Sony XS-GTX121LB
Thiele-Small parameters
| Nominal size | 12" |
|---|---|
| Impedance | 4 Ω |
| Fs | 27.5 Hz |
| Qts | 0.434 |
| Qes | 0.479 |
| Qms | 4.674 |
| Vas | 58.1 L |
| Sd | 517 cm² |
| Xmax | 4.7 mm |
| Re | 3.43 Ω |
| Bl | 16.3 T·m |
| Mms | 215.9 g |
| Pe | 300 W |
| Sensitivity | 89.7 dB |
Alignment hint
| EBP | 57 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 35.1 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 |
|---|---|---|---|---|---|---|---|---|
| JBL GTO 1214 | 28 +0.5 | 0.469 +0.03 | 58.2 +0.1 | 7.3 +2.6 | 89.4 -0.3 | close | + | |
| Infinity KAPPA 120.9W | 27.2 -0.3 | 0.43 = | 54.4 -3.7 | 6.7 +2 | 87.9 -1.8 | close | 8 Ω vs 4 Ω: amp load changes | + |
| Infinity 120.3SE | 28.4 +0.9 | 0.475 +0.04 | 55.6 -2.5 | 6.8 +2.1 | 89.5 -0.2 | close | + | |
| Oxygen AIR2 300 | 26.7 -0.8 | 0.452 +0.02 | 62.9 +4.8 | 8.8 +4.1 | 89.5 -0.2 | close | + | |
| Alpine SWR-1241D | 28 +0.5 | 0.427 -0.01 | 58 -0.1 | 6.9 +2.2 | 93 +3.3 | close | 2 Ω vs 4 Ω: amp load changes | + |
| Wavecor SW312WA03 | 28 +0.5 | 0.479 +0.04 | 61 +2.9 | 7.3 +2.6 | 90.2 +0.5 | close | + | |
| Monacor CRB-30HQ | 31 +3.5 | 0.424 -0.01 | 55 -3.1 | 5 +0.3 | 91.2 +1.5 | close | + | |
| Fountek FW323 - 4 Ohms | 30 +2.5 | 0.452 +0.02 | 51.4 -6.7 | 6.6 +1.9 | 89.7 = | close | + | |
| Monacor CRB-38HQ | 31 +3.5 | 0.424 -0.01 | 55 -3.1 | 6 +1.3 | 91.2 +1.5 | close | + | |
| Monacor BLACKBASS-12 4 Ohms | 29 +1.5 | 0.482 +0.05 | 61 +2.9 | 7.5 +2.8 | 90.1 +0.4 | close | + |
Compare the closest 3 against the XS-GTX121LB →
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.