Precision Devices PD 2150
Thiele-Small parameters
| Nominal size | 21.5" |
|---|---|
| Impedance | 8 Ω |
| Fs | 22 Hz |
| Qts | 0.193 |
| Qes | 0.2 |
| Qms | 5.51 |
| Vas | 628 L |
| Sd | 1630 cm² |
| Xmax | 6 mm |
| Re | 5.48 Ω |
| Bl | 34.3 T·m |
| Mms | 310.4 g |
| Pe | 400 W |
| Sensitivity | 98.9 dB |
Alignment hint
| EBP | 110 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 50.6 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 2150 | 22 = | 0.193 = | 628 = | 6 = | 98.9 = | close | + | |
| Beyma 21L45 | 25 +3 | 0.275 +0.08 | 660 +32 | 9 +3 | 98.7 -0.2 | usable | + | |
| hertz Hertz Audio ML5400D | 20.7 -1.3 | 0.303 +0.11 | 613 -15 | 8.5 +2.5 | 102.9 +4 | usable | 2 Ω vs 8 Ω: amp load changes | + |
| Pyle Audio PDW21250 | 22.4 +0.4 | 0.331 +0.14 | 703.8 +75.8 | 9 +3 | 96.2 -2.7 | usable | + | |
| 18 Sound 21LW400 | 28 +6 | 0.234 +0.04 | 385 -243 | 9.3 +3.3 | 99.5 +0.6 | usable | + | |
| RCF LF 21N451 | 30 +8 | 0.239 +0.05 | 440 -188 | 8.9 +2.9 | 100.4 +1.5 | usable | + | |
| RCF LF 21N451 v2017 | 30 +8 | 0.259 +0.07 | 375 -253 | 8.6 +2.6 | 99.3 +0.4 | risky | + | |
| MCM Electronics 55-2985 | 25.9 +3.9 | 0.38 +0.19 | 705 +77 | 6.9 +0.9 | 97.6 -1.3 | risky | 300 W vs 400 W: lower power handling | + |
| Beyma 21LEX1600/Nd | 30 +8 | 0.272 +0.08 | 394 -234 | 9.3 +3.3 | 99.3 +0.4 | risky | + | |
| B&C 21 DS 115 - 4 | 30 +8 | 0.196 = | 274 -354 | 6.9 +0.9 | 103.3 +4.4 | risky | 4 Ω vs 8 Ω: amp load changes | + |
Compare the closest 3 against the PD 2150 →
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.