← Back to Scan-Speak - 1" Classic Dome Tweeter - D2905/950000
Where the figures for D2905/950000 come from
I take every figure from Scan-Speak's own product page or datasheet where I can. This lists where each figure on the D2905/950000 page came from.
- 9 from Scan-Speak's product page
- 28 from Scan-Speak's datasheet
- 2 worked out from Scan-Speak's figures
- 3 from NB Audio's listing
General
| Driver type | Tweeter | NB Audio's listing |
|---|---|---|
| Nominal size | 1" | NB Audio's listing |
| Nominal impedance | 6Ω | Maker's datasheet |
| Series | Classic | NB Audio's listing |
| Power handling (RMS) | 150 W | Maker's datasheet |
| Power handling (program) | 460 W | Maker's datasheet |
| Sensitivity | 90 dB | Maker's product page |
| Frequency range | 2,500 – 20,000 Hz | Maker's datasheet |
| Recommended crossover | 2. order HP Butterworth, 2.5 kHz | Maker's datasheet |
Thiele/Small parameters
| Resonant frequency (Fs) | 550 Hz | Maker's product page |
|---|---|---|
| DC resistance (Re) | 4.7 Ω | Maker's product page |
| Minimum impedance (Zmin) | 5.5 Ω | Maker's datasheet |
| Voice coil inductance (Le) | 0.07 mH | Maker's datasheet |
| Mechanical Q (Qms) | 1.04 | Maker's datasheet |
| Electrical Q (Qes) | 0.6 | Maker's datasheet |
| Total Q (Qts) | 0.38 | Maker's product page |
| Equivalent volume (Vas) | 0.02 L | Maker's product page |
| Compliance (Cms) | 0.19 mm/N | Maker's datasheet |
| Moving mass (Mms) | 0.45 g | Maker's datasheet |
| Mechanical resistance (Rms) | 1.5 kg/s | Maker's datasheet |
| Force factor (Bl) | 3.5 T·m | Maker's product page |
| Effective piston area (Sd) | 8.5 cm² | Maker's product page |
| Linear excursion (Xmax, one-way) | 0.4 mm | Maker's datasheet |
| Mechanical excursion (Xmech) | 1.5 mm | Maker's datasheet |
| Displacement volume (Vd) | 0.34 cm³ | Worked out from the maker's figures |
| Efficiency bandwidth product (EBP) | 916.7 | Worked out from the maker's figures |
| Effective piston diameter (D) | 33 mm | Maker's datasheet |
| Impedance at resonance (Zo) | 12.9 Ω | Maker's datasheet |
Motor
| Voice coil height | 3.3 mm | Maker's datasheet |
|---|---|---|
| Air gap height | 2.5 mm | Maker's datasheet |
| Voice coil layers | 2 | Maker's datasheet |
Mounting
| Overall diameter | 104.3 mm | Maker's datasheet |
|---|---|---|
| Mounting depth | 41.3 mm | Maker's datasheet |
| Flange thickness | 3.1 mm | Maker's datasheet |
| Bolt circle diameter | 90 mm | Maker's datasheet |
| Mounting holes | 4 | Maker's datasheet |
| Mounting hole diameter | 5 mm | Maker's datasheet |
| Volume displaced by driver | 0.15 L | Maker's datasheet |
| Voice coil diameter | 28 mm | Maker's datasheet |
| Weight | 0.7 kg | Maker's datasheet |
Materials
| Cone | Textile | Maker's product page |
|---|---|---|
| Magnet | Ferrite | Maker's product page |
Not on file: Cutout. 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: Datasheet