Eminence BETA-8A
Thiele-Small parameters
| Nominal size | 8" |
|---|---|
| Impedance | 8 Ω |
| Fs | 65 Hz |
| Qts | 0.38 |
| Qes | 0.42 |
| Qms | 4.95 |
| Vas | 23.3 L |
| Sd | 210 cm² |
| Xmax | 3 mm |
| Re | 5.99 Ω |
| Bl | 9.6 T·m |
| Mms | 16 g |
| Pe | 225 W |
| Sensitivity | 95.1 dB |
Alignment hint
| EBP | 155 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 9.5 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 8MB400 | 64 -1 | 0.38 = | 23.9 +0.6 | 5.8 +2.8 | 95 -0.1 | close | + | |
| 18 Sound 8NMB420 | 66 +1 | 0.41 +0.03 | 24.53 +1.23 | 5.8 +2.8 | 95 -0.1 | close | 16 Ω vs 8 Ω: amp load changes | + |
| B&C 8MBX51 | 68 +3 | 0.38 = | 22 -1.3 | 6 +3 | 97 +1.9 | close | 16 Ω vs 8 Ω: amp load changes | + |
| B&C 8FMB51 | 68 +3 | 0.39 +0.01 | 20.5 -2.8 | 5.5 +2.5 | 96 +0.9 | close | 16 Ω vs 8 Ω: amp load changes | + |
| 18 Sound 8MB500 | 74 +9 | 0.43 +0.05 | 21.5 -1.8 | 6 +3 | 95 -0.1 | usable | + | |
| LaVoce FBASS08-18 | 53 -12 | 0.4 +0.02 | 23.64 +0.34 | 4.5 +1.5 | 92.5 -2.6 | usable | 150 W vs 225 W: lower power handling | + |
| Sica 8 L 2 SL | 64 -1 | 0.32 -0.06 | 18.2 -5.1 | 3.5 +0.5 | 94.5 -0.6 | usable | + | |
| 18 Sound 8MB500 | 73 +8 | 0.36 -0.02 | 18.4 -4.9 | 6 +3 | 95 -0.1 | usable | 4 Ω vs 8 Ω: amp load changes | + |
| Beyma 8"G40 | 70 +5 | 0.36 -0.02 | 17 -6.3 | 6.5 +3.5 | 95 -0.1 | usable | + | |
| Sica 8 D 1.5 CS | 62 -3 | 0.3 -0.08 | 25.5 +2.2 | 2.5 -0.5 | 95.3 +0.2 | usable | 130 W vs 225 W: lower power handling · Xmax 2.5 mm < 3 mm: lower excursion-limited SPL | + |
Compare the closest 3 against the BETA-8A →
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 (1)
- FK Top 8 1Wtopbass reflex