← Back to Peerless - 8" NE Subwoofer Neo - NE225W-04
Where the figures for NE225W-04 come from
I take every figure from Peerless' own product page or datasheet where I can. This lists where each figure on the NE225W-04 page came from.
- 23 from Peerless' datasheet
- 3 worked out from Peerless' figures
- 2 my estimate
- 1 not yet checked
- 4 from NB Audio's listing
General
| Driver type | Subwoofer | NB Audio's listing |
|---|---|---|
| Nominal size | 8" | NB Audio's listing |
| Nominal impedance | 4Ω | Maker's datasheet |
| Series | Peerless Woofer | NB Audio's listing |
| Power handling (RMS) | 125 W | Maker's datasheet |
| Sensitivity | 88.2 dB | Maker's datasheet |
| Suggested alignment | Either | NB Audio's listing |
Thiele/Small parameters
| Resonant frequency (Fs) | 37 Hz | Maker's datasheet |
|---|---|---|
| DC resistance (Re) | 3 Ω | Maker's datasheet |
| Minimum impedance (Zmin) | 3.8 Ω | Maker's datasheet |
| Voice coil inductance (Le) | 0.269 mH | Maker's datasheet |
| Mechanical Q (Qms) | 10.3 | Maker's datasheet |
| Electrical Q (Qes) | 0.386 | Maker's datasheet |
| Total Q (Qts) | 0.37 | Maker's datasheet |
| Equivalent volume (Vas) | 34.4 L | Maker's datasheet |
| Compliance (Cms) | 0.47 mm/N | Maker's datasheet |
| Moving mass (Mms) | 39.1 g | Maker's datasheet |
| Mechanical resistance (Rms) | 0.8825 kg/s | Worked out from the maker's figures |
| Force factor (Bl) | 8.42 T·m | Maker's datasheet |
| Effective piston area (Sd) | 227 cm² | Maker's datasheet |
| Linear excursion (Xmax, one-way) | 10.3 mm | Maker's datasheet |
| Mechanical excursion (Xmech) | 16.2 mm | Maker's datasheet |
| Displacement volume (Vd) | 233.8 cm³ | Worked out from the maker's figures |
| Efficiency bandwidth product (EBP) | 95.85 | Worked out from the maker's figures |
Motor
| Magnet weight | 1.86 kg | My earlier listing, not yet checked |
|---|
Mounting
| Overall diameter | 224.8 mm | Maker's datasheet |
|---|---|---|
| Cutout diameter (suggested) | ≈ 188.0 mm | My estimate, from the maker's drawing |
| Mounting depth (estimate) | ≈ 107.0 mm | My estimate, from the maker's drawing |
| Bolt circle diameter | 212.2 mm | Maker's datasheet |
| Mounting holes | 5 | Maker's datasheet |
| Mounting hole diameter | 4.2 mm | Maker's datasheet |
| Voice coil diameter | 51.3 mm | Maker's datasheet |
| Weight | 1.84 kg | Maker's datasheet |
Not on file: Flange thickness. Either the maker doesn't publish it or I haven't found it yet.
What the labels mean
- 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.
- My earlier listing, not yet checked: from the listing I had before I started checking figures against makers. Treat it as a guide until it's checked.
- NB Audio's listing: how I've filed it in the store.
Check them yourself: Tymphany datasheet (2026)