← Back to SB Acoustics - 5x8" SFCR Mid-Woofer - SB15SFCR39-4
Where the figures for SB15SFCR39-4 come from
I take every figure from SB Acoustics' own product page or datasheet where I can. This lists where each figure on the SB15SFCR39-4 page came from.
- 24 from SB Acoustics' product page
- 2 from SB Acoustics' datasheet
- 2 worked out from SB Acoustics' figures
- 3 from NB Audio's listing
General
| Driver type | Mid-Woofer | NB Audio's listing |
|---|---|---|
| Nominal size | 5x8" | NB Audio's listing |
| Nominal impedance | 4Ω | Maker's product page |
| Power handling (RMS) | 80 W | Maker's product page |
| Sensitivity | 90 dB | Maker's product page |
| Suggested alignment | Either | NB Audio's listing |
Thiele/Small parameters
| Resonant frequency (Fs) | 31 Hz | Maker's product page |
|---|---|---|
| DC resistance (Re) | 3.5 Ω | Maker's product page |
| Voice coil inductance (Le) | 0.91 mH | Maker's product page |
| Mechanical Q (Qms) | 6.57 | Maker's product page |
| Electrical Q (Qes) | 0.34 | Maker's product page |
| Total Q (Qts) | 0.32 | Maker's product page |
| Equivalent volume (Vas) | 49.9 L | Maker's product page |
| Compliance (Cms) | 1.11 mm/N | Maker's product page |
| Moving mass (Mms) | 23.6 g | Maker's product page |
| Mechanical resistance (Rms) | 0.7 kg/s | Maker's product page |
| Force factor (Bl) | 6.9 T·m | Maker's product page |
| Effective piston area (Sd) | 178 cm² | Maker's product page |
| Linear excursion (Xmax, one-way) | 5.5 mm | Maker's product page |
| Displacement volume (Vd) | 97.9 cm³ | Worked out from the maker's figures |
| Efficiency bandwidth product (EBP) | 91.18 | Worked out from the maker's figures |
Motor
| Voice coil height | 17 mm | Maker's product page |
|---|---|---|
| Air gap height | 6 mm | Maker's product page |
| Magnetic flux density | 0.94 T | Maker's product page |
| Magnet weight | 0.54 kg | Maker's product page |
Mounting
| Faceplate | Not round, 153 × 252.8 mm (see the maker's drawing) | Maker's datasheet |
|---|---|---|
| Mounting depth | 84 mm | Maker's datasheet |
| Voice coil diameter | 38.5 mm | Maker's product page |
| Weight | 1.65 kg | Maker's product page |
Materials
| Cone | Paper | Maker's product page |
|---|---|---|
| Surround | Rubber | Maker's product page |
Not on file: Outside diameter, Cutout, Bolt circle, Flange thickness. Either the maker doesn't publish it or I haven't found it yet.
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.
- NB Audio's listing: how I've filed it in the store.
Check them yourself: 5×8″ SBSB15SFCR39-4 Datasheet