JBL 128-H vp ca1

12" · 8 Ω · 150 W · 93.1 dB

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	21.2 Hz
Qts	0.233
Qes	0.245
Qms	4.959
Vas	222.7 L
Sd	522 cm²
Xmax	7.8 mm
Re	5.4 Ω
Bl	16.9 T·m
Mms	96.9 g
Pe	150 W
Sensitivity	93.1 dB

Alignment hint

EBP	87 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 27.1 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
JBL 128-H vp ca2	21.6 +0.4	0.24 +0.01	214.6 -8.1	7.7 -0.1	93.1 =	close	Xmax 7.7 mm < 7.8 mm: lower excursion-limited SPL	+
Eminence W1238R	21.5 +0.3	0.252 +0.02	236.6 +13.9	8.2 +0.4	93.6 +0.5	close		+
Scan-Speak 32W/8878T11	21 -0.2	0.261 +0.03	235 +12.3	7.5 -0.3	92.1 -1	close	Xmax 7.5 mm < 7.8 mm: lower excursion-limited SPL	+
JBL 2214H	23 +1.8	0.244 +0.01	223.7 +1	6.6 -1.2	93.9 +0.8	close	Xmax 6.6 mm < 7.8 mm: lower excursion-limited SPL	+
JBL 128-H	20 -1.2	0.241 +0.01	280.3 +57.6	7.9 +0.1	93 -0.1	close		+
SB Acoustics SB34NRXL75-8	22 +0.8	0.275 +0.04	205 -17.7	9.6 +1.8	91.9 -1.2	close		+
Infinity TWEELVE vp	22 +0.8	0.242 +0.01	158 -64.7	10 +2.2	93.3 +0.2	close		+
JBL 252G	23 +1.8	0.25 +0.02	178 -44.7	7 -0.8	93.8 +0.7	usable	Xmax 7 mm < 7.8 mm: lower excursion-limited SPL	+
Infinity BETA12	22 +0.8	0.242 +0.01	158 -64.7	10 +2.2	94.8 +1.7	usable	4 Ω vs 8 Ω: amp load changes	+
TVM ARN 312-00/4	22 +0.8	0.289 +0.06	206 -16.7	6.4 -1.4	93.8 +0.7	usable	4 Ω vs 8 Ω: amp load changes · 100 W vs 150 W: lower power handling · Xmax 6.4 mm < 7.8 mm: lower excursion-limited SPL	+

Compare the closest 3 against the 128-H vp ca1 →

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.