PHL Audio 4021

12" · 8 Ω · 450 W · 91.6 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	35.4 Hz
Qts	0.367
Qes	0.39
Qms	6.3
Vas	55.2 L
Sd	539 cm²
Xmax	6.5 mm
Re	5.5 Ω
Bl	21.6 T·m
Mms	148.9 g
Pe	450 W
Sensitivity	91.6 dB

Alignment hint

EBP	91 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 20.4 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
Ground Zero GZRW 30SPL vp	33.3 -2.1	0.357 -0.01	52 -3.2	9.1 +2.6	92 +0.4	close		+
B&C 12 FG 100	34 -1.4	0.362 -0.01	49 -6.2	9.5 +3	91 -0.6	close		+
B&C 12FG100	34 -1.4	0.36 -0.01	49 -6.2	10.3 +3.8	91 -0.6	close		+
SICA 12 SR 3 PL v2018	36 +0.6	0.418 +0.05	60.4 +5.2	7 +0.5	91.7 +0.1	close		+
Sica 12 SR 3 PL	36 +0.6	0.42 +0.05	60.4 +5.2	7 +0.5	91.8 +0.2	close		+
Sica 12 SR 3 CP	37 +1.6	0.4 +0.03	60.9 +5.7	8 +1.5	92.2 +0.6	close		+
SICA 12 SR 3 CP v2018	36.8 +1.4	0.387 +0.02	64 +8.8	6 -0.5	92.5 +0.9	close	350 W vs 450 W: lower power handling · Xmax 6 mm < 6.5 mm: lower excursion-limited SPL	+
Celestion FTR12-4080DL/4	35.3 -0.1	0.428 +0.06	51.4 -3.8	8 +1.5	92.5 +0.9	close	4 Ω vs 8 Ω: amp load changes	+
Pioneer TS-W306C	32.6 -2.8	0.414 +0.05	55.6 +0.4	8.1 +1.6	92.8 +1.2	close	4 Ω vs 8 Ω: amp load changes	+
Pioneer TS-W305C	32.7 -2.7	0.34 -0.03	51.5 -3.7	7.1 +0.6	93.4 +1.8	close	4 Ω vs 8 Ω: amp load changes	+

Compare the closest 3 against the 4021 →

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.