hertz Hertz Audio ML5400D
Thiele-Small parameters
| Nominal size | 21.5" |
|---|---|
| Impedance | 2 Ω |
| Fs | 20.7 Hz |
| Qts | 0.303 |
| Qes | 0.32 |
| Qms | 5.73 |
| Vas | 613 L |
| Sd | 1682 cm² |
| Xmax | 8.5 mm |
| Re | 1.1 Ω |
| Bl | 13.1 T·m |
| Mms | 382.5 g |
| Pe | 1000 W |
| Sensitivity | 102.9 dB |
Alignment hint
| EBP | 65 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 137.9 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 21L45 | 25 +4.3 | 0.275 -0.03 | 660 +47 | 9 +0.5 | 98.7 -4.2 | usable | 8 Ω vs 2 Ω: amp load changes | + |
| Pyle Audio PDW21250 | 22.4 +1.7 | 0.331 +0.03 | 703.8 +90.8 | 9 +0.5 | 96.2 -6.7 | usable | 8 Ω vs 2 Ω: amp load changes | + |
| Mach 5 Audio FTW21 | 19.7 -1 | 0.378 +0.08 | 499.9 -113.1 | 7.5 -1 | 95.8 -7.1 | usable | 4 Ω vs 2 Ω: amp load changes · 600 W vs 1000 W: lower power handling · Xmax 7.5 mm < 8.5 mm: lower excursion-limited SPL | + |
| MCM Electronics 55-2985 | 25.9 +5.2 | 0.38 +0.08 | 705 +92 | 6.9 -1.6 | 97.6 -5.3 | usable | 8 Ω vs 2 Ω: amp load changes · 300 W vs 1000 W: lower power handling · Xmax 6.9 mm < 8.5 mm: lower excursion-limited SPL | + |
| PD PD 2150 | 22 +1.3 | 0.193 -0.11 | 628 +15 | 6 -2.5 | 98.9 -4 | usable | 8 Ω vs 2 Ω: amp load changes · 400 W vs 1000 W: lower power handling · Xmax 6 mm < 8.5 mm: lower excursion-limited SPL | + |
| Precision Devices PD 2150 | 22 +1.3 | 0.193 -0.11 | 628 +15 | 6 -2.5 | 98.9 -4 | usable | 8 Ω vs 2 Ω: amp load changes · 400 W vs 1000 W: lower power handling · Xmax 6 mm < 8.5 mm: lower excursion-limited SPL | + |
| Beyma 21LEX1600/Nd | 30 +9.3 | 0.272 -0.03 | 394 -219 | 9.3 +0.8 | 99.3 -3.6 | usable | 8 Ω vs 2 Ω: amp load changes | + |
| RCF LF 21N451 | 30 +9.3 | 0.239 -0.06 | 440 -173 | 8.9 +0.4 | 100.4 -2.5 | usable | 8 Ω vs 2 Ω: amp load changes | + |
| Beyma 21PW1400FE | 30 +9.3 | 0.343 +0.04 | 401.5 -211.5 | 10 +1.5 | 98.6 -4.3 | usable | 8 Ω vs 2 Ω: amp load changes | + |
| CSS Audio Maelstrom 21 DVC by Exodus Audio | 16.3 -4.4 | 0.389 +0.09 | 605 -8 | 16.3 +7.8 | 93 -9.9 | usable | 4 Ω vs 2 Ω: amp load changes | + |
Compare the closest 3 against the ML5400D →
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.