← Back to Peerless - 6½" HDS Mid-Woofer - P830990
Where the figures for 830990 come from
I take every figure from Peerless' own product page or datasheet where I can. This lists where each figure on the 830990 page came from.
- 29 from Peerless' product page
- 3 from Peerless' datasheet
- 3 worked out from Peerless' figures
- 1 my estimate
- 4 from NB Audio's listing
General
| Driver type | Mid-Woofer | NB Audio's listing |
|---|---|---|
| Nominal size | 6.5" | NB Audio's listing |
| Nominal impedance | 8Ω | Maker's product page |
| Series | Peerless Woofer | NB Audio's listing |
| Power handling (RMS) | 50 W | Maker's product page |
| Sensitivity | 87.6 dB | Maker's product page |
| Suggested alignment | Ported | NB Audio's listing |
Thiele/Small parameters
| Resonant frequency (Fs) | 56 Hz | Maker's product page |
|---|---|---|
| DC resistance (Re) | 6.3 Ω | Maker's product page |
| Minimum impedance (Zmin) | 7.2 Ω | Maker's product page |
| Voice coil inductance (Le) | 0.467 mH | Maker's product page |
| Mechanical Q (Qms) | 2.45 | Maker's product page |
| Electrical Q (Qes) | 0.516 | Maker's product page |
| Total Q (Qts) | 0.43 | Maker's product page |
| Equivalent volume (Vas) | 13.5 L | Maker's product page |
| Compliance (Cms) | 0.47 mm/N | Maker's product page |
| Moving mass (Mms) | 17.5 g | Maker's product page |
| Mechanical resistance (Rms) | 2.513 kg/s | Worked out from the maker's figures |
| Force factor (Bl) | 8.62 T·m | Maker's product page |
| Effective piston area (Sd) | 143 cm² | Maker's product page |
| Linear excursion (Xmax, one-way) | 7.34 mm | Maker's product page |
| Mechanical excursion (Xmech) | 10.2 mm | Maker's product page |
| Displacement volume (Vd) | 105 cm³ | Worked out from the maker's figures |
| Efficiency bandwidth product (EBP) | 108.5 | Worked out from the maker's figures |
Motor
| Motor efficiency factor (β) | 11.9 (T·m)²/Ω | Maker's product page |
|---|---|---|
| Air gap height | 6 mm | Maker's product page |
| Voice coil winding height | 16.7 mm | Maker's product page |
| Voice coil layers | 2 | Maker's product page |
| Voice coil wire | CU | Maker's product page |
| Magnet size (OD × ID × thickness) | 102 × 43 × 20 mm | Maker's product page |
Mounting
| Overall diameter | 182.3 mm | Maker's datasheet |
|---|---|---|
| Faceplate | Round with two flats, Ø182.3 mm, 164.3 mm across the flats | Maker's datasheet |
| Cutout diameter (suggested) | ≈ 146.2 mm | My estimate, from the maker's drawing |
| Mounting depth | 78 mm | Maker's datasheet |
| Voice coil diameter | 32.4 mm | Maker's product page |
| Weight | 1.58 kg | Maker's product page |
Materials
| Cone | Glass Fibre | Maker's product page |
|---|---|---|
| Surround | SBR | Maker's product page |
| Basket | Cast Aluminium | Maker's product page |
| Magnet | Ferrite | 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: Spec Sheet