Audax HD35S66

15" · 8 Ω · 120 W · 96.4 dB

Thiele-Small parameters

Nominal size	15"
Impedance	8 Ω
Fs	18 Hz
Qts	0.217
Qes	0.23
Qms	4
Vas	735 L
Sd	687 cm²
Xmax	5 mm
Re	5.4 Ω
Bl	13.7 T·m
Mms	70.4 g
Pe	120 W
Sensitivity	96.4 dB

Alignment hint

EBP	78 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 76.4 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
Focal AUDIOM 15VX v2	18.4 +0.4	0.224 +0.01	727 -8	6 +1	96.1 -0.3	close		+
Focal AUDIOM 15VX v3	17.5 -0.5	0.211 -0.01	717.7 -17.3	6 +1	95.1 -1.3	close		+
JBL 136A	16 -2	0.212 -0.01	736.2 +1.2	5.1 +0.1	94.4 -2	close		+
JBL 2231A	16 -2	0.212 -0.01	736.2 +1.2	5.1 +0.1	94.4 -2	close		+
JBL 2231H	16 -2	0.212 -0.01	736.2 +1.2	5.1 +0.1	94.4 -2	close		+
JBL 2215A	20 +2	0.212 -0.01	736.2 +1.2	4.1 -0.9	95.8 -0.6	close	16 Ω vs 8 Ω: amp load changes · Xmax 4.1 mm < 5 mm: lower excursion-limited SPL	+
JBL LE15A	20 +2	0.212 -0.01	736.2 +1.2	4.1 -0.9	95.8 -0.6	close	16 Ω vs 8 Ω: amp load changes · Xmax 4.1 mm < 5 mm: lower excursion-limited SPL	+
JBL 2215H	20 +2	0.212 -0.01	736.2 +1.2	4.1 -0.9	97.7 +1.3	close	Xmax 4.1 mm < 5 mm: lower excursion-limited SPL	+
Audax PR380M0	20 +2	0.22 =	710 -25	3.8 -1.2	97.1 +0.7	close	Xmax 3.8 mm < 5 mm: lower excursion-limited SPL	+
Audiotechnology FLEXUNIT 15E1022510	18 =	0.222 +0.01	600 -135	8.6 +3.6	94.5 -1.9	close		+

Compare the closest 3 against the HD35S66 →

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.