Siare 31SPCS
Thiele-Small parameters
| Nominal size | 12" |
|---|---|
| Impedance | 8 Ω |
| Fs | 22 Hz |
| Qts | 0.494 |
| Qes | 0.6 |
| Qms | 2.8 |
| Vas | 212 L |
| Sd | 452 cm² |
| Xmax | 6 mm |
| Re | 6 Ω |
| Bl | 9.9 T·m |
| Mms | 70.7 g |
| Pe | 120 W |
| Sensitivity | 89 dB |
Alignment hint
| EBP | 37 · sealed |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 202.1 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 R1S4-12 | 22 = | 0.493 = | 197.2 -14.8 | 7 +1 | 91.5 +2.5 | close | 4 Ω vs 8 Ω: amp load changes | + |
| JL Audio 12W1-4 | 22.3 +0.3 | 0.487 -0.01 | 176.214 -35.79 | 7.874 +1.87 | 87.6 -1.4 | close | 4 Ω vs 8 Ω: amp load changes | + |
| JL Audio 12W1-8 | 24 +2 | 0.49 = | 177.29 -34.71 | 7.874 +1.87 | 88.6 -0.4 | close | + | |
| SB Acoustics SB34NRX75-6 vp fx | 22.9 +0.9 | 0.496 = | 181.3 -30.7 | 11 +5 | 90.6 +1.6 | close | + | |
| Peerless SLS315 | 24.4 +2.4 | 0.452 -0.04 | 205.2 -6.8 | 7.8 +1.8 | 91.4 +2.4 | close | + | |
| Peerless 315SWR | 24 +2 | 0.433 -0.06 | 210 -2 | 8 +2 | 91.3 +2.3 | close | + | |
| Peerless XXLS-830845 | 21.5 -0.5 | 0.448 -0.05 | 162.5 -49.5 | 7.6 +1.6 | 88.7 -0.3 | close | + | |
| Peerless 831857 | 24 +2 | 0.433 -0.06 | 210 -2 | 9 +3 | 91.3 +2.3 | usable | + | |
| JBL 2213 | 25 +3 | 0.49 = | 235 +23 | 6.8 +0.8 | 93.1 +4.1 | usable | 50 W vs 120 W: lower power handling | + |
| NHT 1259 | 19 -3 | 0.461 -0.03 | 190 -22 | 12 +6 | 89.4 +0.4 | usable | 4 Ω vs 8 Ω: amp load changes | + |
Compare the closest 3 against the 31SPCS →
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.