Sony XS-GTR121L

12" · 4 Ω · 400 W · 88.3 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	35 Hz
Qts	0.46
Qes	0.488
Qms	7.9
Vas	50 L
Sd	498 cm²
Xmax	8.4 mm
Re	3.51 Ω
Bl	15.2 T·m
Mms	146 g
Pe	400 W
Sensitivity	88.3 dB

Alignment hint

EBP	72 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 36.7 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
Pioneer TS-W306DVC	32.9 -2.1	0.478 +0.02	51.8 +1.8	8.3 -0.1	88.9 +0.6	close	8 Ω vs 4 Ω: amp load changes · Xmax 8.3 mm < 8.4 mm: lower excursion-limited SPL	+
Hertz Audio HX 300	33 -2	0.47 +0.01	49.62 -0.38	14 +5.6	87.1 -1.2	close		+
Pioneer TS-W126C(PREMIER)	32.6 -2.4	0.42 -0.04	55.614 +5.61	8.7 +0.3	88.4 +0.1	close		+
Focal E30KX	29 -6	0.454 -0.01	50 =	10.7 +2.3	86.9 -1.4	close	8 Ω vs 4 Ω: amp load changes	+
Focal SUB30KXE	29 -6	0.454 -0.01	50 =	10.8 +2.4	86.9 -1.4	close	8 Ω vs 4 Ω: amp load changes	+
Celestion FTR12-4080DL/4	35.3 +0.3	0.428 -0.03	51.4 +1.4	8 -0.4	92.5 +4.2	close	Xmax 8 mm < 8.4 mm: lower excursion-limited SPL	+
Ground Zero GZRW 12XD-AL	29 -6	0.451 -0.01	52 +2	9.2 +0.8	86.1 -2.2	close	8 Ω vs 4 Ω: amp load changes	+
DLS ULTIMATE IRIDIUM 12	33.8 -1.2	0.386 -0.07	49.2 -0.8	7 -1.4	88.8 +0.5	close	8 Ω vs 4 Ω: amp load changes · Xmax 7 mm < 8.4 mm: lower excursion-limited SPL	+
Fountek FW323 - 4 Ohms	30 -5	0.452 -0.01	51.4 +1.4	6.6 -1.8	89.7 +1.4	close	Xmax 6.6 mm < 8.4 mm: lower excursion-limited SPL	+
Audiobahn AW120T	32.4 -2.6	0.39 -0.07	45 -5	9 +0.6	87.5 -0.8	close		+

Compare the closest 3 against the XS-GTR121L →

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.