Beyma 12M300
Thiele-Small parameters
| Nominal size | 12" |
|---|---|
| Impedance | 8 Ω |
| Fs | 45 Hz |
| Qts | 0.199 |
| Qes | 0.204 |
| Qms | 8.49 |
| Vas | 115 L |
| Sd | 530 cm² |
| Xmax | 3.8 mm |
| Re | 6.3 Ω |
| Bl | 19.3 T·m |
| Mms | 42.8 g |
| Pe | 300 W |
| Sensitivity | 100.1 dB |
Alignment hint
| EBP | 221 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 9.9 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 12 HCX 76 | 42 -3 | 0.195 = | 118.9 +3.9 | 4 +0.2 | 100.5 +0.4 | close | + | |
| B&C 12 CXN 76 | 42 -3 | 0.195 = | 120 +5 | 4 +0.2 | 100.5 +0.4 | close | + | |
| 18 Sound 12MB600 | 44 -1 | 0.18 -0.02 | 115 = | 4.5 +0.7 | 101 +0.9 | close | + | |
| B&C 12CXN76 | 42 -3 | 0.19 -0.01 | 120 +5 | 6 +2.2 | 98.3 -1.8 | close | + | |
| 18 Sound 12MB700 | 49 +4 | 0.19 -0.01 | 101 -14 | 4.5 +0.7 | 101.5 +1.4 | close | + | |
| 18 Sound 12MB777 | 49 +4 | 0.19 -0.01 | 101 -14 | 4.5 +0.7 | 101.5 +1.4 | close | + | |
| PD PD 122 | 42.9 -2.1 | 0.196 = | 90 -25 | 4.7 +0.9 | 98.8 -1.3 | close | + | |
| Precision Devices PD 122 | 42.9 -2.1 | 0.196 = | 90 -25 | 4.7 +0.9 | 98.8 -1.3 | close | + | |
| 18 Sound 12MB710 | 46 +1 | 0.2 = | 81 -34 | 5 +1.2 | 100 -0.1 | close | + | |
| 18 Sound 12MB720 | 46 +1 | 0.2 = | 81 -34 | 5 +1.2 | 100 -0.1 | close | + |
Compare the closest 3 against the 12M300 →
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.