Audax PR38SM250

15" · 8 Ω · 250 W · 97.7 dB

Thiele-Small parameters

Nominal size	15"
Impedance	8 Ω
Fs	19.5 Hz
Qts	0.177
Qes	0.18
Qms	9.1
Vas	660 L
Sd	880 cm²
Xmax	4 mm
Re	5.8 Ω
Bl	20.8 T·m
Mms	109.6 g
Pe	250 W
Sensitivity	97.7 dB

Alignment hint

EBP	108 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 44.1 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
Altec 515E	22.9 +3.4	0.185 +0.01	665.5 +5.5	4.6 +0.6	96.5 -1.2	close	16 Ω vs 8 Ω: amp load changes · 75 W vs 250 W: lower power handling	+
JBL 2215H	20 +0.5	0.212 +0.04	736.2 +76.2	4.1 +0.1	97.7 =	close	100 W vs 250 W: lower power handling	+
Electro-Voice DL 15W	21 +1.5	0.164 -0.01	575 -85	5.6 +1.6	98.2 +0.5	close		+
JBL 1501AL-1	19 -0.5	0.191 +0.01	630 -30	6.4 +2.4	94.6 -3.1	close	16 Ω vs 8 Ω: amp load changes · 150 W vs 250 W: lower power handling	+
Tannoy K3838	22 +2.5	0.176 =	481.4 -178.6	4 =	97.9 +0.2	close	120 W vs 250 W: lower power handling	+
Audax PR380M0	20 +0.5	0.22 +0.04	710 +50	3.8 -0.2	97.1 -0.6	close	150 W vs 250 W: lower power handling · Xmax 3.8 mm < 4 mm: lower excursion-limited SPL	+
JBL 2215A	20 +0.5	0.212 +0.04	736.2 +76.2	4.1 +0.1	95.8 -1.9	usable	16 Ω vs 8 Ω: amp load changes · 100 W vs 250 W: lower power handling	+
JBL LE15A	20 +0.5	0.212 +0.04	736.2 +76.2	4.1 +0.1	95.8 -1.9	usable	16 Ω vs 8 Ω: amp load changes · 150 W vs 250 W: lower power handling	+
Tannoy DU 386	22 +2.5	0.185 +0.01	483 -177	4 =	97.6 -0.1	usable	85 W vs 250 W: lower power handling	+
Tannoy HPD 385A	22 +2.5	0.185 +0.01	483 -177	4 =	97.6 -0.1	usable	85 W vs 250 W: lower power handling	+

Compare the closest 3 against the PR38SM250 →

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.