Eminence W1238R

12" · 8 Ω · 150 W · 93.6 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	21.5 Hz
Qts	0.252
Qes	0.262
Qms	6.599
Vas	236.6 L
Sd	533 cm²
Xmax	8.2 mm
Re	4.9 Ω
Bl	15.3 T·m
Mms	92.4 g
Pe	150 W
Sensitivity	93.6 dB

Alignment hint

EBP	82 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 34.4 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
Scan-Speak 32W/8878T11	21 -0.5	0.261 +0.01	235 -1.6	7.5 -0.7	92.1 -1.5	close	Xmax 7.5 mm < 8.2 mm: lower excursion-limited SPL	+
JBL 128-H vp ca2	21.6 +0.1	0.24 -0.01	214.6 -22	7.7 -0.5	93.1 -0.5	close	Xmax 7.7 mm < 8.2 mm: lower excursion-limited SPL	+
JBL 128-H vp ca1	21.2 -0.3	0.233 -0.02	222.7 -13.9	7.8 -0.4	93.1 -0.5	close	Xmax 7.8 mm < 8.2 mm: lower excursion-limited SPL	+
JBL 2214H	23 +1.5	0.244 -0.01	223.7 -12.9	6.6 -1.6	93.9 +0.3	close	Xmax 6.6 mm < 8.2 mm: lower excursion-limited SPL	+
JBL 128-H	20 -1.5	0.241 -0.01	280.3 +43.7	7.9 -0.3	93 -0.6	close	Xmax 7.9 mm < 8.2 mm: lower excursion-limited SPL	+
SB Acoustics SB34NRXL75-8	22 +0.5	0.275 +0.02	205 -31.6	9.6 +1.4	91.9 -1.7	close		+
ATC SB75-314 SC	23 +1.5	0.25 =	245 +8.4	5 -3.2	93.7 +0.1	close	75 W vs 150 W: lower power handling · Xmax 5 mm < 8.2 mm: lower excursion-limited SPL	+
JBL 252G	23 +1.5	0.25 =	178 -58.6	7 -1.2	93.8 +0.2	close	Xmax 7 mm < 8.2 mm: lower excursion-limited SPL	+
Infinity TWEELVE vp	22 +0.5	0.242 -0.01	158 -78.6	10 +1.8	93.3 -0.3	usable		+
Audiotechnology FLEXUNIT 12B772510	25 +3.5	0.299 +0.05	250 +13.4	8.6 +0.4	94.3 +0.7	usable		+

Compare the closest 3 against the W1238R →

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.