JB Systems WHAREFEDALE B-15-250

15" · 8 Ω · 250 W · 98.7 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	8 Ω
Fs	49.1 Hz
Qts	0.409
Qes	0.46
Qms	3.7
Vas	125 L
Sd	860 cm²
Xmax	4 mm
Re	5.5 Ω
Bl	17.9 T·m
Mms	87.1 g
Pe	250 W
Sensitivity	98.7 dB

Alignment hint

EBP	107 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 62.8 L

EBP > 100: favours a ported (bass-reflex) 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
LaVoce SSF153.00-8	47 -2.1	0.406 =	117 -8	5.1 +1.1	98.4 -0.3	close		+
Eminence 15-3008PS LF	46.6 -2.5	0.396 -0.01	130 +5	5.5 +1.5	98.4 -0.3	close		+
Celestion TN1530	47.6 -1.5	0.39 -0.02	117 -8	3.8 -0.2	98.4 -0.3	close	Xmax 3.8 mm < 4 mm: lower excursion-limited SPL	+
LaVoce WXF15.350-8	50 +0.9	0.38 -0.03	118 -7	4.6 +0.6	99.3 +0.6	close		+
Audax PR38EX100VST	47.7 -1.4	0.372 -0.04	117.9 -7.1	3.9 -0.1	98.6 -0.1	close	Xmax 3.9 mm < 4 mm: lower excursion-limited SPL	+
LaVoce WXF15.400	50 +0.9	0.38 -0.03	118 -7	4.9 +0.9	99.3 +0.6	close		+
JBL 2226HPL vp prodance	49 -0.1	0.396 -0.01	140.1 +15.1	5.8 +1.8	99.2 +0.5	close		+
P.Audio 15BM-300B	50.6 +1.5	0.404 =	113 -12	3.5 -0.5	99.1 +0.4	close	Xmax 3.5 mm < 4 mm: lower excursion-limited SPL	+
Ciare 15.00 W2	44.2 -4.9	0.413 =	127 +2	5 +1	97.3 -1.4	close		+
Focal 15PR75-250	50.8 +1.7	0.369 -0.04	128.8 +3.8	4 =	99.7 +1	close		+

Compare the closest 3 against the WHAREFEDALE B-15-250 →

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)

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