Precision Devices PDN 2151
Thiele-Small parameters
| Nominal size | 21.5" |
|---|---|
| Impedance | 8 Ω |
| Fs | 31.4 Hz |
| Qts | 0.276 |
| Qes | 0.28 |
| Qms | 18.3 |
| Vas | 303.4 L |
| Sd | 1698.2 cm² |
| Xmax | 6.7 mm |
| Re | 5.35 Ω |
| Bl | 35.9 T·m |
| Mms | 341.5 g |
| Pe | 1000 W |
| Sensitivity | 99 dB |
Alignment hint
| EBP | 112 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 54.5 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 2151 | 31.4 = | 0.276 = | 303.4 = | 6.7 = | 99 = | close | + | |
| Beyma 21QLEX1600/Fe | 30 -1.4 | 0.281 +0.01 | 309 +5.6 | 8.4 +1.7 | 98.1 -0.9 | close | + | |
| B&C 21 SW 150 | 29 -2.4 | 0.261 -0.02 | 254 -49.4 | 7.5 +0.8 | 99.4 +0.4 | close | 4 Ω vs 8 Ω: amp load changes | + |
| Beyma 21LEX1600/Nd | 30 -1.4 | 0.272 = | 394 +90.6 | 9.3 +2.6 | 99.3 +0.3 | close | + | |
| SB Audience NERO-21SW1100D | 32 +0.6 | 0.339 +0.06 | 312.6 +9.2 | 8.1 +1.4 | 98.6 -0.4 | close | + | |
| RCF LF 21N451 v2017 | 30 -1.4 | 0.259 -0.02 | 375 +71.6 | 8.6 +1.9 | 99.3 +0.3 | close | + | |
| B&C 21 DS 115 | 30 -1.4 | 0.234 -0.04 | 269 -34.4 | 7.6 +0.9 | 98.7 -0.3 | close | + | |
| 18 Sound 21NLW9000C | 29 -2.4 | 0.248 -0.03 | 257 -46.4 | 8.1 +1.4 | 100.5 +1.5 | usable | 4 Ω vs 8 Ω: amp load changes | + |
| B&C 21 SW 152 | 32 +0.6 | 0.297 +0.02 | 198.2 -105.2 | 7.5 +0.8 | 98.9 -0.1 | usable | 4 Ω vs 8 Ω: amp load changes | + |
| B&C 21 SW 152 v2013 | 32 +0.6 | 0.297 +0.02 | 200 -103.4 | 7.5 +0.8 | 99.5 +0.5 | usable | 4 Ω vs 8 Ω: amp load changes | + |
Compare the closest 3 against the PDN 2151 →
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.