BMS 18S450
Thiele-Small parameters
| Nominal size | 18" |
|---|---|
| Impedance | 8 Ω |
| Fs | 29 Hz |
| Qts | 0.31 |
| Qes | 0.32 |
| Qms | 7.25 |
| Vas | 281 L |
| Sd | 1213 cm² |
| Xmax | 12 mm |
| Re | 5.5 Ω |
| Bl | 26.5 T·m |
| Mms | 224 g |
| Pe | 1200 W |
| Sensitivity | 95 dB |
Alignment hint
| EBP | 91 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 66.9 L |
EBP 50-100: works in either a sealed or ported 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 |
|---|---|---|---|---|---|---|---|---|
| Lavoce SAF184.03 | 30 +1 | 0.32 +0.01 | 260 -21 | 13 +1 | 94.9 -0.1 | close | + | |
| RCF LF18X401 | 30 +1 | 0.3 -0.01 | 274 -7 | 12 = | 97.5 +2.5 | close | + | |
| RCF LF18Y402 | 30 +1 | 0.3 -0.01 | 274 -7 | 12 = | 97.5 +2.5 | close | + | |
| BMS 18N850vv2 | 29.8 +0.8 | 0.33 +0.02 | 243 -38 | 12 = | 95 = | close | + | |
| RCF LF 18X401 | 30 +1 | 0.298 -0.01 | 274 -7 | 11.4 -0.6 | 97.5 +2.5 | close | Xmax 11.4 mm < 12 mm: lower excursion-limited SPL | + |
| BMS 18N840V2 | 28.5 -0.5 | 0.314 = | 288 +7 | 10 -2 | 97.1 +2.1 | close | Xmax 10 mm < 12 mm: lower excursion-limited SPL | + |
| B&C 18TBX100 | 30 +1 | 0.31 = | 256 -25 | 9 -3 | 94 -1 | close | 4 Ω vs 8 Ω: amp load changes · Xmax 9 mm < 12 mm: lower excursion-limited SPL | + |
| RCF LF18N405 | 30 +1 | 0.32 +0.01 | 227 -54 | 14 +2 | 97 +2 | close | + | |
| RCF LF 18N405 | 30 +1 | 0.324 +0.01 | 227 -54 | 10.8 -1.2 | 96.7 +1.7 | close | Xmax 10.8 mm < 12 mm: lower excursion-limited SPL | + |
| BMS 18N862 | 25.1 -3.9 | 0.34 +0.03 | 312 +31 | 19 +7 | 95 = | close | + |
Compare the closest 3 against the 18S450 →
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.