18 Sound 15NMB420

15" · 8 Ω · 450 W · 99 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	8 Ω
Fs	42 Hz
Qts	0.29
Qes	0.3
Qms	6
Vas	225 L
Sd	900 cm²
Xmax	6.5 mm
Re	5.6 Ω
Bl	19 T·m
Mms	73 g
Pe	450 W
Sensitivity	99 dB

Alignment hint

EBP	140 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 45.5 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
18 Sound 15W700	38 -4	0.3 +0.01	217 -8	6.5 =	99 =	close		+
Fane FC-153F01	40 -2	0.305 +0.02	220 -5	6.6 +0.1	100 +1	close		+
Beyma 15XA38Nd v2020	38 -4	0.296 +0.01	238 +13	6 -0.5	99 =	close	350 W vs 450 W: lower power handling · Xmax 6 mm < 6.5 mm: lower excursion-limited SPL	+
Beyma 15WR400 v2020	36 -6	0.299 +0.01	236 +11	6.3 -0.2	99 =	close	Xmax 6.3 mm < 6.5 mm: lower excursion-limited SPL	+
Beyma 15"WR400	36 -6	0.3 +0.01	236 +11	6.3 -0.2	99 =	close	Xmax 6.3 mm < 6.5 mm: lower excursion-limited SPL	+
18 Sound 15ND830	39 -3	0.32 +0.03	213 -12	6.5 =	98 -1	close		+
18 Sound 15W750	39 -3	0.29 =	253 +28	8 +1.5	97 -2	close	4 Ω vs 8 Ω: amp load changes	+
Beyma 15MW/ND	40 -2	0.331 +0.04	207 -18	6.5 =	99.4 +0.4	close		+
Beyma 15WR400	38 -4	0.308 +0.02	214 -11	6 -0.5	99.7 +0.7	close	Xmax 6 mm < 6.5 mm: lower excursion-limited SPL	+
Eminence PS15-5008	38.8 -3.2	0.273 -0.02	198.7 -26.3	6.3 -0.2	99.8 +0.8	close	Xmax 6.3 mm < 6.5 mm: lower excursion-limited SPL	+

Compare the closest 3 against the 15NMB420 →

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.