Radian 5212B

12" · 8 Ω · 375 W · 98.2 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	62 Hz
Qts	0.42
Qes	0.44
Qms	9.2
Vas	58.4 L
Sd	500 cm²
Xmax	5.4 mm
Re	6 Ω
Bl	14.5 T·m
Mms	39.5 g
Pe	375 W
Sensitivity	98.2 dB

Alignment hint

EBP	141 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 31.8 L

EBP > 100: favours a ported (bass-reflex) 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
Fane COLOSSUS 12MBN	55 -7	0.396 -0.02	63 +4.6	5.5 +0.1	97.4 -0.8	close		+
Beyma 12MC500	57 -5	0.373 -0.05	54.9 -3.5	5.5 +0.1	97.8 -0.4	close		+
Faital PRO 12HX500	54 -8	0.396 -0.02	62.3 +3.9	5.5 +0.1	97.2 -1	close		+
Faital PRO 12HX230	55 -7	0.433 +0.01	56.6 -1.8	4.7 -0.7	96.9 -1.3	close	250 W vs 375 W: lower power handling · Xmax 4.7 mm < 5.4 mm: lower excursion-limited SPL	+
P.Audio SN-12MB mk2	62 =	0.413 -0.01	43.6 -14.8	5 -0.4	97.6 -0.6	close	Xmax 5 mm < 5.4 mm: lower excursion-limited SPL	+
18 Sound 12W700	58 -4	0.36 -0.06	55 -3.4	6.5 +1.1	98 -0.2	close		+
Beyma 12MCS500-8	62 =	0.417 =	44 -14.4	4.9 -0.5	97.2 -1	close	Xmax 4.9 mm < 5.4 mm: lower excursion-limited SPL	+
Beyma 12MCS500	57 -5	0.36 -0.06	57 -1.4	8 +2.6	98 -0.2	close		+
Faital PRO 12PR310-8	54 -8	0.396 -0.02	62.8 +4.4	4.9 -0.5	97.5 -0.7	close	Xmax 4.9 mm < 5.4 mm: lower excursion-limited SPL	+
Faital PRO 12FH520	55 -7	0.47 +0.05	56.4 -2	7 +1.6	97 -1.2	close	16 Ω vs 8 Ω: amp load changes	+

Compare the closest 3 against the 5212B →

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.