← Back to Dayton Audio - 18" Odeum Subwoofer - 18SW1200F-8
Where the figures for 18SW1200F-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 18SW1200F-8 page came from.
- 28 from Dayton Audio's product page
- 3 worked out from Dayton Audio's figures
- 1 my estimate
- 4 from NB Audio's listing
General
| Driver type | Subwoofer | NB Audio's listing |
|---|---|---|
| Nominal size | 18" | NB Audio's listing |
| Nominal impedance | 8Ω | Maker's product page |
| Series | Odeum | NB Audio's listing |
| Power handling (RMS) | 1,200 W | Maker's product page |
| Power handling (program) | 2,400 W | Maker's product page |
| Sensitivity | 96.4 dB | Maker's product page |
| Frequency range | 30 – 1,000 Hz | Maker's product page |
| Suggested alignment | Either | NB Audio's listing |
Thiele/Small parameters
| Resonant frequency (Fs) | 32 Hz | Maker's product page |
|---|---|---|
| DC resistance (Re) | 6.5 Ω | Maker's product page |
| Voice coil inductance (Le) | 2.25 mH | Maker's product page |
| Mechanical Q (Qms) | 8.97 | Maker's product page |
| Electrical Q (Qes) | 0.42 | Maker's product page |
| Total Q (Qts) | 0.4 | Maker's product page |
| Equivalent volume (Vas) | 287.7 L | Maker's product page |
| Compliance (Cms) | 0.13 mm/N | Maker's product page |
| Moving mass (Mms) | 193.6 g | Maker's product page |
| Mechanical resistance (Rms) | 4.34 kg/s | Worked out from the maker's figures |
| Force factor (Bl) | 24.44 T·m | Maker's product page |
| Effective piston area (Sd) | 1,200 cm² | Maker's product page |
| Linear excursion (Xmax, one-way) | 10.6 mm | Maker's product page |
| Displacement volume (Vd) | 1,272 cm³ | Worked out from the maker's figures |
| Efficiency bandwidth product (EBP) | 76.19 | Worked out from the maker's figures |
Motor
| Voice coil wire | Copper | Maker's product page |
|---|
Mounting
| Overall diameter | 462 mm | Maker's product page |
|---|---|---|
| Cutout diameter | 414 mm | Maker's product page |
| Mounting depth | 193 mm | Maker's product page |
| Flange thickness (estimate) | ≈ 16.9 mm | My estimate, from the maker's drawing |
| Mounting holes | 8 | Maker's product page |
| Voice coil diameter | 101.6 mm | Maker's product page |
Materials
| Cone | Coated Paper | Maker's product page |
|---|---|---|
| Surround | Paper | Maker's product page |
| Voice coil former | Aluminium | Maker's product page |
| Basket | Steel | Maker's product page |
| Magnet | Ferrite | Maker's product page |
Not on file: Bolt circle, Weight. 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.
- 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: Dayton Audio Apollo 18F Specification Sheet