Monacor SPA-45PA
Thiele-Small parameters
| Nominal size | 18" |
|---|---|
| Impedance | 8 Ω |
| Fs | 29 Hz |
| Qts | 0.457 |
| Qes | 0.52 |
| Qms | 3.77 |
| Vas | 440 L |
| Sd | 1225 cm² |
| Xmax | 4 mm |
| Re | 5.8 Ω |
| Bl | 17.1 T·m |
| Mms | 144 g |
| Pe | 300 W |
| Sensitivity | 96.5 dB |
Alignment hint
| EBP | 56 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 315.6 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 |
|---|---|---|---|---|---|---|---|---|
| Beyma SM118 | 30 +1 | 0.421 -0.04 | 430 -10 | 5.5 +1.5 | 97.2 +0.7 | close | + | |
| Eminence KAPPA 18 A | 28 -1 | 0.408 -0.05 | 475.5 +35.5 | 4.8 +0.8 | 95.9 -0.6 | close | + | |
| Mach 5 Audio MAC MAH CWA46 | 27 -2 | 0.448 -0.01 | 470.3 +30.3 | 10 +6 | 96.2 -0.3 | close | + | |
| SB Audience BIANCO-18SW450 v2024 | 28 -1 | 0.445 -0.01 | 370.4 -69.6 | 9.1 +5.1 | 96.4 -0.1 | close | + | |
| Beyma 18LX60 (prodance) | 31.3 +2.3 | 0.472 +0.01 | 385.3 -54.7 | 9 +5 | 96.8 +0.3 | close | + | |
| Beyma 18LX60 vp1 | 31.3 +2.3 | 0.472 +0.01 | 385 -55 | 9 +5 | 96.8 +0.3 | close | + | |
| Selenium 18WS600 | 33 +4 | 0.43 -0.03 | 375 -65 | 3.8 -0.2 | 96.7 +0.2 | close | Xmax 3.8 mm < 4 mm: lower excursion-limited SPL | + |
| Beyma 18WRS600 | 30 +1 | 0.47 +0.01 | 354 -86 | 8.5 +4.5 | 97 +0.5 | close | + | |
| Faital PRO 18FH500 | 30 +1 | 0.53 +0.07 | 450.1 +10.1 | 9.45 +5.45 | 97 +0.5 | close | 16 Ω vs 8 Ω: amp load changes | + |
| Dibeisi PS1805-8 | 27.1 -1.9 | 0.4 -0.06 | 473.8 +33.8 | 7 +3 | 96.1 -0.4 | close | + |
Compare the closest 3 against the SPA-45PA →
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.