the box Speaker 18-500/8-A
Thiele-Small parameters
| Nominal size | 18" |
|---|---|
| Impedance | 8 Ω |
| Fs | 40.1 Hz |
| Qts | 0.425 |
| Qes | 0.45 |
| Qms | 7.61 |
| Vas | 208.3 L |
| Sd | 1313 cm² |
| Xmax | 5.4 mm |
| Re | 5.5 Ω |
| Bl | 23.7 T·m |
| Mms | 182.8 g |
| Pe | 500 W |
| Sensitivity | 98.4 dB |
Alignment hint
| EBP | 89 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 117.8 L |
EBP 50-100: works in either a sealed or ported 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 |
|---|---|---|---|---|---|---|---|---|
| Elder Audio 18LB100-8A | 40 -0.1 | 0.425 = | 208 -0.3 | 6.4 +1 | 98.3 -0.1 | close | + | |
| Beyma 18P1000Nd | 40 -0.1 | 0.412 -0.01 | 178 -30.3 | 7.6 +2.2 | 98.2 -0.2 | close | + | |
| RCF LF 18P400 | 39.5 -0.6 | 0.391 -0.03 | 201 -7.3 | 8 +2.6 | 99 +0.6 | close | + | |
| P.Audio BM-18LF | 39.8 -0.3 | 0.432 +0.01 | 169.9 -38.4 | 5.8 +0.4 | 97.7 -0.7 | close | + | |
| Beyma 18GT400 | 40 -0.1 | 0.383 -0.04 | 185 -23.3 | 5.3 -0.1 | 98.3 -0.1 | close | Xmax 5.3 mm < 5.4 mm: lower excursion-limited SPL | + |
| DAS Audio 18LXN | 38.5 -1.6 | 0.45 +0.03 | 213.7 +5.4 | 8 +2.6 | 97.2 -1.2 | close | + | |
| Faital PRO 18HP1042 | 38 -2.1 | 0.41 -0.02 | 191.9 -16.4 | 9 +3.6 | 98 -0.4 | close | + | |
| Beyma 18G50 vp | 39 -1.1 | 0.365 -0.06 | 204.9 -3.4 | 6.4 +1 | 98.1 -0.3 | close | + | |
| Selenium 18SW3P | 37 -3.1 | 0.41 -0.02 | 215 +6.7 | 6.75 +1.35 | 96 -2.4 | close | + | |
| B&C 18 TBX 100 (prodance) | 36.6 -3.5 | 0.406 -0.02 | 198 -10.3 | 9 +3.6 | 97.4 -1 | close | + |
Compare the closest 3 against the Speaker 18-500/8-A →
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.