Tannoy HPD 315A
Thiele-Small parameters
| Nominal size | 12" |
|---|---|
| Impedance | 8 Ω |
| Fs | 25 Hz |
| Qts | 0.195 |
| Qes | 0.22 |
| Qms | 1.75 |
| Vas | 276 L |
| Sd | 550 cm² |
| Xmax | 3 mm |
| Re | 5.5 Ω |
| Bl | 15.6 T·m |
| Mms | 62.3 g |
| Pe | 60 W |
| Sensitivity | 96.5 dB |
Alignment hint
| EBP | 114 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 22.7 L |
EBP > 100: favours a ported (bass-reflex) alignment.
Rules of thumb from T/S parameters only. Verify against a real simulation before cutting wood.
Substitute candidates
| Driver | Fs (Hz) | Qts | Vas (L) | Xmax (mm) | Sens (dB) | Fit | Notes | Compare |
|---|---|---|---|---|---|---|---|---|
| Tannoy 3128 | 25 = | 0.195 = | 276 = | 3 = | 96.5 = | close | + | |
| Pioneer A30GU30-55D | 24 -1 | 0.209 +0.01 | 277 +1 | 3.1 +0.1 | 97.9 +1.4 | close | 4 Ω vs 8 Ω: amp load changes | + |
| Audax LFP502 | 24 -1 | 0.208 +0.01 | 267 -9 | 3.5 +0.5 | 95.4 -1.1 | close | + | |
| Audax PR33SM150 | 24 -1 | 0.208 +0.01 | 267 -9 | 3.5 +0.5 | 95.4 -1.1 | close | + | |
| Focal AUDIOM 12V | 25 = | 0.203 +0.01 | 318 +42 | 6 +3 | 97 +0.5 | close | + | |
| Monacor SPH-300TC v1 | 23 -2 | 0.198 = | 315 +39 | 4 +1 | 95.4 -1.1 | close | + | |
| Great Plains Audio 414-8B (16B) | 25.6 +0.6 | 0.22 +0.02 | 263.1 -12.9 | 4 +1 | 95.3 -1.2 | close | + | |
| Audax PR330M0 v2014 | 26 +1 | 0.203 +0.01 | 208 -68 | 4 +1 | 95.6 -0.9 | close | + | |
| Focal AUDIOM 12VX | 23.5 -1.5 | 0.202 +0.01 | 238 -38 | 6 +3 | 94.5 -2 | usable | + | |
| Monacor SPH-300TC | 23 -2 | 0.239 +0.04 | 290 +14 | 4 +1 | 97.3 +0.8 | usable | 4 Ω vs 8 Ω: amp load changes | + |
Compare the closest 3 against the HPD 315A →
Ranked on parameter similarity only (Qts, Fs, Vas, Xmax, sensitivity). Same nominal size required. A hint, not a simulation, model the swap before cutting or buying.
Used in enclosures (0)
No enclosure in the catalog uses this driver yet.