GRS 12SW-4

12" · 4 Ω · 120 W · 88.1 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	29.6 Hz
Qts	0.991
Qes	1.27
Qms	4.51
Vas	90 L
Sd	530 cm²
Xmax	4.5 mm
Re	3.57 Ω
Bl	8.1 T·m
Mms	126.5 g
Pe	120 W
Sensitivity	88.1 dB

Alignment hint

EBP	23 · 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
Oxygen SPIRAL 12.1	27 -2.6	0.749 -0.24	94 +4	7 +2.5	88.7 +0.6	usable		+
Kenwood KFC-W3013	25 -4.6	0.82 -0.17	83.7 -6.3	7.6 +3.1	87.3 -0.8	usable		+
Goldwood GW-1248	33.3 +3.7	0.933 -0.06	103.6 +13.6	3 -1.5	87.2 -0.9	usable	8 Ω vs 4 Ω: amp load changes · Xmax 3 mm < 4.5 mm: lower excursion-limited SPL	+
Peerless XXLS-P830845 v2025	29 -0.6	0.654 -0.34	91.9 +1.9	7.6 +3.1	88.5 +0.4	usable	8 Ω vs 4 Ω: amp load changes	+
Pioneer TS-W304R	28.6 -1	0.701 -0.29	77.9 -12.1	4.7 +0.2	90.2 +2.1	usable		+
Pioneer TS-W306R	24.6 -5	0.815 -0.18	102.1 +12.1	11.6 +7.1	87.9 -0.2	usable		+
Sony XS-NW1201	27.5 -2.1	0.928 -0.06	151.21 +61.21	4.15 -0.35	86.7 -1.4	usable	Xmax 4.15 mm < 4.5 mm: lower excursion-limited SPL	+
MTX Audio RTL12-44 DVC	30.4 +0.8	0.761 -0.23	74 -16	7.1 +2.6	91.7 +3.6	usable		+
Sphynx SP-W12-GLB	32 +2.4	0.782 -0.21	65.9 -24.1	5.8 +1.3	86 -2.1	usable	8 Ω vs 4 Ω: amp load changes	+
Lautsprecher Technik MHB-12	38.2 +8.6	1.107 +0.12	132.7 +42.7	5 +0.5	88.9 +0.8	usable	8 Ω vs 4 Ω: amp load changes	+

Compare the closest 3 against the 12SW-4 →

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.