Great Plains Audio 3156 GPA
Thiele-Small parameters
| Nominal size | 15" |
|---|---|
| Impedance | 8 Ω |
| Fs | 38 Hz |
| Qts | 0.24 |
| Qes | 0.29 |
| Qms | 1.4 |
| Vas | 246.4 L |
| Sd | 825.8 cm² |
| Xmax | 3.8 mm |
| Re | 6.1 Ω |
| Bl | 18.5 T·m |
| Mms | 68.1 g |
| Pe | 250 W |
| Sensitivity | 99.8 dB |
Alignment hint
| EBP | 131 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 32.1 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 |
|---|---|---|---|---|---|---|---|---|
| Altec 3156 | 38 = | 0.24 = | 246.4 = | 3.8 = | 99.8 = | close | + | |
| Audax PR38LEX100VST | 38.7 +0.7 | 0.258 +0.02 | 221.1 -25.3 | 4 +0.2 | 100.1 +0.3 | close | + | |
| BD Design BD15 | 38.9 +0.9 | 0.247 +0.01 | 258.2 +11.8 | 4 +0.2 | 97.3 -2.5 | close | 16 Ω vs 8 Ω: amp load changes | + |
| Beyma 380 MSPA | 36 -2 | 0.246 +0.01 | 242.2 -4.2 | 3.6 -0.2 | 97.8 -2 | close | Xmax 3.6 mm < 3.8 mm: lower excursion-limited SPL | + |
| LaVoce WAF153.02 | 35 -3 | 0.261 +0.02 | 244 -2.4 | 4.6 +0.8 | 99.7 -0.1 | close | + | |
| RCF L 15/544K | 35 -3 | 0.233 -0.01 | 227 -19.4 | 4 +0.2 | 98.9 -0.9 | close | + | |
| JBL E145 | 35 -3 | 0.249 +0.01 | 274.7 +28.3 | 4.1 +0.3 | 100 +0.2 | close | 150 W vs 250 W: lower power handling | + |
| PD 153ERC002 | 38 = | 0.249 +0.01 | 263 +16.6 | 6.8 +3 | 100.9 +1.1 | close | + | |
| Precision Devices 153ERC002 | 38 = | 0.249 +0.01 | 263 +16.6 | 6.8 +3 | 100.9 +1.1 | close | + | |
| Celestion NTR15-3018E v2015 | 34.6 -3.4 | 0.245 +0.01 | 225.7 -20.7 | 5 +1.2 | 99.1 -0.7 | close | + |
Compare the closest 3 against the 3156 GPA →
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.