Eminence EJ-1240
Thiele-Small parameters
| Nominal size | 12" |
|---|---|
| Impedance | 8 Ω |
| Fs | 75 Hz |
| Qts | 0.526 |
| Qes | 0.54 |
| Qms | 20.09 |
| Vas | 71.2 L |
| Sd | 519.5 cm² |
| Xmax | 1.2 mm |
| Re | 7 Ω |
| Bl | 12.1 T·m |
| Mms | 23.9 g |
| Pe | 40 W |
| Sensitivity | 100 dB |
Alignment hint
| EBP | 139 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 88.2 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 |
|---|---|---|---|---|---|---|---|---|
| Warehouse Sound REAPER 12 | 77.4 +2.4 | 0.464 -0.06 | 65 -6.2 | 1.3 +0.1 | 100.6 +0.6 | close | 30 W vs 40 W: lower power handling | + |
| Eminence CV 65A | 76 +1 | 0.582 +0.06 | 59 -12.2 | 1.2 = | 99 -1 | close | + | |
| Celestion K12T-200 | 61.8 -13.2 | 0.514 -0.01 | 71.7 +0.5 | 1.5 +0.3 | 98.4 -1.6 | close | + | |
| Celestion VINTAGE 30 | 75 = | 0.531 +0.01 | 60 -11.2 | 2.1 +0.9 | 96.5 -3.5 | close | 16 Ω vs 8 Ω: amp load changes | + |
| Jensen 12 TORNADO CLASSIC 100 | 72 -3 | 0.52 -0.01 | 55.9 -15.3 | 1 -0.2 | 98.5 -1.5 | usable | Xmax 1 mm < 1.2 mm: lower excursion-limited SPL | + |
| Beyma 12GU | 70 -5 | 0.475 -0.05 | 60 -11.2 | 2 +0.8 | 98.3 -1.7 | usable | + | |
| Celestion G12T-75 v2026 | 85 +10 | 0.595 +0.07 | 61 -10.2 | 2 +0.8 | 100.4 +0.4 | usable | + | |
| Eminence CV 75B | 80 +5 | 0.479 -0.05 | 56.2 -15 | 1.2 = | 97.2 -2.8 | usable | 16 Ω vs 8 Ω: amp load changes | + |
| SICA 12 C 2 CP | 63 -12 | 0.509 -0.02 | 70 -1.2 | 4.2 +3 | 98 -2 | usable | + | |
| B&C 320K/C-A | 82 +7 | 0.5 -0.03 | 53 -18.2 | 2 +0.8 | 101 +1 | usable | + |
Compare the closest 3 against the EJ-1240 →
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.