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Sony XS-L121P5S

12" · 4 Ω · 350 W · 89 dB · datasheet ↗

Thiele-Small parameters

Nominal size12"
Impedance4 Ω
Fs22.6 Hz
Qts0.51
Qes0.55
Qms5.59
Vas102.1 L
Sd515 cm²
Xmax11.5 mm
Re3.3 Ω
Bl12.5 T·m
Mms183.3 g
Pe350 W
Sensitivity89 dB

Alignment hint

EBP41 · sealed
Sealed Vb (Qtc ≈ 0.71)≈ 110.7 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

DriverFs (Hz)QtsVas (L)Xmax (mm)Sens (dB)FitNotesCompare
Blaupunkt VCS 120023 +0.40.487 -0.02102 -0.113 +1.589.9 +0.9close+
CSS Audio TRIO12 vp22 -0.60.429 -0.0897 -5.110 -1.588.5 -0.5close8 Ω vs 4 Ω: amp load changes · Xmax 10 mm < 11.5 mm: lower excursion-limited SPL+
Infinity KAPPA PERFECT 12.123.32 +0.720.44 -0.0799.97 -2.1314.15 +2.6586.2 -2.8close+
Dayton Audio RSS315HF-425 +2.40.489 -0.0285.1 -1710.1 -1.489.4 +0.4closeXmax 10.1 mm < 11.5 mm: lower excursion-limited SPL+
Dayton Audio RSS315HFA-8 v201622.2 -0.40.444 -0.0797.2 -4.911 -0.585.8 -3.2close8 Ω vs 4 Ω: amp load changes · Xmax 11 mm < 11.5 mm: lower excursion-limited SPL+
Ground Zero GZTW 30T25 +2.40.443 -0.07110 +7.911.9 +0.490.7 +1.7close+
JL Audio 13W6V2-D424.3 +1.70.434 -0.08111.6 +9.510.6 -0.988.3 -0.7usable8 Ω vs 4 Ω: amp load changes · Xmax 10.6 mm < 11.5 mm: lower excursion-limited SPL+
Thiel TSW 12.1 vp20 -2.60.505 -0.01112 +9.98.6 -2.989.9 +0.9usable150 W vs 350 W: lower power handling · Xmax 8.6 mm < 11.5 mm: lower excursion-limited SPL+
Rockford Fosgate P1S41225 +2.40.537 +0.03109 +6.99 -2.590.4 +1.4usable250 W vs 350 W: lower power handling · Xmax 9 mm < 11.5 mm: lower excursion-limited SPL+
Focal AUDITOR RSB-30025 +2.40.466 -0.0493 -9.110.2 -1.387.4 -1.6usable8 Ω vs 4 Ω: amp load changes · Xmax 10.2 mm < 11.5 mm: lower excursion-limited SPL+

Compare the closest 3 against the XS-L121P5S →

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)

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