RCF CX 12N251
Thiele-Small parameters
| Nominal size | 12" |
|---|---|
| Impedance | 8 Ω |
| Fs | 60 Hz |
| Qts | 0.266 |
| Qes | 0.28 |
| Qms | 5.4 |
| Vas | 62 L |
| Sd | 530 cm² |
| Xmax | 3.7 mm |
| Re | 5.2 Ω |
| Bl | 17.7 T·m |
| Mms | 44.7 g |
| Pe | 300 W |
| Sensitivity | 100.6 dB |
Alignment hint
| EBP | 214 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 10.2 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 |
|---|---|---|---|---|---|---|---|---|
| RCF 12 CX251 | 60 = | 0.266 = | 62 = | 3.7 = | 100.6 = | close | + | |
| RCF L 12P530 | 56 -4 | 0.269 = | 59 -3 | 3.7 = | 99.8 -0.8 | close | + | |
| RCF L 12L750 | 62 +2 | 0.271 +0.01 | 52 -10 | 3.5 -0.2 | 100.2 -0.4 | close | Xmax 3.5 mm < 3.7 mm: lower excursion-limited SPL | + |
| 18 Sound 12NCX750 | 58 -2 | 0.296 +0.03 | 63 +1 | 4.6 +0.9 | 99.7 -0.9 | close | + | |
| Ciare PW330 | 55 -5 | 0.282 +0.02 | 65 +3 | 3.8 +0.1 | 99.5 -1.1 | close | + | |
| RCF MB 12G300 | 61 +1 | 0.301 +0.03 | 57 -5 | 4.3 +0.6 | 100.1 -0.5 | close | + | |
| Peavey 1205-8 v1993 | 55.6 -4.4 | 0.281 +0.02 | 69 +7 | 4.5 +0.8 | 100 -0.6 | close | + | |
| Electro-Voice DL12BFH | 60 = | 0.307 +0.04 | 55 -7 | 4 +0.3 | 100.3 -0.3 | close | + | |
| JBL 2020 H | 60 = | 0.228 -0.04 | 65 +3 | 4 +0.3 | 101.9 +1.3 | close | + | |
| JBL 2020H | 60 = | 0.228 -0.04 | 65 +3 | 4 +0.3 | 101.9 +1.3 | close | + |
Compare the closest 3 against the CX 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.