Audax LFP504
Thiele-Small parameters
| Nominal size | 15" |
|---|---|
| Impedance | 8 Ω |
| Fs | 36 Hz |
| Qts | 0.282 |
| Qes | 0.3 |
| Qms | 4.7 |
| Vas | 193 L |
| Sd | 880 cm² |
| Xmax | 5.5 mm |
| Re | 5.8 Ω |
| Bl | 21.9 T·m |
| Mms | 109.9 g |
| Pe | 350 W |
| Sensitivity | 98.2 dB |
Alignment hint
| EBP | 120 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 36.5 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 |
|---|---|---|---|---|---|---|---|---|
| Audax PR38ST350 | 36 = | 0.28 = | 193 = | 5.5 = | 98.3 +0.1 | close | + | |
| Audax PR38XT350 | 36 = | 0.28 = | 193 = | 5.5 = | 98.3 +0.1 | close | + | |
| DAS Audio 15H | 35 -1 | 0.287 +0.01 | 203 +10 | 6 +0.5 | 97.8 -0.4 | close | + | |
| PHL Audio 5102 | 36 = | 0.306 +0.02 | 190 -3 | 6.1 +0.6 | 97.8 -0.4 | close | + | |
| Davis 40XXXL | 35.6 -0.4 | 0.287 +0.01 | 211.1 +18.1 | 5.5 = | 99.2 +1 | close | 250 W vs 350 W: lower power handling | + |
| Precision Devices PD.153C01 | 39 +3 | 0.27 -0.01 | 195 +2 | 5.7 +0.2 | 98.1 -0.1 | close | + | |
| PHL Audio 5012MNdU | 36 = | 0.268 -0.01 | 175 -18 | 6 +0.5 | 98.3 +0.1 | close | + | |
| PHL Audio 5011 | 36 = | 0.268 -0.01 | 174.7 -18.3 | 6 +0.5 | 98.3 +0.1 | close | + | |
| LaVoce WAF154.03 | 38 +2 | 0.29 +0.01 | 188 -5 | 5.2 -0.3 | 98.6 +0.4 | close | Xmax 5.2 mm < 5.5 mm: lower excursion-limited SPL | + |
| DAS Audio 15S | 35 -1 | 0.287 +0.01 | 188 -5 | 8 +2.5 | 97.4 -0.8 | close | + |
Compare the closest 3 against the LFP504 →
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.