Siare 31SPCT vp jmp norm
Thiele-Small parameters
| Nominal size | 12" |
|---|---|
| Impedance | 8 Ω |
| Fs | 19.3 Hz |
| Qts | 0.399 |
| Qes | 0.47 |
| Qms | 2.66 |
| Vas | 254 L |
| Sd | 461 cm² |
| Xmax | 4 mm |
| Re | 6.95 Ω |
| Bl | 12 T·m |
| Mms | 79.8 g |
| Pe | 120 W |
| Sensitivity | 88.5 dB |
Alignment hint
| EBP | 41 · sealed |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 118.7 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 |
|---|---|---|---|---|---|---|---|---|
| RCF L12P48 | 19.5 +0.2 | 0.43 +0.03 | 270 +16 | 5.5 +1.5 | 88.3 -0.2 | close | 75 W vs 120 W: lower power handling | + |
| RCF L 12P48 | 19.5 +0.2 | 0.421 +0.02 | 270 +16 | 5.5 +1.5 | 90.6 +2.1 | close | 75 W vs 120 W: lower power handling | + |
| SB Acoustics SB34NRX75-6 | 19 -0.3 | 0.397 = | 260 +6 | 11 +7 | 91 +2.5 | close | + | |
| Audax 180040A | 22.4 +3.1 | 0.392 -0.01 | 239.6 -14.4 | 8 +4 | 88.7 +0.2 | close | 16 Ω vs 8 Ω: amp load changes | + |
| Max Speaker PV-1230 8 Ohms | 20 +0.7 | 0.452 +0.05 | 317 +63 | 4 = | 90.5 +2 | usable | + | |
| Scan-Speak 32W/8878T01 | 19.1 -0.2 | 0.33 -0.07 | 234 -20 | 7.5 +3.5 | 89.8 +1.3 | usable | + | |
| Davis 31ST12M | 24 +4.7 | 0.399 = | 260 +6 | 8.9 +4.9 | 91.6 +3.1 | usable | + | |
| Davis 31ST12M v2011 | 24 +4.7 | 0.399 = | 260 +6 | 8.9 +4.9 | 91.6 +3.1 | usable | + | |
| Audiotechnology FLEXUNIT 12D775210KAP Custom | 19 -0.3 | 0.388 -0.01 | 340 +86 | 8.6 +4.6 | 91.1 +2.6 | usable | + | |
| Audiotechnology FLEXUNIT 12B775210KAP Custom | 19 -0.3 | 0.382 -0.02 | 340 +86 | 8.6 +4.6 | 91.2 +2.7 | usable | + |
Compare the closest 3 against the 31SPCT vp jmp norm →
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.