Thiel TSW 12.1 vp

12" · 4 Ω · 150 W · 89.9 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	20 Hz
Qts	0.505
Qes	0.58
Qms	3.9
Vas	112 L
Sd	491 cm²
Xmax	8.6 mm
Re	2 Ω
Bl	9.1 T·m
Mms	191.1 g
Pe	150 W
Sensitivity	89.9 dB

Alignment hint

EBP	34 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 116.6 L

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
Sony XS-L121P5S	22.6 +2.6	0.51 +0.01	102.1 -9.9	11.5 +2.9	89 -0.9	close		+
Blaupunkt VCS 1200	23 +3	0.487 -0.02	102 -10	13 +4.4	89.9 =	close		+
Rockford Fosgate P1S412	25 +5	0.537 +0.03	109 -3	9 +0.4	90.4 +0.5	close		+
Rockford Fosgate P112S4	25 +5	0.52 +0.02	110 -2	7.3 -1.3	90.6 +0.7	close	Xmax 7.3 mm < 8.6 mm: lower excursion-limited SPL	+
Tang Band WQ-1858	20 =	0.451 -0.05	116 +4	13.3 +4.7	85.3 -4.6	usable	8 Ω vs 4 Ω: amp load changes	+
Peerless XXLS-P830845	27 +7	0.517 +0.01	119.5 +7.5	7.6 -1	89.8 -0.1	usable	8 Ω vs 4 Ω: amp load changes · Xmax 7.6 mm < 8.6 mm: lower excursion-limited SPL	+
HiVi D10G	26 +6	0.465 -0.04	117.3 +5.3	8.3 -0.3	89 -0.9	usable	8 Ω vs 4 Ω: amp load changes · Xmax 8.3 mm < 8.6 mm: lower excursion-limited SPL	+
Ground Zero GZTW 12MK2 vp	22.5 +2.5	0.484 -0.02	148.6 +36.6	14.7 +6.1	89.9 =	usable	8 Ω vs 4 Ω: amp load changes	+
Ground Zero GZTW 30	25 +5	0.44 -0.06	110 -2	11.2 +2.6	90.7 +0.8	usable		+
Ground Zero GZTW 30T	25 +5	0.443 -0.06	110 -2	11.9 +3.3	90.7 +0.8	usable		+

Compare the closest 3 against the TSW 12.1 vp →

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.