Precision Devices PDN 18SB40
Thiele-Small parameters
| Nominal size | 18" |
|---|---|
| Impedance | 8 Ω |
| Fs | 38.5 Hz |
| Qts | 0.326 |
| Qes | 0.336 |
| Qms | 10.52 |
| Vas | 201.3 L |
| Sd | 1134 cm² |
| Xmax | 6 mm |
| Re | 6.02 Ω |
| Bl | 25.7 T·m |
| Mms | 152.9 g |
| Pe | 600 W |
| Sensitivity | 98.6 dB |
Alignment hint
| EBP | 115 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 54.3 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 = | 0.326 = | 201.3 = | 6 = | 98.6 = | close | + | |
| Sica 18 K 4 PL | 36.8 -1.7 | 0.32 -0.01 | 201 -0.3 | 6.5 +0.5 | 97.8 -0.8 | close | + | |
| Beyma 18G50 | 40 +1.5 | 0.321 -0.01 | 212 +10.7 | 6 = | 99.3 +0.7 | close | + | |
| Beyma 18P1200Nd | 37 -1.5 | 0.339 +0.01 | 198 -3.3 | 8.4 +2.4 | 98.3 -0.3 | close | + | |
| Beyma 18G50 vp | 39 +0.5 | 0.365 +0.04 | 204.9 +3.6 | 6.4 +0.4 | 98.1 -0.5 | close | + | |
| RCF W470 | 36 -2.5 | 0.35 +0.02 | 201 -0.3 | 6 = | 99.7 +1.1 | close | 4 Ω vs 8 Ω: amp load changes | + |
| Fane 18-800N | 38 -0.5 | 0.306 -0.02 | 217 +15.7 | 7.1 +1.1 | 99.5 +0.9 | close | + | |
| RCF L 18/851KN | 39 +0.5 | 0.357 +0.03 | 200 -1.3 | 5 -1 | 98.4 -0.2 | close | Xmax 5 mm < 6 mm: lower excursion-limited SPL | + |
| RCF L 18S800 | 39 +0.5 | 0.29 -0.04 | 206 +4.7 | 6.3 +0.3 | 100.2 +1.6 | close | + | |
| RCF L 18S801 | 39 +0.5 | 0.29 -0.04 | 206 +4.7 | 6.3 +0.3 | 100.2 +1.6 | close | + |
Compare the closest 3 against the PDN 18SB40 →
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.