PD PD 122
Thiele-Small parameters
| Nominal size | 12" |
|---|---|
| Impedance | 8 Ω |
| Fs | 42.9 Hz |
| Qts | 0.196 |
| Qes | 0.2 |
| Qms | 10.81 |
| Vas | 90 L |
| Sd | 550 cm² |
| Xmax | 4.7 mm |
| Re | 5.9 Ω |
| Bl | 22.7 T·m |
| Mms | 64.8 g |
| Pe | 400 W |
| Sensitivity | 98.8 dB |
Alignment hint
| EBP | 214 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 7.5 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 |
|---|---|---|---|---|---|---|---|---|
| Precision Devices PD 122 | 42.9 = | 0.196 = | 90 = | 4.7 = | 98.8 = | close | + | |
| Precision Devices PD122 | 42.9 = | 0.194 = | 90 = | 5.5 +0.8 | 98 -0.8 | close | 16 Ω vs 8 Ω: amp load changes | + |
| Fane COLOSSUS 12BM | 43 +0.1 | 0.211 +0.01 | 89 -1 | 5.3 +0.6 | 98.8 = | close | + | |
| PHL Audio 4130 | 42 -0.9 | 0.208 +0.01 | 92 +2 | 5.2 +0.5 | 98.5 -0.3 | close | + | |
| PHL Audio 4040 | 45 +2.1 | 0.208 +0.01 | 85 -5 | 4.9 +0.2 | 99.1 +0.3 | close | + | |
| RCF LF 12G301 | 43 +0.1 | 0.219 +0.02 | 97 +7 | 5.9 +1.2 | 98.6 -0.2 | close | + | |
| 18 Sound 12MB710 | 46 +3.1 | 0.2 = | 81 -9 | 5 +0.3 | 100 +1.2 | close | + | |
| 18 Sound 12MB720 | 46 +3.1 | 0.2 = | 81 -9 | 5 +0.3 | 100 +1.2 | close | + | |
| 18 Sound 12MB810 | 46 +3.1 | 0.2 = | 81 -9 | 5 +0.3 | 100 +1.2 | close | + | |
| PHL Audio 4090 | 39 -3.9 | 0.19 -0.01 | 92 +2 | 5.1 +0.4 | 100.6 +1.8 | close | 4 Ω vs 8 Ω: amp load changes | + |
Compare the closest 3 against the PD 122 →
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.