← Back to SB Acoustics - 6" PFC Mid-Woofer - SB16PFC25-8
Where the figures for SB16PFC25-8 come from
I take every figure from SB Acoustics' own product page or datasheet where I can. This lists where each figure on the SB16PFC25-8 page came from.
- 25 from SB Acoustics' product page
- 3 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 | 6" | NB Audio's listing |
| Nominal impedance | 8Ω | Maker's product page |
| Power handling (RMS) | 40 W | Maker's product page |
| Sensitivity | 87 dB | Maker's product page |
| Suggested alignment | Either | NB Audio's listing |
Thiele/Small parameters
| Resonant frequency (Fs) | 38 Hz | Maker's product page |
|---|---|---|
| DC resistance (Re) | 5.6 Ω | Maker's product page |
| Voice coil inductance (Le) | 0.77 mH | Maker's product page |
| Mechanical Q (Qms) | 2.5 | Maker's product page |
| Electrical Q (Qes) | 0.48 | Maker's product page |
| Total Q (Qts) | 0.4 | Maker's product page |
| Equivalent volume (Vas) | 27 L | Maker's product page |
| Compliance (Cms) | 1.25 mm/N | Maker's product page |
| Moving mass (Mms) | 13.8 g | Maker's product page |
| Mechanical resistance (Rms) | 1.4 kg/s | Maker's product page |
| Force factor (Bl) | 6.2 T·m | Maker's product page |
| Effective piston area (Sd) | 124 cm² | Maker's product page |
| Linear excursion (Xmax, one-way) | 4.5 mm | Maker's product page |
| Displacement volume (Vd) | 55.8 cm³ | Worked out from the maker's figures |
| Efficiency bandwidth product (EBP) | 79.17 | Worked out from the maker's figures |
Motor
| Voice coil height | 14 mm | Maker's product page |
|---|---|---|
| Air gap height | 5 mm | Maker's product page |
| Magnetic flux density | 1.07 T | Maker's product page |
| Magnet weight | 0.36 kg | Maker's product page |
Mounting
| Overall diameter | 183 mm | Maker's datasheet |
|---|---|---|
| Faceplate | Not round (see the maker's drawing) | Maker's datasheet |
| Cutout diameter (suggested) | ≈ 145.5 mm | My estimate, from the maker's drawing |
| Mounting depth | 76.7 mm | Maker's datasheet |
| Voice coil diameter | 25.4 mm | Maker's product page |
| Weight | 0.96 kg | Maker's product page |
Materials
| Cone | Paper | Maker's product page |
|---|---|---|
| Surround | Rubber | Maker's product page |
| Basket | Reinforced Plastic | Maker's product page |
Not on file: 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.
- 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: 6″ SB16PFC25-8 Datasheet