JBL 122A

12" · 8 Ω · 100 W · 91.9 dB

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	17 Hz
Qts	0.232
Qes	0.24
Qms	7
Vas	339.8 L
Sd	527.1 cm²
Xmax	6.9 mm
Re	5.7 Ω
Bl	16 T·m
Mms	100.5 g
Pe	100 W
Sensitivity	91.9 dB

Alignment hint

EBP	71 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 41 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
Audiotechnology FLEXUNITS 12 D 77 25 10 KAP	19 +2	0.25 +0.02	340 +0.2	8.6 +1.7	91.3 -0.6	close		+
Audiotechnology 12D772510KAP	19 +2	0.257 +0.02	340 +0.2	8.6 +1.7	93.1 +1.2	close		+
Focal 12V 726	19 +2	0.267 +0.04	340 +0.2	9 +2.1	92 +0.1	close		+
JBL 128-H	20 +3	0.241 +0.01	280.3 -59.5	7.9 +1	93 +1.1	usable		+
AER STUDIO BASS	21 +4	0.237 =	360 +20.2	5.2 -1.7	94.3 +2.4	usable	Xmax 5.2 mm < 6.9 mm: lower excursion-limited SPL	+
Siare 31SPCT	18 +1	0.238 +0.01	407 +67.2	4 -2.9	92.3 +0.4	usable	Xmax 4 mm < 6.9 mm: lower excursion-limited SPL	+
Vifa M30W0-49-08	21 +4	0.225 -0.01	400 +60.2	6 -0.9	95.2 +3.3	usable	Xmax 6 mm < 6.9 mm: lower excursion-limited SPL	+
JBL 128-H vp ca1	21.2 +4.2	0.233 =	222.7 -117.1	7.8 +0.9	93.1 +1.2	usable		+
Scan-Speak 32W/8878T11	21 +4	0.261 +0.03	235 -104.8	7.5 +0.6	92.1 +0.2	usable		+
Monacor SPH-315	22 +5	0.235 =	330 -9.8	4.5 -2.4	94.5 +2.6	usable	Xmax 4.5 mm < 6.9 mm: lower excursion-limited SPL	+

Compare the closest 3 against the 122A →

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.