BMS 12N820

12" · 8 Ω · 800 W · 98 dB

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	37.8 Hz
Qts	0.16
Qes	0.16
Qms	5.3
Vas	98.7 L
Sd	531 cm²
Xmax	4.5 mm
Re	5.7 Ω
Bl	24.2 T·m
Mms	72 g
Pe	800 W
Sensitivity	98 dB

Alignment hint

EBP	236 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 5.3 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
B&C 12 PZ 32	38 +0.2	0.193 +0.03	102 +3.3	5.5 +1	97.6 -0.4	close	400 W vs 800 W: lower power handling	+
B&C 12 NW 76	40 +2.2	0.163 =	76 -22.7	4.8 +0.3	98.3 +0.3	close	500 W vs 800 W: lower power handling	+
B&C 12NW76	40 +2.2	0.16 =	76 -22.7	8 +3.5	98.5 +0.5	close	500 W vs 800 W: lower power handling	+
Audax PR33S100 vp1	36.8 -1	0.164 =	124.3 +25.6	3.8 -0.7	98.9 +0.9	close	200 W vs 800 W: lower power handling · Xmax 3.8 mm < 4.5 mm: lower excursion-limited SPL	+
PHL Audio 4090	39 +1.2	0.19 +0.03	92 -6.7	5.1 +0.6	100.6 +2.6	usable	4 Ω vs 8 Ω: amp load changes · 400 W vs 800 W: lower power handling	+
Precision Devices PD122	42.9 +5.1	0.194 +0.03	90 -8.7	5.5 +1	98 =	usable	16 Ω vs 8 Ω: amp load changes · 400 W vs 800 W: lower power handling	+
PD PD 123C001	35 -2.8	0.144 -0.02	122 +23.3	6.4 +1.9	99.1 +1.1	usable	600 W vs 800 W: lower power handling	+
Precision Devices PD 123C001	35 -2.8	0.144 -0.02	122 +23.3	6.4 +1.9	99.1 +1.1	usable	600 W vs 800 W: lower power handling	+
PD PD 122	42.9 +5.1	0.196 +0.04	90 -8.7	4.7 +0.2	98.8 +0.8	usable	400 W vs 800 W: lower power handling	+
Precision Devices PD 122	42.9 +5.1	0.196 +0.04	90 -8.7	4.7 +0.2	98.8 +0.8	usable	400 W vs 800 W: lower power handling	+

Compare the closest 3 against the 12N820 →

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.