Rockford Fosgate R1S4-12
Thiele-Small parameters
| Nominal size | 12" |
|---|---|
| Impedance | 4 Ω |
| Fs | 22 Hz |
| Qts | 0.493 |
| Qes | 0.55 |
| Qms | 4.76 |
| Vas | 197.2 L |
| Sd | 530 cm² |
| Xmax | 7 mm |
| Re | 3.39 Ω |
| Bl | 9.4 T·m |
| Mms | 104.5 g |
| Pe | 200 W |
| Sensitivity | 91.5 dB |
Alignment hint
| EBP | 40 · sealed |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 186.5 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 |
|---|---|---|---|---|---|---|---|---|
| SB Acoustics SB34NRX75-6 vp fx | 22.9 +0.9 | 0.496 = | 181.3 -15.9 | 11 +4 | 90.6 -0.9 | close | 8 Ω vs 4 Ω: amp load changes | + |
| Peerless SLS315 | 24.4 +2.4 | 0.452 -0.04 | 205.2 +8 | 7.8 +0.8 | 91.4 -0.1 | close | 8 Ω vs 4 Ω: amp load changes · 100 W vs 200 W: lower power handling | + |
| Siare 31SPCS | 22 = | 0.494 = | 212 +14.8 | 6 -1 | 89 -2.5 | close | 8 Ω vs 4 Ω: amp load changes · 120 W vs 200 W: lower power handling · Xmax 6 mm < 7 mm: lower excursion-limited SPL | + |
| JL Audio 12W1-4 | 22.3 +0.3 | 0.487 -0.01 | 176.214 -20.99 | 7.874 +0.87 | 87.6 -3.9 | close | 125 W vs 200 W: lower power handling | + |
| Peerless 315SWR | 24 +2 | 0.433 -0.06 | 210 +12.8 | 8 +1 | 91.3 -0.2 | close | 8 Ω vs 4 Ω: amp load changes | + |
| JL Audio 12W1-8 | 24 +2 | 0.49 = | 177.29 -19.91 | 7.874 +0.87 | 88.6 -2.9 | close | 8 Ω vs 4 Ω: amp load changes · 125 W vs 200 W: lower power handling | + |
| Peerless 831857 | 24 +2 | 0.433 -0.06 | 210 +12.8 | 9 +2 | 91.3 -0.2 | close | 8 Ω vs 4 Ω: amp load changes | + |
| JBL 2213 | 25 +3 | 0.49 = | 235 +37.8 | 6.8 -0.2 | 93.1 +1.6 | close | 8 Ω vs 4 Ω: amp load changes · 50 W vs 200 W: lower power handling · Xmax 6.8 mm < 7 mm: lower excursion-limited SPL | + |
| JBL 123A | 25 +3 | 0.49 = | 235 +37.8 | 7.9 +0.9 | 93.1 +1.6 | close | 8 Ω vs 4 Ω: amp load changes · 100 W vs 200 W: lower power handling | + |
| JBL 2213H | 25 +3 | 0.49 = | 235 +37.8 | 7.9 +0.9 | 93.1 +1.6 | close | 8 Ω vs 4 Ω: amp load changes · 75 W vs 200 W: lower power handling | + |
Compare the closest 3 against the R1S4-12 →
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.