Sphynx SP-31-S
Thiele-Small parameters
| Nominal size | 12" |
|---|---|
| Impedance | 8 Ω |
| Fs | 41 Hz |
| Qts | 1.255 |
| Qes | 1.63 |
| Qms | 5.46 |
| Vas | 101 L |
| Sd | 529.5 cm² |
| Xmax | 3.8 mm |
| Re | 7.09 Ω |
| Bl | 8.1 T·m |
| Mms | 58.6 g |
| Pe | 150 W |
| Sensitivity | 88.8 dB |
Alignment hint
| EBP | 25 · sealed |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | Qts too high |
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 |
|---|---|---|---|---|---|---|---|---|
| JB Systems SP12/200 vp | 42.9 +1.9 | 1.385 +0.13 | 107.3 +6.3 | 3 -0.8 | 89.5 +0.7 | close | Xmax 3 mm < 3.8 mm: lower excursion-limited SPL | + |
| Lautsprecher Technik MHB-12 | 38.2 -2.8 | 1.107 -0.15 | 132.7 +31.7 | 5 +1.2 | 88.9 +0.1 | usable | + | |
| Goldwood GW-212/8 | 38.8 -2.2 | 1.439 +0.18 | 101.7 +0.7 | 2.5 -1.3 | 87.3 -1.5 | usable | Xmax 2.5 mm < 3.8 mm: lower excursion-limited SPL | + |
| Elokance 12WF500 | 50 +9 | 1.102 -0.15 | 99.1 -1.9 | 3.6 -0.2 | 93.2 +4.4 | usable | Xmax 3.6 mm < 3.8 mm: lower excursion-limited SPL | + |
| Goldwood 212/8 | 38 -3 | 1.44 +0.19 | 101.6 +0.6 | 2.5 -1.3 | 86.3 -2.5 | usable | Xmax 2.5 mm < 3.8 mm: lower excursion-limited SPL | + |
| Goldwood GW‐212/4 | 35.8 -5.2 | 1.204 -0.05 | 166.6 +65.6 | 3.5 -0.3 | 88.9 +0.1 | usable | 4 Ω vs 8 Ω: amp load changes · Xmax 3.5 mm < 3.8 mm: lower excursion-limited SPL | + |
| Pioneer PAX30G vp2 | 42.1 +1.1 | 0.879 -0.38 | 92.7 -8.3 | 3 -0.8 | 88.2 -0.6 | usable | 16 Ω vs 8 Ω: amp load changes · 60 W vs 150 W: lower power handling · Xmax 3 mm < 3.8 mm: lower excursion-limited SPL | + |
| GRS 12SW-4 | 29.6 -11.4 | 0.991 -0.26 | 90 -11 | 4.5 +0.7 | 88.1 -0.7 | usable | 4 Ω vs 8 Ω: amp load changes | + |
| Goldwood GW-1248 | 33.3 -7.7 | 0.933 -0.32 | 103.6 +2.6 | 3 -0.8 | 87.2 -1.6 | usable | Xmax 3 mm < 3.8 mm: lower excursion-limited SPL | + |
| GRS 12PF-8 | 35 -6 | 1.543 +0.29 | 149.5 +48.5 | 3.5 -0.3 | 87.1 -1.7 | usable | 100 W vs 150 W: lower power handling · Xmax 3.5 mm < 3.8 mm: lower excursion-limited SPL | + |
Compare the closest 3 against the SP-31-S →
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.