Hertz Audio ES F25.5

10" · 4 Ω · 300 W · 88.7 dB · datasheet ↗

Thiele-Small parameters

Nominal size	10"
Impedance	4 Ω
Fs	39 Hz
Qts	0.44
Qes	0.49
Qms	4.71
Vas	40.2 L
Sd	374 cm²
Xmax	6 mm
Re	2.84 Ω
Bl	10.8 T·m
Mms	82 g
Pe	300 W
Sensitivity	88.7 dB

Alignment hint

EBP	80 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 25.4 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
HSU Research VTF-2 10	38.4 -0.6	0.45 +0.01	38.51 -1.69	8 +2	88.4 -0.3	close	200 W vs 300 W: lower power handling	+
Aurum Cantus AC250SW	35 -4	0.452 +0.01	42 +1.8	5.9 -0.1	90.5 +1.8	close	180 W vs 300 W: lower power handling · Xmax 5.9 mm < 6 mm: lower excursion-limited SPL	+
Aurum Cantus AC250SW vp	35 -4	0.452 +0.01	42 +1.8	5.9 -0.1	90.5 +1.8	close	180 W vs 300 W: lower power handling · Xmax 5.9 mm < 6 mm: lower excursion-limited SPL	+
JBL STAGE 1010	37.1 -1.9	0.427 -0.01	41.5 +1.3	6.1 +0.1	92.1 +3.4	close	225 W vs 300 W: lower power handling	+
Kenwood KFC-W2509	35 -4	0.42 -0.02	44 +3.8	8 +2	88.2 -0.5	close	175 W vs 300 W: lower power handling	+
Brax BRAX MATRIX ML10	35 -4	0.46 +0.02	40 -0.2	12.5 +6.5	87.3 -1.4	close		+
Morel UW 1058	33 -6	0.434 -0.01	40.6 +0.4	8.9 +2.9	86.7 -2	close	8 Ω vs 4 Ω: amp load changes	+
McCauley 6222	40 +1	0.39 -0.05	41.9 +1.7	7 +1	91.5 +2.8	close	8 Ω vs 4 Ω: amp load changes	+
Kenwood KFC-W2502	39.8 +0.8	0.514 +0.07	44.9 +4.7	8.4 +2.4	89 +0.3	close	150 W vs 300 W: lower power handling	+
Sony XS-GSW101	39 =	0.39 -0.05	30.5 -9.7	6.4 +0.4	88.2 -0.5	close		+

Compare the closest 3 against the ES F25.5 →

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.