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hertz Hertz Audio ML5400D

21.5" · 2 Ω · 1000 W · 102.9 dB · datasheet ↗

Thiele-Small parameters

Nominal size21.5"
Impedance2 Ω
Fs20.7 Hz
Qts0.303
Qes0.32
Qms5.73
Vas613 L
Sd1682 cm²
Xmax8.5 mm
Re1.1 Ω
Bl13.1 T·m
Mms382.5 g
Pe1000 W
Sensitivity102.9 dB

Alignment hint

EBP65 · 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

DriverFs (Hz)QtsVas (L)Xmax (mm)Sens (dB)FitNotesCompare
Beyma 21L4525 +4.30.275 -0.03660 +479 +0.598.7 -4.2usable8 Ω vs 2 Ω: amp load changes+
Pyle Audio PDW2125022.4 +1.70.331 +0.03703.8 +90.89 +0.596.2 -6.7usable8 Ω vs 2 Ω: amp load changes+
Mach 5 Audio FTW2119.7 -10.378 +0.08499.9 -113.17.5 -195.8 -7.1usable4 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 55-298525.9 +5.20.38 +0.08705 +926.9 -1.697.6 -5.3usable8 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 215022 +1.30.193 -0.11628 +156 -2.598.9 -4usable8 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 215022 +1.30.193 -0.11628 +156 -2.598.9 -4usable8 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/Nd30 +9.30.272 -0.03394 -2199.3 +0.899.3 -3.6usable8 Ω vs 2 Ω: amp load changes+
RCF LF 21N45130 +9.30.239 -0.06440 -1738.9 +0.4100.4 -2.5usable8 Ω vs 2 Ω: amp load changes+
Beyma 21PW1400FE30 +9.30.343 +0.04401.5 -211.510 +1.598.6 -4.3usable8 Ω vs 2 Ω: amp load changes+
CSS Audio Maelstrom 21 DVC by Exodus Audio16.3 -4.40.389 +0.09605 -816.3 +7.893 -9.9usable4 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.