JBL 127H

10" · 8 Ω · 50 W · 91.9 dB

Thiele-Small parameters

Nominal size	10"
Impedance	8 Ω
Fs	25 Hz
Qts	0.433
Qes	0.46
Qms	7.5
Vas	237.9 L
Sd	316.1 cm²
Xmax	4.8 mm
Re	6.6 Ω
Bl	7.3 T·m
Mms	23.9 g
Pe	50 W
Sensitivity	91.9 dB

Alignment hint

EBP	54 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 142.7 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
Aurum Cantus AC250MK2	23 -2	0.423 -0.01	235 -2.9	8 +3.2	90.2 -1.7	close		+
Isophon BS 35-8 vp06	26.8 +1.8	0.479 +0.05	259 +21.1	4.5 -0.3	92 +0.1	close	Xmax 4.5 mm < 4.8 mm: lower excursion-limited SPL	+
Monacor SPH-250KE	23 -2	0.414 -0.02	204 -33.9	4.8 =	90.6 -1.3	close		+
Audax HD24S34KC	24 -1	0.474 +0.04	254 +16.1	4 -0.8	91 -0.9	close	Xmax 4 mm < 4.8 mm: lower excursion-limited SPL	+
Davis 25SCA10WR	24.6 -0.4	0.327 -0.11	237.7 -0.2	5 +0.2	92.2 +0.3	close		+
Ciare HW250	23 -2	0.486 +0.05	275 +37.1	5 +0.2	90.8 -1.1	close		+
Aurum Cantus AC250F1D	23 -2	0.444 +0.01	184 -53.9	8 +3.2	92 +0.1	close	4 Ω vs 8 Ω: amp load changes	+
Dynaudio 30W54	24 -1	0.357 -0.08	257 +19.1	7 +2.2	92.3 +0.4	close		+
Oxygen SPHERE 380	24 -1	0.421 -0.01	293 +55.1	7 +2.2	94.8 +2.9	usable	4 Ω vs 8 Ω: amp load changes	+
Audax HT240M0	28 +3	0.373 -0.06	223.1 -14.8	4.5 -0.3	93.2 +1.3	usable	Xmax 4.5 mm < 4.8 mm: lower excursion-limited SPL	+

Compare the closest 3 against the 127H →

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.