18 Sound 12NDA520

12" · 8 Ω · 300 W · 100.5 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	50 Hz
Qts	0.27
Qes	0.28
Qms	5.5
Vas	111 L
Sd	531 cm²
Xmax	4 mm
Re	5.2 Ω
Bl	14.4 T·m
Mms	36 g
Pe	300 W
Sensitivity	100.5 dB

Alignment hint

EBP	179 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 18.9 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
Eighteen Sound 12ND520	50 =	0.27 =	111 =	4 =	98.7 -1.8	close		+
18 Sound 12NMB420	53 +3	0.28 +0.01	105 -6	4 =	100.5 =	close		+
Fane STUDIO 12L	49 -1	0.241 -0.03	120.9 +9.9	4.3 +0.3	101.2 +0.7	close	200 W vs 300 W: lower power handling	+
18 Sound 12MB700	46 -4	0.25 -0.02	100 -11	4.5 +0.5	100.5 =	close	16 Ω vs 8 Ω: amp load changes	+
Eminence KAPPA-12A	45 -5	0.27 =	112.1 +1.1	3.2 -0.8	99.3 -1.2	close	Xmax 3.2 mm < 4 mm: lower excursion-limited SPL	+
Eminence KAPPA 12	45 -5	0.27 =	112.1 +1.1	3.2 -0.8	99.3 -1.2	close	Xmax 3.2 mm < 4 mm: lower excursion-limited SPL	+
Eminence KAPPA 12 A	45 -5	0.27 =	112.1 +1.1	3.2 -0.8	99.3 -1.2	close	Xmax 3.2 mm < 4 mm: lower excursion-limited SPL	+
B&C 12 PL 32	49 -1	0.249 -0.02	97 -14	3.5 -0.5	100.2 -0.3	close	Xmax 3.5 mm < 4 mm: lower excursion-limited SPL	+
B&C 12 PL 32 8 Ohms	49 -1	0.249 -0.02	97 -14	3.5 -0.5	100.2 -0.3	close	Xmax 3.5 mm < 4 mm: lower excursion-limited SPL	+
P.Audio SN-12MB	50 =	0.296 +0.03	95.3 -15.7	5 +1	99.3 -1.2	close		+

Compare the closest 3 against the 12NDA520 →

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.