Radian 512/2 BK-8

12" · 8 Ω · 300 W · 94.9 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	45.1 Hz
Qts	0.489
Qes	0.57
Qms	3.46
Vas	106.8 L
Sd	515 cm²
Xmax	0.9 mm
Re	7 Ω
Bl	12.3 T·m
Mms	43.3 g
Pe	300 W
Sensitivity	94.9 dB

Alignment hint

EBP	79 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 97.9 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
Monacor SP-12 vp nº1	45.8 +0.7	0.458 -0.03	104.3 -2.5	3.9 +3	95.6 +0.7	close	100 W vs 300 W: lower power handling	+
Radian 5212-8	45.1 =	0.489 =	87.9 -18.9	5 +4.1	94.7 -0.2	usable		+
Celestion PULSE12	45 -0.1	0.42 -0.07	104.77 -2.03	3.8 +2.9	94.7 -0.2	usable	200 W vs 300 W: lower power handling	+
Altec 417-16LF	47.7 +2.6	0.376 -0.11	107 +0.2	1.3 +0.4	94.8 -0.1	usable	16 Ω vs 8 Ω: amp load changes · 100 W vs 300 W: lower power handling	+
Dayton Audio 310-8	44.4 -0.7	0.482 -0.01	81.9 -24.9	3.5 +2.6	94.9 =	usable	80 W vs 300 W: lower power handling	+
PHL Audio 4530 vp	45.8 +0.7	0.45 -0.04	104.5 -2.3	6 +5.1	95.8 +0.9	usable		+
Eminence BETA-12LTA	45 -0.1	0.51 +0.02	136.3 +29.5	3.2 +2.3	95.4 +0.5	usable	225 W vs 300 W: lower power handling	+
Siare 31TE vp 2	41.3 -3.8	0.506 +0.02	99.9 -6.9	4.7 +3.8	95.6 +0.7	usable	120 W vs 300 W: lower power handling	+
Altec 920-8A	48 +2.9	0.501 +0.01	141.6 +34.8	1.3 +0.4	96.9 +2	usable	125 W vs 300 W: lower power handling	+
University Sound 312 200	50.5 +5.4	0.503 +0.01	85 -21.8	2 +1.1	94.4 -0.5	usable	35 W vs 300 W: lower power handling	+

Compare the closest 3 against the 512/2 BK-8 →

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.