JBL GT4-15
Thiele-Small parameters
| Nominal size | 15" |
|---|---|
| Impedance | 4 Ω |
| Fs | 28.4 Hz |
| Qts | 0.442 |
| Qes | 0.47 |
| Qms | 7.35 |
| Vas | 133.1 L |
| Sd | 855 cm² |
| Xmax | 5.8 mm |
| Re | 3.1 Ω |
| Bl | 16.9 T·m |
| Mms | 242.5 g |
| Pe | 250 W |
| Sensitivity | 94.2 dB |
Alignment hint
| EBP | 60 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 85.4 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 |
|---|---|---|---|---|---|---|---|---|
| Alpine SWS-15D2 | 27 -1.4 | 0.437 -0.01 | 107 -26.1 | 7.5 +1.7 | 95.2 +1 | close | 2 Ω vs 4 Ω: amp load changes | + |
| Focal 40V1 | 26.8 -1.6 | 0.459 +0.02 | 165.7 +32.6 | 7.5 +1.7 | 93.8 -0.4 | close | + | |
| hertz Hertz Audio HX380D | 27 -1.4 | 0.402 -0.04 | 130.6 -2.5 | 7 +1.2 | 91.1 -3.1 | close | 8 Ω vs 4 Ω: amp load changes | + |
| Goldwood GW-15PC/4 | 33.3 +4.9 | 0.431 -0.01 | 125.2 -7.9 | 6 +0.2 | 91.6 -2.6 | close | + | |
| JBL 2216Nd | 36 +7.6 | 0.444 = | 140.7 +7.6 | 7.6 +1.8 | 95.1 +0.9 | close | 8 Ω vs 4 Ω: amp load changes | + |
| JBL W15GTI | 25.2 -3.2 | 0.476 +0.03 | 132.2 -0.9 | 10.2 +4.4 | 92.5 -1.7 | close | + | |
| JBL W15GTI MK2 | 25.2 -3.2 | 0.476 +0.03 | 132.2 -0.9 | 10.2 +4.4 | 92.5 -1.7 | close | + | |
| Ciare 15.00SW-4 | 29 +0.6 | 0.407 -0.04 | 113 -20.1 | 11.1 +5.3 | 93.4 -0.8 | close | + | |
| MTX Audio T6154A | 30 +1.6 | 0.55 +0.11 | 132.2 -0.9 | 7.9 +2.1 | 93.5 -0.7 | close | + | |
| MTX Audio T615-22 | 25.7 -2.7 | 0.431 -0.01 | 110 -23.1 | 7.1 +1.3 | 92.1 -2.1 | close | + |
Compare the closest 3 against the GT4-15 →
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.