BMS 12N803

12" · 8 Ω · 1000 W · 97 dB

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	41 Hz
Qts	0.24
Qes	0.25
Qms	5.2
Vas	77 L
Sd	531 cm²
Xmax	6 mm
Re	5.7 Ω
Bl	21.35 T·m
Mms	78 g
Pe	1000 W
Sensitivity	97 dB

Alignment hint

EBP	164 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 10 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 12XB	43 +2	0.243 =	78 +1	6 =	97.7 +0.7	close	500 W vs 1000 W: lower power handling	+
RCF L 12P300	40 -1	0.242 =	81 +4	7.8 +1.8	96.7 -0.3	close		+
Faital PRO 12FH510	45 +4	0.25 +0.01	75.2 -1.8	7.5 +1.5	97 =	close	4 Ω vs 8 Ω: amp load changes · 500 W vs 1000 W: lower power handling	+
Faital PRO 12FH510	45 +4	0.24 =	81.3 +4.3	7.5 +1.5	98 +1	close	500 W vs 1000 W: lower power handling	+
Monacor SP-12/500FH	45 +4	0.251 +0.01	76.2 -0.8	6.4 +0.4	98.2 +1.2	close	500 W vs 1000 W: lower power handling	+
PHL Audio 4400Nd	41 =	0.216 -0.02	70 -7	5.7 -0.3	96.7 -0.3	close	600 W vs 1000 W: lower power handling · Xmax 5.7 mm < 6 mm: lower excursion-limited SPL	+
Oberton 12B401	46.63 +5.63	0.245 +0.01	69.6 -7.4	6.75 +0.75	97 =	close	400 W vs 1000 W: lower power handling	+
Faital PRO 12FH500	45 +4	0.22 -0.02	80.3 +3.3	7.25 +1.25	97 =	close	4 Ω vs 8 Ω: amp load changes · 500 W vs 1000 W: lower power handling	+
PHL Audio B303-8 4230	40 -1	0.22 -0.02	87.2 +10.2	5.8 -0.2	97.3 +0.3	close	450 W vs 1000 W: lower power handling · Xmax 5.8 mm < 6 mm: lower excursion-limited SPL	+
Beyma 12LW30/N v2015	42 +1	0.269 +0.03	84 +7	6.1 +0.1	96.3 -0.7	close	450 W vs 1000 W: lower power handling	+

Compare the closest 3 against the 12N803 →

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.