Precision Devices PD 1850
Thiele-Small parameters
| Nominal size | 18" |
|---|---|
| Impedance | 8 Ω |
| Fs | 30 Hz |
| Qts | 0.212 |
| Qes | 0.22 |
| Qms | 6.04 |
| Vas | 249 L |
| Sd | 1150 cm² |
| Xmax | 6.9 mm |
| Re | 5.4 Ω |
| Bl | 31.1 T·m |
| Mms | 209.5 g |
| Pe | 800 W |
| Sensitivity | 98.5 dB |
Alignment hint
| EBP | 136 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 24.6 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 PD 1850 | 30 = | 0.212 = | 249 = | 6.9 = | 98.5 = | close | + | |
| Precision Devices PD1850 | 30 = | 0.21 = | 249 = | 16 +9.1 | 98 -0.5 | close | + | |
| RCF LF 18N451 | 31 +1 | 0.24 +0.03 | 245 -4 | 8.8 +1.9 | 98.7 +0.2 | close | + | |
| 18 Sound 18NLW9000 | 32 +2 | 0.21 = | 247 -2 | 14 +7.1 | 97 -1.5 | close | 4 Ω vs 8 Ω: amp load changes | + |
| 18 Sound 18NLW9400 | 32 +2 | 0.22 +0.01 | 278 +29 | 9.5 +2.6 | 98 -0.5 | close | 4 Ω vs 8 Ω: amp load changes | + |
| RCF LF18N451 | 31 +1 | 0.24 +0.03 | 245 -4 | 9 +2.1 | 97.5 -1 | close | + | |
| Cerwin-Vega 189E | 30.5 +0.5 | 0.227 +0.02 | 244 -5 | 5.2 -1.7 | 98.6 +0.1 | close | 400 W vs 800 W: lower power handling · Xmax 5.2 mm < 6.9 mm: lower excursion-limited SPL | + |
| B&C 18 NW 100 | 31 +1 | 0.254 +0.04 | 252 +3 | 8.7 +1.8 | 98.4 -0.1 | close | + | |
| PD PD 185C003 | 33 +3 | 0.224 +0.01 | 224 -25 | 8.8 +1.9 | 99.1 +0.6 | close | + | |
| Precision Devices PD 185C003 | 33 +3 | 0.224 +0.01 | 224 -25 | 8.8 +1.9 | 99.1 +0.6 | close | + |
Compare the closest 3 against the PD 1850 →
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.