JL Audio 12IB4

12" · 8 Ω · 125 W · 93.6 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	40.5 Hz
Qts	0.631
Qes	0.67
Qms	10.97
Vas	112.4 L
Sd	506 cm²
Xmax	6 mm
Re	6.07 Ω
Bl	10.7 T·m
Mms	49.3 g
Pe	125 W
Sensitivity	93.6 dB

Alignment hint

EBP	60 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 439.5 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
SB Audience BIANCO-120B150	44 +3.5	0.623 -0.01	103.8 -8.6	6.8 +0.8	93.5 -0.1	close		+
AE Speakers LO12-D16	41.9 +1.4	0.67 +0.04	119.7 +7.3	7.4 +1.4	94.1 +0.5	close		+
Focal W31B	40 -0.5	0.58 -0.05	125 +12.6	6 =	95.8 +2.2	close		+
Pioneer TS-W302F	33.4 -7.1	0.6 -0.03	105.6 -6.8	6 =	94.3 +0.7	close	4 Ω vs 8 Ω: amp load changes	+
AE Speakers LO12-D8 v2016	41.9 +1.4	0.67 +0.04	117.9 +5.5	7.4 +1.4	97.1 +3.5	close	4 Ω vs 8 Ω: amp load changes	+
Focal 33F	36.5 -4	0.712 +0.08	95.5 -16.9	6 =	94.1 +0.5	close	4 Ω vs 8 Ω: amp load changes	+
Focal 13V 7501	36.5 -4	0.712 +0.08	97.3 -15.1	6.8 +0.8	94.2 +0.6	close	4 Ω vs 8 Ω: amp load changes	+
Visaton WS32AW vp de FREDO51	39 -1.5	0.765 +0.13	115 +2.6	5 -1	91.5 -2.1	usable	Xmax 5 mm < 6 mm: lower excursion-limited SPL	+
Focal 33H	29.4 -11.1	0.618 -0.01	124.4 +12	7.5 +1.5	92.5 -1.1	usable	4 Ω vs 8 Ω: amp load changes	+
Conrad CPA 15-300	43 +2.5	0.559 -0.07	100.5 -11.9	4 -2	93.8 +0.2	usable	Xmax 4 mm < 6 mm: lower excursion-limited SPL	+

Compare the closest 3 against the 12IB4 →

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.