Great Plains Audio 604-8H III
Thiele-Small parameters
| Nominal size | 15" |
|---|---|
| Impedance | 8 Ω |
| Fs | 33.7 Hz |
| Qts | 0.254 |
| Qes | 0.26 |
| Qms | 11.8 |
| Vas | 329.9 L |
| Sd | 825.8 cm² |
| Xmax | 3.8 mm |
| Re | 7.14 Ω |
| Bl | 19.4 T·m |
| Mms | 64.6 g |
| Pe | 100 W |
| Sensitivity | 99.3 dB |
Alignment hint
| EBP | 130 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 48.9 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 |
|---|---|---|---|---|---|---|---|---|
| Great Plains Audio 604-H III | 33.7 = | 0.254 = | 329.9 = | 3.8 = | 99.3 = | close | + | |
| Benett 15.200 Z/N | 32.9 -0.8 | 0.265 +0.01 | 344 +14.1 | 5 +1.2 | 100.1 +0.8 | close | + | |
| Altec 921-8A | 34.1 +0.4 | 0.257 = | 299 -30.9 | 5.2 +1.4 | 100.1 +0.8 | close | + | |
| Davis 39RPA15 | 31 -2.7 | 0.27 +0.02 | 340 +10.1 | 4 +0.2 | 99.3 = | close | + | |
| Supravox 400 GMF PRO | 32 -1.7 | 0.263 +0.01 | 370 +40.1 | 4.8 +1 | 99.4 +0.1 | close | + | |
| JBL E145 | 35 +1.3 | 0.249 -0.01 | 274.7 -55.2 | 4.1 +0.3 | 100 +0.7 | close | + | |
| Beyma SM-115 | 35 +1.3 | 0.282 +0.03 | 331 +1.1 | 6.7 +2.9 | 99.7 +0.4 | close | + | |
| Eminence KAPPA 15 C | 31 -2.7 | 0.244 -0.01 | 329.9 = | 5.5 +1.7 | 101.3 +2 | close | 4 Ω vs 8 Ω: amp load changes | + |
| Focal AUDIOM 15B | 31.6 -2.1 | 0.282 +0.03 | 330 +0.1 | 6 +2.2 | 98.8 -0.5 | close | + | |
| Beyma 15GT200 v1990 | 34 +0.3 | 0.236 -0.02 | 276 -53.9 | 5 +1.2 | 99.4 +0.1 | close | + |
Compare the closest 3 against the 604-8H III →
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.