Great Plains Audio 515-8C GPA
Thiele-Small parameters
| Nominal size | 15" |
|---|---|
| Impedance | 8 Ω |
| Fs | 27.8 Hz |
| Qts | 0.299 |
| Qes | 0.31 |
| Qms | 8.25 |
| Vas | 422.5 L |
| Sd | 856 cm² |
| Xmax | 4.7 mm |
| Re | 6.46 Ω |
| Bl | 17 T·m |
| Mms | 79.7 g |
| Pe | 75 W |
| Sensitivity | 97.6 dB |
Alignment hint
| EBP | 90 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 92 L |
EBP 50-100: works in either a sealed or ported 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 |
|---|---|---|---|---|---|---|---|---|
| Davis 40RCA15 vp2 | 26.6 -1.2 | 0.309 +0.01 | 410 -12.5 | 5 +0.3 | 98.6 +1 | close | + | |
| Beyma SM115/N | 29 +1.2 | 0.291 -0.01 | 430 +7.5 | 7.3 +2.6 | 98.3 +0.7 | close | + | |
| Usher Audio 15HM Studio | 27 -0.8 | 0.28 -0.02 | 385 -37.5 | 5.9 +1.2 | 98 +0.4 | close | + | |
| Supravox 400-2000EXC_11V | 25 -2.8 | 0.308 +0.01 | 433 +10.5 | 5 +0.3 | 96.2 -1.4 | close | + | |
| Supravox 400 GN-B | 28.5 +0.7 | 0.272 -0.03 | 450 +27.5 | 5 +0.3 | 98.6 +1 | close | + | |
| Davis 40RCA15 | 27 -0.8 | 0.282 -0.02 | 350 -72.5 | 5 +0.3 | 97.7 +0.1 | close | + | |
| Davis 40RCA15DF | 27 -0.8 | 0.282 -0.02 | 350 -72.5 | 5 +0.3 | 97.7 +0.1 | close | + | |
| Davis 40RCADF | 27 -0.8 | 0.282 -0.02 | 350 -72.5 | 5 +0.3 | 97.7 +0.1 | close | + | |
| Great Plains Audio 604E-II v2012 | 26.2 -1.6 | 0.301 = | 415.2 -7.3 | 3.8 -0.9 | 96.1 -1.5 | close | Xmax 3.8 mm < 4.7 mm: lower excursion-limited SPL | + |
| Usher Audio 15 HM | 28.7 +0.9 | 0.299 = | 314.9 -107.6 | 5.5 +0.8 | 97.6 = | close | + |
Compare the closest 3 against the 515-8C 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.