Beyma 18G50
Thiele-Small parameters
| Nominal size | 18" |
|---|---|
| Impedance | 8 Ω |
| Fs | 40 Hz |
| Qts | 0.321 |
| Qes | 0.33 |
| Qms | 12.05 |
| Vas | 212 L |
| Sd | 1320 cm² |
| Xmax | 6 mm |
| Re | 6.1 Ω |
| Bl | 29.1 T·m |
| Mms | 182.4 g |
| Pe | 750 W |
| Sensitivity | 99.3 dB |
Alignment hint
| EBP | 121 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 55 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 |
|---|---|---|---|---|---|---|---|---|
| PD PDN 18SB40 | 38.5 -1.5 | 0.326 +0.01 | 201.3 -10.7 | 6 = | 98.6 -0.7 | close | + | |
| Precision Devices PDN 18SB40 | 38.5 -1.5 | 0.326 +0.01 | 201.3 -10.7 | 6 = | 98.6 -0.7 | close | + | |
| Fane 18-800N | 38 -2 | 0.306 -0.02 | 217 +5 | 7.1 +1.1 | 99.5 +0.2 | close | + | |
| Sica 18 K 4 PL | 36.8 -3.2 | 0.32 = | 201 -11 | 6.5 +0.5 | 97.8 -1.5 | close | + | |
| RCF L 18S800 | 39 -1 | 0.29 -0.03 | 206 -6 | 6.3 +0.3 | 100.2 +0.9 | close | + | |
| RCF L 18S801 | 39 -1 | 0.29 -0.03 | 206 -6 | 6.3 +0.3 | 100.2 +0.9 | close | + | |
| RCF LF 18H400 | 38 -2 | 0.321 = | 250 +38 | 7.4 +1.4 | 100.3 +1 | close | + | |
| RCF W470 | 36 -4 | 0.35 +0.03 | 201 -11 | 6 = | 99.7 +0.4 | close | 4 Ω vs 8 Ω: amp load changes | + |
| Beyma 18G50 vp | 39 -1 | 0.365 +0.04 | 204.9 -7.1 | 6.4 +0.4 | 98.1 -1.2 | close | + | |
| RCF L 18P300 4 Ohms | 34 -6 | 0.305 -0.02 | 213 +1 | 7.8 +1.8 | 99.9 +0.6 | close | 4 Ω vs 8 Ω: amp load changes | + |
Compare the closest 3 against the 18G50 →
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.