18 Sound 8M400F
Thiele-Small parameters
| Nominal size | 8" |
|---|---|
| Impedance | 8 Ω |
| Fs | 89 Hz |
| Qts | 0.26 |
| Qes | 0.28 |
| Qms | 4.03 |
| Vas | 13.7 L |
| Sd | 227 cm² |
| Xmax | 3 mm |
| Re | 5.1 Ω |
| Bl | 13.1 T·m |
| Mms | 16.9 g |
| Pe | 250 W |
| Sensitivity | 100.5 dB |
Alignment hint
| EBP | 318 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 2.1 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 |
|---|---|---|---|---|---|---|---|---|
| Sica 8 N 2.5 PL | 77 -12 | 0.3 +0.04 | 13.7 = | 3.5 +0.5 | 96.4 -4.1 | usable | + | |
| LaVoce MAF082.00-16 | 88 -1 | 0.24 -0.02 | 10.89 -2.81 | 2.3 -0.7 | 98.5 -2 | usable | 16 Ω vs 8 Ω: amp load changes · Xmax 2.3 mm < 3 mm: lower excursion-limited SPL | + |
| Oberton 8NMB250v4 | 82.03 -6.97 | 0.258 = | 10.89 -2.81 | 4.5 +1.5 | 96 -4.5 | usable | + | |
| 18 Sound 8NTLW2000 | 74 -15 | 0.26 = | 11.3 -2.4 | 4.4 +1.4 | 96.5 -4 | usable | 16 Ω vs 8 Ω: amp load changes | + |
| Sica 8 Fe 2.5 CP | 73 -16 | 0.28 +0.02 | 15.6 +1.9 | 4 +1 | 96.7 -3.8 | usable | + | |
| BMS 8N515 | 87.7 -1.3 | 0.3 +0.04 | 11.04 -2.66 | 4 +1 | 96 -4.5 | usable | + | |
| B&C 8NDL64 | 73 -16 | 0.24 -0.02 | 11.8 -1.9 | 4.5 +1.5 | 97 -3.5 | usable | 16 Ω vs 8 Ω: amp load changes | + |
| BMS 8S215 | 87.7 -1.3 | 0.31 +0.05 | 11.04 -2.66 | 4.25 +1.25 | 96 -4.5 | usable | + | |
| B&C 8NDL64 | 80 -9 | 0.25 -0.01 | 9.6 -4.1 | 4.5 +1.5 | 97 -3.5 | usable | + | |
| B&C 8PE21 | 87 -2 | 0.19 -0.07 | 13 -0.7 | 2.5 -0.5 | 98 -2.5 | usable | Xmax 2.5 mm < 3 mm: lower excursion-limited SPL | + |
Compare the closest 3 against the 8M400F →
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.