← Back to SB Audience - 12" NERO Mid-Woofer - NERO-12MWN400D
Where the figures for NERO-12MWN400D come from
I take every figure from SB Audience's own product page or datasheet where I can. This lists where each figure on the NERO-12MWN400D page came from.
- 44 from SB Audience's datasheet
- 2 worked out from SB Audience's figures
- 1 my estimate
- 4 from NB Audio's listing
General
| Driver type | Mid-Woofer | NB Audio's listing |
|---|---|---|
| Nominal size | 12" | NB Audio's listing |
| Nominal impedance | 8Ω | Maker's datasheet |
| Series | SB Pro-mid woofers | NB Audio's listing |
| Power handling (RMS) | 400 W | Maker's datasheet |
| Power handling (program) | 800 W | Maker's datasheet |
| Sensitivity | 96 dB | Maker's datasheet |
| Frequency range | 66 – 6,000 Hz | Maker's datasheet |
| Suggested alignment | Ported | NB Audio's listing |
| Cone surround | Triple roll with damping glue | Maker's datasheet |
| Spider profile | Single constant height waves | Maker's datasheet |
| Weather resistant | Yes | Maker's datasheet |
| Recone kit | 1P000OPSB012 | Maker's datasheet |
Thiele/Small parameters
| Resonant frequency (Fs) | 66 Hz | Maker's datasheet |
|---|---|---|
| DC resistance (Re) | 5.4 Ω | Maker's datasheet |
| Minimum impedance (Zmin) | 5.3 Ω | Maker's datasheet |
| Voice coil inductance (Le) | 0.19 mH | Maker's datasheet |
| Mechanical Q (Qms) | 8.98 | Maker's datasheet |
| Electrical Q (Qes) | 0.55 | Maker's datasheet |
| Total Q (Qts) | 0.52 | Maker's datasheet |
| Equivalent volume (Vas) | 31.1 L | Maker's datasheet |
| Compliance (Cms) | 0.07 mm/N | Maker's datasheet |
| Moving mass (Mms) | 78.8 g | Maker's datasheet |
| Mechanical resistance (Rms) | 3.63 kg/s | Maker's datasheet |
| Force factor (Bl) | 17.8 T·m | Maker's datasheet |
| Effective piston area (Sd) | 543.3 cm² | Maker's datasheet |
| Linear excursion (Xmax, one-way) | 7.13 mm | Maker's datasheet |
| Mechanical excursion (Xmech) | 9 mm | Maker's datasheet |
| Displacement volume (Vd) | 387.4 cm³ | Worked out from the maker's figures |
| Efficiency bandwidth product (EBP) | 120 | Worked out from the maker's figures |
| Reference efficiency (η0) | 1.55 % | Maker's datasheet |
Motor
| Voice coil height | 17.6 mm | Maker's datasheet |
|---|---|---|
| Air gap height | 10 mm | Maker's datasheet |
| Magnetic flux density | 1.07 T | Maker's datasheet |
| Voice coil wire | Copper | Maker's datasheet |
| Voice coil type | Interleaved sandwich | Maker's datasheet |
| Demodulation | Extended copper cap | Maker's datasheet |
Mounting
| Overall diameter | 322.5 mm | Maker's datasheet |
|---|---|---|
| Cutout diameter | 287 mm | Maker's datasheet |
| Mounting depth | 133 mm | Maker's datasheet |
| Flange thickness (estimate) | ≈ 6.5 mm | My estimate, from the maker's drawing |
| Bolt circle diameter | 306.5 mm | Maker's datasheet |
| Mounting holes | 8 | Maker's datasheet |
| Mounting hole diameter | 6.9 mm | Maker's datasheet |
| Volume displaced by driver | 2.15 L | Maker's datasheet |
| Voice coil diameter | 75 mm | Maker's datasheet |
| Weight | 4.15 kg | Maker's datasheet |
| Flange and gasket thickness | 12 mm | Maker's datasheet |
Materials
| Voice coil former | Fibreglass | Maker's datasheet |
|---|---|---|
| Basket | Cast Aluminium | Maker's datasheet |
| Magnet | Neodymium | Maker's datasheet |
What the labels mean
- 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). Measure before you cut.
- NB Audio's listing: how I've filed it in the store.
Check them yourself: Datasheet