Monacor SP-46/500PA
Thiele-Small parameters
| Nominal size | 18" |
|---|---|
| Impedance | 8 Ω |
| Fs | 30 Hz |
| Qts | 0.271 |
| Qes | 0.28 |
| Qms | 8.08 |
| Vas | 333 L |
| Sd | 1180 cm² |
| Xmax | 5 mm |
| Re | 5.7 Ω |
| Bl | 25.2 T·m |
| Mms | 165 g |
| Pe | 500 W |
| Sensitivity | 98.5 dB |
Alignment hint
| EBP | 107 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 57.3 L |
EBP > 100: favours a ported (bass-reflex) 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 |
|---|---|---|---|---|---|---|---|---|
| 18 Sound 18NLW9300 | 30 = | 0.28 +0.01 | 316 -17 | 8 +3 | 98.7 +0.2 | close | + | |
| RCF L 18P400 | 29 -1 | 0.279 +0.01 | 340 +7 | 8.8 +3.8 | 98.5 = | close | + | |
| JBL K151 | 30 = | 0.268 = | 365.3 +32.3 | 4.4 -0.6 | 98.7 +0.2 | close | 150 W vs 500 W: lower power handling · Xmax 4.4 mm < 5 mm: lower excursion-limited SPL | + |
| 18 Sound 18ND9300 | 30 = | 0.28 +0.01 | 322 -11 | 9.5 +4.5 | 98.8 +0.3 | close | + | |
| RCF LF18X400 | 28 -2 | 0.27 = | 340 +7 | 9 +4 | 97.5 -1 | close | + | |
| RCF LF 18X400 v2 | 28 -2 | 0.278 +0.01 | 340 +7 | 9 +4 | 98 -0.5 | close | + | |
| DAS Audio 18G | 32 +2 | 0.296 +0.02 | 343 +10 | 6 +1 | 98.7 +0.2 | close | + | |
| Rockford Fosgate SPP-184 | 27 -3 | 0.266 -0.01 | 353 +20 | 6 +1 | 99.2 +0.7 | close | 4 Ω vs 8 Ω: amp load changes · 350 W vs 500 W: lower power handling | + |
| RCF LF 18G400 | 28 -2 | 0.273 = | 360 +27 | 9 +4 | 98.3 -0.2 | close | + | |
| Celestion FTR18-4080F | 28 -2 | 0.265 -0.01 | 383.3 +50.3 | 6 +1 | 98.6 +0.1 | close | + |
Compare the closest 3 against the SP-46/500PA →
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.