18 Sound 12NCX750

12" · 8 Ω · 400 W · 99.7 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	58 Hz
Qts	0.296
Qes	0.31
Qms	6.42
Vas	63 L
Sd	531 cm²
Xmax	4.6 mm
Re	5.4 Ω
Bl	17.3 T·m
Mms	47.2 g
Pe	400 W
Sensitivity	99.7 dB

Alignment hint

EBP	187 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 13.4 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 12FW64	55 -3	0.29 -0.01	64 +1	5 +0.4	98 -1.7	close	250 W vs 400 W: lower power handling	+
Peavey 1205-8 v1993	55.6 -2.4	0.281 -0.01	69 +6	4.5 -0.1	100 +0.3	close	Xmax 4.5 mm < 4.6 mm: lower excursion-limited SPL	+
RCF MB 12G300	61 +3	0.301 +0.01	57 -6	4.3 -0.3	100.1 +0.4	close	Xmax 4.3 mm < 4.6 mm: lower excursion-limited SPL	+
B&C 12CL64	52 -6	0.3 =	64 +1	4.5 -0.1	98 -1.7	close	250 W vs 400 W: lower power handling · Xmax 4.5 mm < 4.6 mm: lower excursion-limited SPL	+
B&C 12 FW 64	55 -3	0.293 =	64 +1	3.7 -0.9	99.1 -0.6	close	250 W vs 400 W: lower power handling · Xmax 3.7 mm < 4.6 mm: lower excursion-limited SPL	+
Ciare PW330	55 -3	0.282 -0.01	65 +2	3.8 -0.8	99.5 -0.2	close	Xmax 3.8 mm < 4.6 mm: lower excursion-limited SPL	+
Peavey BLACK WIDOW 1205-8	55.6 -2.4	0.28 -0.02	69 +6	4.5 -0.1	98 -1.7	close	5.2 Ω vs 8 Ω: amp load changes · Xmax 4.5 mm < 4.6 mm: lower excursion-limited SPL	+
Master Audio HPLSN12-500	52 -6	0.283 -0.01	65 +2	5 +0.4	97.7 -2	close		+
Fane Colossus 12MB	55 -3	0.286 -0.01	56 -7	5.5 +0.9	98 -1.7	close		+
JBL 1400 PRO	52 -6	0.314 +0.02	62.3 -0.7	7.6 +3	99 -0.7	close		+

Compare the closest 3 against the 12NCX750 →

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.