B&C 8FMB51
Thiele-Small parameters
| Nominal size | 8" |
|---|---|
| Impedance | 16 Ω |
| Fs | 68 Hz |
| Qts | 0.39 |
| Qes | 0.43 |
| Qms | 4.1 |
| Vas | 20.5 L |
| Sd | 227 cm² |
| Xmax | 5.5 mm |
| Re | 9.8 Ω |
| Bl | 13.73 T·m |
| Mms | 19.7 g |
| Pe | 250 W |
| Sensitivity | 96 dB |
Alignment hint
| EBP | 158 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 9 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 |
|---|---|---|---|---|---|---|---|---|
| B&C 8MBX51 | 68 = | 0.38 -0.01 | 22 +1.5 | 6 +0.5 | 97 +1 | close | + | |
| 18 Sound 8MB400 | 64 -4 | 0.38 -0.01 | 23.9 +3.4 | 5.8 +0.3 | 95 -1 | close | 8 Ω vs 16 Ω: amp load changes | + |
| 18 Sound 8NMB420 | 66 -2 | 0.41 +0.02 | 24.53 +4.03 | 5.8 +0.3 | 95 -1 | close | + | |
| 18 Sound 8MB500 | 74 +6 | 0.43 +0.04 | 21.5 +1 | 6 +0.5 | 95 -1 | close | 8 Ω vs 16 Ω: amp load changes | + |
| 18 Sound 8MB500 | 73 +5 | 0.36 -0.03 | 18.4 -2.1 | 6 +0.5 | 95 -1 | close | 4 Ω vs 16 Ω: amp load changes | + |
| Beyma 8"G40 | 70 +2 | 0.36 -0.03 | 17 -3.5 | 6.5 +1 | 95 -1 | close | 8 Ω vs 16 Ω: amp load changes | + |
| Faital PRO 8FE300 | 70 +2 | 0.44 +0.05 | 15.7 -4.8 | 5.52 +0.02 | 95 -1 | usable | 8 Ω vs 16 Ω: amp load changes | + |
| B&C 8FMB51 | 67 -1 | 0.28 -0.11 | 20.7 +0.2 | 5.5 = | 96.5 +0.5 | usable | 8 Ω vs 16 Ω: amp load changes | + |
| 18 Sound 8MB500 | 73 +5 | 0.5 +0.11 | 21.3 +0.8 | 6 +0.5 | 95 -1 | usable | + | |
| Faital PRO 8PR200 | 58 -10 | 0.37 -0.02 | 16.9 -3.6 | 8.15 +2.65 | 95 -1 | usable | 8 Ω vs 16 Ω: amp load changes | + |
Compare the closest 3 against the 8FMB51 →
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.