PD PD 123ER
Thiele-Small parameters
| Nominal size | 12" |
|---|---|
| Impedance | 8 Ω |
| Fs | 60.5 Hz |
| Qts | 0.25 |
| Qes | 0.26 |
| Qms | 6.62 |
| Vas | 51 L |
| Sd | 530 cm² |
| Xmax | 2.5 mm |
| Re | 5.6 Ω |
| Bl | 20.9 T·m |
| Mms | 53.4 g |
| Pe | 400 W |
| Sensitivity | 99.9 dB |
Alignment hint
| EBP | 233 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 7.3 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 123ER | 60.5 = | 0.25 = | 51 = | 2.5 = | 99.9 = | close | + | |
| RCF L 12L750 | 62 +1.5 | 0.271 +0.02 | 52 +1 | 3.5 +1 | 100.2 +0.3 | close | + | |
| Peavey 1201-8 v1993 | 59.7 -0.8 | 0.269 +0.02 | 59 +8 | 2.6 +0.1 | 99.7 -0.2 | close | + | |
| RCF L12L750 | 62 +1.5 | 0.27 +0.02 | 52 +1 | 3.5 +1 | 98.2 -1.7 | close | + | |
| Precision Devices PD123 ER | 60.5 = | 0.247 = | 51 = | 6.5 +4 | 97 -2.9 | close | 16 Ω vs 8 Ω: amp load changes | + |
| RCF 12 CX251 | 60 -0.5 | 0.266 +0.02 | 62 +11 | 3.7 +1.2 | 100.6 +0.7 | close | 300 W vs 400 W: lower power handling | + |
| RCF CX 12N251 | 60 -0.5 | 0.266 +0.02 | 62 +11 | 3.7 +1.2 | 100.6 +0.7 | close | 300 W vs 400 W: lower power handling | + |
| RCF L 12P530 | 56 -4.5 | 0.269 +0.02 | 59 +8 | 3.7 +1.2 | 99.8 -0.1 | close | 300 W vs 400 W: lower power handling | + |
| B&C 12 CLA 76 | 52 -8.5 | 0.247 = | 56 +5 | 3.9 +1.4 | 98.7 -1.2 | close | + | |
| Altec ER-12S | 70 +9.5 | 0.251 = | 56.6 +5.6 | 2.7 +0.2 | 102.6 +2.7 | close | 200 W vs 400 W: lower power handling | + |
Compare the closest 3 against the PD 123ER →
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.