Kenwood KFC-W2509

10" · 4 Ω · 175 W · 88.2 dB · datasheet ↗

Thiele-Small parameters

Nominal size	10"
Impedance	4 Ω
Fs	35 Hz
Qts	0.42
Qes	0.437
Qms	10.55
Vas	44 L
Sd	363 cm²
Xmax	8 mm
Re	4.03 Ω
Bl	13.2 T·m
Mms	86 g
Pe	175 W
Sensitivity	88.2 dB

Alignment hint

EBP	80 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 24 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 10NMFS	35 =	0.42 =	45 +1	14.5 +6.5	90 +1.8	close	8 Ω vs 4 Ω: amp load changes	+
Morel UW 1058	33 -2	0.434 +0.01	40.6 -3.4	8.9 +0.9	86.7 -1.5	close	8 Ω vs 4 Ω: amp load changes	+
Alpine SWA-10S4	32 -3	0.42 =	41 -3	10 +2	86.6 -1.6	close		+
HSU Research VTF-2 10	38.4 +3.4	0.45 +0.03	38.51 -5.49	8 =	88.4 +0.2	close		+
Brax BRAX MATRIX ML10	35 =	0.46 +0.04	40 -4	12.5 +4.5	87.3 -0.9	close		+
Ground Zero GZIW 250X	30.1 -4.9	0.44 +0.02	43.8 -0.2	7.5 -0.5	85.9 -2.3	close	Xmax 7.5 mm < 8 mm: lower excursion-limited SPL	+
Alpine SWE-1044E	34 -1	0.497 +0.08	49 +5	8.5 +0.5	86.9 -1.3	close		+
Dayton Audio RSS265HF-4 v2012	26.2 -8.8	0.441 +0.02	45 +1	9.4 +1.4	87.8 -0.4	close		+
Aurum Cantus AC250SW	35 =	0.452 +0.03	42 -2	5.9 -2.1	90.5 +2.3	close	Xmax 5.9 mm < 8 mm: lower excursion-limited SPL	+
Aurum Cantus AC250SW vp	35 =	0.452 +0.03	42 -2	5.9 -2.1	90.5 +2.3	close	Xmax 5.9 mm < 8 mm: lower excursion-limited SPL	+

Compare the closest 3 against the KFC-W2509 →

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.