Hertz Audio ES 300.5

12" · 4 Ω · 350 W · 86.6 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	35 Hz
Qts	0.66
Qes	0.7
Qms	11.4
Vas	48.5 L
Sd	507 cm²
Xmax	9 mm
Re	3.26 Ω
Bl	12.6 T·m
Mms	155 g
Pe	350 W
Sensitivity	86.6 dB

Alignment hint

EBP	50 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 328.1 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
Ground Zero GZIW 300X	34.9 -0.1	0.69 +0.03	53.6 +5.1	7.5 -1.5	86.6 =	close	Xmax 7.5 mm < 9 mm: lower excursion-limited SPL	+
Powerbass S-12T	34.4 -0.6	0.634 -0.03	45.92 -2.58	6.9 -2.1	85.8 -0.8	close	Xmax 6.9 mm < 9 mm: lower excursion-limited SPL	+
American Bass DX 12	35.6 +0.6	0.6 -0.06	41.5 -7	12 +3	86.2 -0.4	close		+
hertz Hertz Audio ES300.5	35 =	0.66 =	48.5 =	6.8 -2.2	90.8 +4.2	close	Xmax 6.8 mm < 9 mm: lower excursion-limited SPL	+
Alpine SWE-1242	31 -4	0.66 =	61 +12.5	11.7 +2.7	85.9 -0.7	close	250 W vs 350 W: lower power handling	+
Infinity Kappa 123WDSSI 2Ohm	34.2 -0.8	0.778 +0.12	58.6153 +10.12	10.2 +1.2	86.0429 -0.56	usable	2 Ω vs 4 Ω: amp load changes	+
Rockford Fosgate T1D412	29.2 -5.8	0.613 -0.05	55.8 +7.3	10.9 +1.9	85.8 -0.8	usable	8 Ω vs 4 Ω: amp load changes	+
Selenium 12SW3A DVC 2+2	35 =	0.724 +0.06	49 +0.5	6.5 -2.5	89.6 +3	usable	Xmax 6.5 mm < 9 mm: lower excursion-limited SPL	+
Dayton Audio UM12-22 v2017	26.2 -8.8	0.594 -0.07	46.8 -1.7	9.9 +0.9	86.7 +0.1	usable		+
Dayton Audio UMII12-22	31 -4	0.564 -0.1	53 +4.5	10 +1	88.2 +1.6	usable	8 Ω vs 4 Ω: amp load changes	+

Compare the closest 3 against the ES 300.5 →

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.