Rockford Fosgate P112S4
Thiele-Small parameters
| Nominal size | 12" |
|---|---|
| Impedance | 4 Ω |
| Fs | 25 Hz |
| Qts | 0.52 |
| Qes | 0.56 |
| Qms | 7.31 |
| Vas | 110 L |
| Sd | 541.9 cm² |
| Xmax | 7.3 mm |
| Re | 3.4 Ω |
| Bl | 12 T·m |
| Mms | 151.7 g |
| Pe | 150 W |
| Sensitivity | 90.6 dB |
Alignment hint
| EBP | 45 · sealed |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 129.5 L |
EBP < 50: favours a sealed (closed) 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 |
|---|---|---|---|---|---|---|---|---|
| Rockford Fosgate P1S412 | 25 = | 0.537 +0.02 | 109 -1 | 9 +1.7 | 90.4 -0.2 | close | + | |
| Peerless XXLS-P830845 | 27 +2 | 0.517 = | 119.5 +9.5 | 7.6 +0.3 | 89.8 -0.8 | close | 8 Ω vs 4 Ω: amp load changes | + |
| Ground Zero GZTW 30 | 25 = | 0.44 -0.08 | 110 = | 11.2 +3.9 | 90.7 +0.1 | close | + | |
| Ground Zero GZTW 30T | 25 = | 0.443 -0.08 | 110 = | 11.9 +4.6 | 90.7 +0.1 | close | + | |
| Focal 33S | 25.9 +0.9 | 0.464 -0.06 | 107.9 -2.1 | 7.5 +0.2 | 92.8 +2.2 | close | + | |
| JBL GT3-12 | 28.2 +3.2 | 0.541 +0.02 | 100.5 -9.5 | 8.2 +0.9 | 91.8 +1.2 | close | + | |
| HiVi D10G | 26 +1 | 0.465 -0.05 | 117.3 +7.3 | 8.3 +1 | 89 -1.6 | close | 8 Ω vs 4 Ω: amp load changes | + |
| JL Audio 12WX-4 | 27 +2 | 0.562 +0.04 | 94.5 -15.5 | 8.5 +1.2 | 90.5 -0.1 | close | + | |
| Sony XS-L121P5S | 22.6 -2.4 | 0.51 -0.01 | 102.1 -7.9 | 11.5 +4.2 | 89 -1.6 | close | + | |
| Thiel TSW 12.1 vp | 20 -5 | 0.505 -0.02 | 112 +2 | 8.6 +1.3 | 89.9 -0.7 | close | + |
Compare the closest 3 against the P112S4 →
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.