Great Plains Audio 604-8H-II
Thiele-Small parameters
| Nominal size | 15" |
|---|---|
| Impedance | 8 Ω |
| Fs | 30.9 Hz |
| Qts | 0.262 |
| Qes | 0.27 |
| Qms | 8.49 |
| Vas | 463 L |
| Sd | 825.8 cm² |
| Xmax | 3.8 mm |
| Re | 4.87 Ω |
| Bl | 13.9 T·m |
| Mms | 54.8 g |
| Pe | 100 W |
| Sensitivity | 101.2 dB |
Alignment hint
| EBP | 114 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 73.7 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 |
|---|---|---|---|---|---|---|---|---|
| Iconic Speakers 704-8A | 30.9 = | 0.262 = | 463 = | 5.1 +1.3 | 99.7 -1.5 | close | + | |
| Beyma 15 GI-100 | 33 +2.1 | 0.243 -0.02 | 430 -33 | 4 +0.2 | 101 -0.2 | close | + | |
| Supravox 400 GN-B | 28.5 -2.4 | 0.272 +0.01 | 450 -13 | 5 +1.2 | 98.6 -2.6 | close | + | |
| Crites Speakers CW1526 | 26.3 -4.6 | 0.263 = | 506.3 +43.3 | 7 +3.2 | 101.1 -0.1 | close | 4 Ω vs 8 Ω: amp load changes | + |
| Crites Speakers CW1526C | 26.3 -4.6 | 0.263 = | 506.3 +43.3 | 7 +3.2 | 101.1 -0.1 | close | 4 Ω vs 8 Ω: amp load changes | + |
| Supravox 400 GMF PRO | 32 +1.1 | 0.263 = | 370 -93 | 4.8 +1 | 99.4 -1.8 | close | + | |
| Altec 515-8LF | 27.4 -3.5 | 0.255 -0.01 | 470.1 +7.1 | 5.1 +1.3 | 98.4 -2.8 | close | + | |
| Great Plains Audio 515-8LF GPA | 27.4 -3.5 | 0.255 -0.01 | 470.1 +7.1 | 5.1 +1.3 | 98.4 -2.8 | close | + | |
| Altec 604-8H | 28.1 -2.8 | 0.269 +0.01 | 558.7 +95.7 | 3.8 = | 99.3 -1.9 | close | + | |
| Davis 39RPA15 | 31 +0.1 | 0.27 +0.01 | 340 -123 | 4 +0.2 | 99.3 -1.9 | close | + |
Compare the closest 3 against the 604-8H-II →
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.