Jamo 20325

12" · 4 Ω · 100 W · 93 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	32 Hz
Qts	0.849
Qes	0.95
Qms	7.95
Vas	163.4 L
Sd	517 cm²
Xmax	5 mm
Re	3.6 Ω
Bl	6.6 T·m
Mms	56.7 g
Pe	100 W
Sensitivity	93 dB

Alignment hint

EBP	34 · sealed
Sealed Vb (Qtc ≈ 0.71)	Qts too high

EBP < 50: favours a sealed (closed) 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
Kenwood RD 30 FU 120-F	31.6 -0.4	0.879 +0.03	206.3 +42.9	8 +3	89.8 -3.2	usable	8 Ω vs 4 Ω: amp load changes	+
Infinity 1200WIB vp	35 +3	0.789 -0.06	116 -47.4	5.1 +0.1	92.8 -0.2	usable		+
Cabasse 30BZ18 v2	38.5 +6.5	0.747 -0.1	154.7 -8.7	4 -1	92.8 -0.2	usable	8 Ω vs 4 Ω: amp load changes · Xmax 4 mm < 5 mm: lower excursion-limited SPL	+
Monacor SP-302C	33 +1	0.607 -0.24	155 -8.4	5 =	94.3 +1.3	usable		+
Sphynx SP-W310PP	33 +1	0.618 -0.23	182.8 +19.4	5 =	91 -2	usable	16 Ω vs 4 Ω: amp load changes	+
STX W.30.200.8.MC	31 -1	0.622 -0.23	148 -15.4	6.2 +1.2	91.3 -1.7	usable	8 Ω vs 4 Ω: amp load changes	+
Kenford HW-1206	31 -1	0.8 -0.05	170 +6.6	3 -2	89.5 -3.5	usable	8 Ω vs 4 Ω: amp load changes · Xmax 3 mm < 5 mm: lower excursion-limited SPL	+
Lanzar VW124/12D	40 +8	0.763 -0.09	147.4 -16	10 +5	95.5 +2.5	usable		+
Samy Speaker LW1200 v1	27.1 -4.9	0.754 -0.09	159.6 -3.8	4.5 -0.5	87 -6	usable	16 Ω vs 4 Ω: amp load changes · Xmax 4.5 mm < 5 mm: lower excursion-limited SPL	+
Visaton WS32AW vp de FREDO51	39 +7	0.765 -0.08	115 -48.4	5 =	91.5 -1.5	usable	8 Ω vs 4 Ω: amp load changes	+

Compare the closest 3 against the 20325 →

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.