FI Audio IB318-SINGLE2
Thiele-Small parameters
| Nominal size | 18" |
|---|---|
| Impedance | 4 Ω |
| Fs | 22.3 Hz |
| Qts | 0.652 |
| Qes | 0.81 |
| Qms | 3.33 |
| Vas | 381 L |
| Sd | 1210 cm² |
| Xmax | 12.3 mm |
| Re | 3 Ω |
| Bl | 11.9 T·m |
| Mms | 274.4 g |
| Pe | 600 W |
| Sensitivity | 93.4 dB |
Alignment hint
| EBP | 28 · sealed |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 2162.5 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 |
|---|---|---|---|---|---|---|---|---|
| Aura Sound NS18-992-4A | 20 -2.3 | 0.47 -0.18 | 322 -59 | 14.5 +2.2 | 93.2 -0.2 | usable | + | |
| GRS 18PT-8 | 23 +0.7 | 0.547 -0.1 | 467 +86 | 7.8 -4.5 | 92.5 -0.9 | usable | 8 Ω vs 4 Ω: amp load changes · 350 W vs 600 W: lower power handling · Xmax 7.8 mm < 12.3 mm: lower excursion-limited SPL | + |
| Dayton Audio UMII18-22 ULTIMAX II DVC | 22 -0.3 | 0.53 -0.12 | 248.2 -132.8 | 13.8 +1.5 | 90.7 -2.7 | usable | 8 Ω vs 4 Ω: amp load changes | + |
| Zeuz DC181125ip | 22.2 -0.1 | 0.458 -0.19 | 429.3 +48.3 | 8.5 -3.8 | 95 +1.6 | usable | 250 W vs 600 W: lower power handling · Xmax 8.5 mm < 12.3 mm: lower excursion-limited SPL | + |
| AE Speakers IB18HT-4ohm | 18.4 -3.9 | 0.567 -0.09 | 632.1 +251.1 | 16.7 +4.4 | 94.5 +1.1 | usable | + | |
| Magnat AGRESSOR 5000 | 24 +1.7 | 0.431 -0.22 | 324 -57 | 10.6 -1.7 | 95.3 +1.9 | usable | Xmax 10.6 mm < 12.3 mm: lower excursion-limited SPL | + |
| AE Speakers IB18HT-8 | 18.4 -3.9 | 0.568 -0.08 | 632.1 +251.1 | 16.7 +4.4 | 91.5 -1.9 | usable | 8 Ω vs 4 Ω: amp load changes | + |
| BMS 18N862 vp | 24.8 +2.5 | 0.383 -0.27 | 345.6 -35.4 | 16.2 +3.9 | 94.8 +1.4 | usable | 8 Ω vs 4 Ω: amp load changes | + |
| Peerless FSL-1830R09-08 | 32.7 +10.4 | 0.587 -0.07 | 283.1 -97.9 | 9.6 -2.7 | 94.6 +1.2 | usable | 8 Ω vs 4 Ω: amp load changes · Xmax 9.6 mm < 12.3 mm: lower excursion-limited SPL | + |
| SB Audience BIANCO-18SW500 | 30 +7.7 | 0.516 -0.14 | 335 -46 | 9.2 -3.1 | 95.8 +2.4 | usable | 8 Ω vs 4 Ω: amp load changes · Xmax 9.2 mm < 12.3 mm: lower excursion-limited SPL | + |
Compare the closest 3 against the IB318-SINGLE2 →
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.