Isophon PSL 300/50

12" · 4 Ω · 50 W · 95.1 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	40.3 Hz
Qts	0.582
Qes	0.672
Qms	4.367
Vas	71.7 L
Sd	518.7 cm²
Xmax	2.8 mm
Re	2.7 Ω
Bl	9.1 T·m
Mms	82 g
Pe	50 W
Sensitivity	95.1 dB

Alignment hint

EBP	60 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 150.6 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
Pioneer TS-W1RS	40.2 -0.1	0.516 -0.07	75.5 +3.8	4.2 +1.4	95.5 +0.4	close		+
Audax HT300G0	36.8 -3.5	0.531 -0.05	77.7 +6	6.6 +3.8	94.4 -0.7	usable		+
Supravox T285HF64	55 +14.7	0.6 +0.02	74.6 +2.9	3.3 +0.5	95.6 +0.5	usable	8 Ω vs 4 Ω: amp load changes	+
Siare 31TE vp 1	43.8 +3.5	0.545 -0.04	91.5 +19.8	4.5 +1.7	95.5 +0.4	usable	8 Ω vs 4 Ω: amp load changes	+
Skytronic 902.436	42 +1.7	0.6 +0.02	65 -6.7	4 +1.2	89.8 -5.3	usable	8 Ω vs 4 Ω: amp load changes	+
Elder Audio 12LB075-UMOD	40 -0.3	0.472 -0.11	73 +1.3	5.5 +2.7	93.1 -2	usable	8 Ω vs 4 Ω: amp load changes	+
Dayton Audio 310-8	44.4 +4.1	0.482 -0.1	81.9 +10.2	3.5 +0.7	94.9 -0.2	usable	8 Ω vs 4 Ω: amp load changes	+
B&C 12 CLX 64	54 +13.7	0.575 -0.01	74 +2.3	5.3 +2.5	96.3 +1.2	usable	8 Ω vs 4 Ω: amp load changes	+
Conrad CPA 15-300	43 +2.7	0.559 -0.02	100.5 +28.8	4 +1.2	93.8 -1.3	usable	8 Ω vs 4 Ω: amp load changes	+
Monacor CRB-12TC vp parallèle	31 -9.3	0.611 +0.03	75 +3.3	4.9 +2.1	93.5 -1.6	usable	2 Ω vs 4 Ω: amp load changes	+

Compare the closest 3 against the PSL 300/50 →

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.