RCF MB 12N251
Thiele-Small parameters
| Nominal size | 12" |
|---|---|
| Impedance | 8 Ω |
| Fs | 50 Hz |
| Qts | 0.338 |
| Qes | 0.36 |
| Qms | 5.4 |
| Vas | 83 L |
| Sd | 530 cm² |
| Xmax | 5 mm |
| Re | 5.1 Ω |
| Bl | 14.6 T·m |
| Mms | 48.1 g |
| Pe | 300 W |
| Sensitivity | 98.5 dB |
Alignment hint
| EBP | 139 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 24.6 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 |
|---|---|---|---|---|---|---|---|---|
| 18 Sound 12MB606 | 50 = | 0.323 -0.02 | 84 +1 | 6.4 +1.4 | 98.3 -0.2 | close | + | |
| B&C 12 FCX 76 | 47 -3 | 0.339 = | 82 -1 | 5 = | 97.6 -0.9 | close | + | |
| Monacor SP-12A/302PA | 50 = | 0.335 = | 77 -6 | 5 = | 97.3 -1.2 | close | + | |
| Eminence DELTA PRO 12 A | 51 +1 | 0.353 +0.01 | 81.7 -1.3 | 6.2 +1.2 | 98.1 -0.4 | close | + | |
| Eminence DELTA PRO 12 A vp | 51 +1 | 0.353 +0.01 | 81.7 -1.3 | 6.2 +1.2 | 98.1 -0.4 | close | + | |
| Faital PRO 12PR300 v2015 | 50 = | 0.357 +0.02 | 79.2 -3.8 | 4.9 -0.1 | 98 -0.5 | close | Xmax 4.9 mm < 5 mm: lower excursion-limited SPL | + |
| Eminence DELTA PRO 12A | 51 +1 | 0.35 +0.01 | 81.7 -1.3 | 4.6 -0.4 | 99.2 +0.7 | close | Xmax 4.6 mm < 5 mm: lower excursion-limited SPL | + |
| Eminence KAPPALITE 3012 H0 | 51.5 +1.5 | 0.318 -0.02 | 81.1 -1.9 | 5.8 +0.8 | 98.9 +0.4 | close | + | |
| Faital PRO 12PR300 | 50 = | 0.36 +0.02 | 92.6 +9.6 | 4.92 -0.08 | 99 +0.5 | close | Xmax 4.92 mm < 5 mm: lower excursion-limited SPL | + |
| SICA PL 12 B 3 S | 46.7 -3.3 | 0.356 +0.02 | 79.3 -3.7 | 5.5 +0.5 | 97.1 -1.4 | close | + |
Compare the closest 3 against the MB 12N251 →
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.