JBL K120
Thiele-Small parameters
| Nominal size | 12" |
|---|---|
| Impedance | 8 Ω |
| Fs | 50 Hz |
| Qts | 0.2 |
| Qes | 0.21 |
| Qms | 4 |
| Vas | 121.8 L |
| Sd | 530 cm² |
| Xmax | 2.7 mm |
| Re | 6.3 Ω |
| Bl | 17.6 T·m |
| Mms | 32.8 g |
| Pe | 100 W |
| Sensitivity | 101.6 dB |
Alignment hint
| EBP | 238 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 10.6 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 |
|---|---|---|---|---|---|---|---|---|
| Beyma 12M300 | 45 -5 | 0.199 = | 115 -6.8 | 3.8 +1.1 | 100.1 -1.5 | close | + | |
| RCF L 12/584 | 49 -1 | 0.186 -0.01 | 100 -21.8 | 3 +0.3 | 101.6 = | close | + | |
| B&C 12 PE 32 | 51 +1 | 0.185 -0.02 | 101 -20.8 | 2.8 +0.1 | 101.9 +0.3 | close | + | |
| 18 Sound 12MB700 | 49 -1 | 0.19 -0.01 | 101 -20.8 | 4.5 +1.8 | 101.5 -0.1 | close | + | |
| 18 Sound 12MB777 | 49 -1 | 0.19 -0.01 | 101 -20.8 | 4.5 +1.8 | 101.5 -0.1 | close | + | |
| B&C 12 CXN 76 | 42 -8 | 0.195 -0.01 | 120 -1.8 | 4 +1.3 | 100.5 -1.1 | close | + | |
| B&C 12PE32 | 51 +1 | 0.18 -0.02 | 101 -20.8 | 2.8 +0.1 | 101 -0.6 | close | + | |
| B&C 12 HCX 76 | 42 -8 | 0.195 -0.01 | 118.9 -2.9 | 4 +1.3 | 100.5 -1.1 | close | + | |
| Fane STUDIO 12L | 49 -1 | 0.241 +0.04 | 120.9 -0.9 | 4.3 +1.6 | 101.2 -0.4 | close | + | |
| JBL 2130 | 50 = | 0.2 = | 121.8 = | 1.5 -1.2 | 101.6 = | close | Xmax 1.5 mm < 2.7 mm: lower excursion-limited SPL | + |
Compare the closest 3 against the K120 →
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.