P.Audio 18 S 400
Thiele-Small parameters
| Nominal size | 18" |
|---|---|
| Impedance | 8 Ω |
| Fs | 36 Hz |
| Qts | 0.407 |
| Qes | 0.44 |
| Qms | 5.37 |
| Vas | 256 L |
| Sd | 1134 cm² |
| Xmax | 5 mm |
| Re | 6.2 Ω |
| Bl | 20.9 T·m |
| Mms | 137.6 g |
| Pe | 400 W |
| Sensitivity | 97.4 dB |
Alignment hint
| EBP | 82 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 126.8 L |
EBP 50-100: works in either a sealed or ported 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 |
|---|---|---|---|---|---|---|---|---|
| Beyma 118Nd/W | 36 = | 0.398 -0.01 | 249 -7 | 7 +2 | 97.7 +0.3 | close | + | |
| PHL Audio 7081 | 34 -2 | 0.409 = | 267.6 +11.6 | 7.5 +2.5 | 97.3 -0.1 | close | + | |
| PHL Audio 7090 | 36 = | 0.386 -0.02 | 260 +4 | 8 +3 | 98.2 +0.8 | close | + | |
| Turbosound TS-18SW700/8A | 35 -1 | 0.433 +0.03 | 250 -6 | 7.5 +2.5 | 97.7 +0.3 | close | + | |
| Faital PRO 18HP1010 | 35 -1 | 0.4 -0.01 | 240.1 -15.9 | 9.75 +4.75 | 98 +0.6 | close | + | |
| Beyma 18LEX1000/Nd | 34 -2 | 0.391 -0.02 | 260 +4 | 9.4 +4.4 | 97.8 +0.4 | close | + | |
| PHL Audio 7030 | 34 -2 | 0.378 -0.03 | 260 +4 | 7.8 +2.8 | 97.6 +0.2 | close | + | |
| Mivoc WS 1865 C-4 | 35 -1 | 0.44 +0.03 | 270 +14 | 5 = | 95.7 -1.7 | close | 4 Ω vs 8 Ω: amp load changes · 300 W vs 400 W: lower power handling | + |
| DAS Audio 18LX vp | 32.3 -3.7 | 0.4 -0.01 | 260.7 +4.7 | 6 +1 | 95.8 -1.6 | close | + | |
| Fane SOVEREIGN PRO 18-800 P | 33 -3 | 0.386 -0.02 | 258 +2 | 7.5 +2.5 | 96.4 -1 | close | + |
Compare the closest 3 against the 18 S 400 →
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.