← Back to Dayton Audio - 5¼" Midbass Driver - ND140-8
Where the figures for ND140-8 come from
I take every figure from Dayton Audio's own product page or datasheet where I can. This lists where each figure on the ND140-8 page came from.
- 27 from Dayton Audio's product page
- 3 from Dayton Audio's datasheet
- 3 worked out from Dayton Audio's figures
- 4 from NB Audio's listing
General
| Driver type | Mid-Woofer | NB Audio's listing |
|---|---|---|
| Nominal size | 5.25" | NB Audio's listing |
| Nominal impedance | 8Ω | Maker's product page |
| Series | ND | NB Audio's listing |
| Power handling (RMS) | 40 W | Maker's product page |
| Power handling (program) | 80 W | Maker's product page |
| Sensitivity | 84.54 dB | Maker's product page |
| Frequency range | 54 – 8,000 Hz | Maker's product page |
| Suggested alignment | Either | NB Audio's listing |
Thiele/Small parameters
| Resonant frequency (Fs) | 56.5 Hz | Maker's product page |
|---|---|---|
| DC resistance (Re) | 7.8 Ω | Maker's product page |
| Voice coil inductance (Le) | 1.44 mH | Maker's product page |
| Mechanical Q (Qms) | 5.01 | Maker's product page |
| Electrical Q (Qes) | 0.79 | Maker's product page |
| Total Q (Qts) | 0.68 | Maker's product page |
| Equivalent volume (Vas) | 7.74 L | Maker's product page |
| Compliance (Cms) | 0.76 mm/N | Maker's product page |
| Moving mass (Mms) | 10.4 g | Maker's product page |
| Mechanical resistance (Rms) | 0.7369 kg/s | Worked out from the maker's figures |
| Force factor (Bl) | 6.05 T·m | Maker's product page |
| Effective piston area (Sd) | 86.6 cm² | Maker's product page |
| Linear excursion (Xmax, one-way) | 4 mm | Maker's product page |
| Displacement volume (Vd) | 34.64 cm³ | Worked out from the maker's figures |
| Efficiency bandwidth product (EBP) | 71.52 | Worked out from the maker's figures |
Motor
| Voice coil wire | Copper | Maker's product page |
|---|
Mounting
| Overall diameter | 154.5 mm | Maker's datasheet |
|---|---|---|
| Faceplate | Not round (see the maker's drawing) | Maker's datasheet |
| Cutout diameter | 120 mm | Maker's product page |
| Mounting depth | 62.5 mm | Maker's datasheet |
| Voice coil diameter | 25 mm | Maker's product page |
| Weight | 0.4309 kg | Maker's product page |
| Mounting holes | 4 | Maker's product page |
Materials
| Cone | Black Anodised Aluminium | Maker's product page |
|---|---|---|
| Surround | Rubber | Maker's product page |
| Voice coil former | Kapton® / Polyimide | Maker's product page |
| Basket | Steel | Maker's product page |
| Magnet | Neodymium | 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.
- NB Audio's listing: how I've filed it in the store.
Check them yourself: Dayton Audio ND140-8 Specification Sheet