker's product page |
| Linear excursion (Xmax, one-way) | 5 mm | Maker's product page |
| Displacement volume (Vd) | 41 cm³ | Worked out from the maker's figures |
| Efficiency bandwidth product (EBP) | 115 | Worked out from the maker's figures |
Motor
| Voice coil height | 15 mm | Maker's product page |
|---|---|---|
| Air gap height | 5 mm | Maker's product page |
| Magnetic flux density | 1 T | Maker's product page |
| Magnet weight | 0.54 kg | Maker's product page |
Mounting
| Overall diameter | 150 mm | Maker's datasheet |
|---|---|---|
| Cutout diameter (suggested) | ≈ 124.9 mm | My estimate, from the maker's drawing |
| Mounting depth | 68.3 mm | Maker's datasheet |
| Flange thickness | 6.5 mm | Maker's datasheet |
| Bolt circle diameter | 138 mm | Maker's datasheet |
| Mounting holes | 4 | Maker's datasheet |
| Mounting hole diameter | 4.3 mm | Maker's datasheet |
| Voice coil diameter | 30.5 mm | Maker's product page |
| Weight | 1.46 kg | Maker's product page |
Materials
| Cone | Norex | Maker's product page |
|---|---|---|
| Surround | Rubber | Maker's product page |
| Voice coil former | Fibreglass | Maker's product page |
| Basket | Cast Aluminium | Maker's product page |
What the labels mean
- Maker's product page: copied from the maker's product page.
- Maker's datasheet: read off the maker's own datasheet or drawing.
- Worked out from the maker's figures: Vd = Sd × Xmax, EBP = Fs ÷ Qes.
- My estimate, from the maker's drawing: measured off the maker's drawing, usually within ±0.3 mm (up to ±0.5). The suggested cutout is the basket's width on the drawing plus 1 mm of clearance (1.5 mm on drivers over 200 mm). Measure before you cut.
- NB Audio's listing: how I've filed it in the store.
Check them yourself: 5″ SB15NRX2C30-4 Datasheet