18 Sound 18LW1251
Thiele-Small parameters
| Nominal size | 18" |
|---|---|
| Impedance | 8 Ω |
| Fs | 35 Hz |
| Qts | 0.27 |
| Qes | 0.28 |
| Qms | 8 |
| Vas | 268 L |
| Sd | 1134 cm² |
| Xmax | 9 mm |
| Re | 5 Ω |
| Bl | 23.6 T·m |
| Mms | 142 g |
| Pe | 1000 W |
| Sensitivity | 98 dB |
Alignment hint
| EBP | 125 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 45.7 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 18NLW9400 | 33 -2 | 0.26 -0.01 | 268 = | 9.5 +0.5 | 98 = | close | + | |
| 18 Sound 18LW1250 | 35 = | 0.271 = | 268 = | 8.7 -0.3 | 100.2 +2.2 | close | Xmax 8.7 mm < 9 mm: lower excursion-limited SPL | + |
| RCF LF18G401 | 33 -2 | 0.29 +0.02 | 268 = | 9 = | 98 = | close | + | |
| RCF LF18G908 | 33 -2 | 0.29 +0.02 | 268 = | 9 = | 98 = | close | + | |
| B&C 18 TBX 46 | 31 -4 | 0.277 +0.01 | 270 +2 | 9 = | 98.2 +0.2 | close | + | |
| RCF LF18N401 | 32 -3 | 0.26 -0.01 | 257 -11 | 9 = | 98 = | close | + | |
| Oberton 18FBR700 | 35.56 +0.56 | 0.271 = | 231.3 -36.7 | 8 -1 | 98 = | close | 700 W vs 1000 W: lower power handling · Xmax 8 mm < 9 mm: lower excursion-limited SPL | + |
| B&C 18NW100 | 31 -4 | 0.26 -0.01 | 252 -16 | 9 = | 98 = | close | + | |
| RCF LF 18N401 | 32 -3 | 0.259 -0.01 | 257 -11 | 8.8 -0.2 | 98.9 +0.9 | close | Xmax 8.8 mm < 9 mm: lower excursion-limited SPL | + |
| Beyma 18PW1400FE /S | 32 -3 | 0.27 = | 228.9 -39.1 | 10 +1 | 98 = | close | + |
Compare the closest 3 against the 18LW1251 →
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.