18 Sound 15ND840

15" · 8 Ω · 600 W · 99 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	8 Ω
Fs	43 Hz
Qts	0.37
Qes	0.39
Qms	6.6
Vas	163 L
Sd	881.4 cm²
Xmax	9.5 mm
Re	5 Ω
Bl	17.9 T·m
Mms	94 g
Pe	600 W
Sensitivity	99 dB

Alignment hint

EBP	110 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 61.5 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 15ND940	41 -2	0.36 -0.01	166 +3	9.5 =	98.5 -0.5	close	16 Ω vs 8 Ω: amp load changes	+
Sica 15 N 3 PL	46.9 +3.9	0.37 =	140.4 -22.6	10 +0.5	99.8 +0.8	close	400 W vs 600 W: lower power handling	+
Eminence KILOMAX PRO 15	41 -2	0.383 +0.01	154.5 -8.5	7.9 -1.6	98.3 -0.7	close	Xmax 7.9 mm < 9.5 mm: lower excursion-limited SPL	+
Eminence KILOMAX PRO 15 A	41 -2	0.383 +0.01	154.5 -8.5	7.9 -1.6	98.3 -0.7	close	Xmax 7.9 mm < 9.5 mm: lower excursion-limited SPL	+
Eminence KILOMAX 15	41 -2	0.383 +0.01	154 -9	7.9 -1.6	98.3 -0.7	close	Xmax 7.9 mm < 9.5 mm: lower excursion-limited SPL	+
Oberton 15MB500	41.5 -1.5	0.339 -0.03	161.54 -1.46	7.75 -1.75	100 +1	close	Xmax 7.75 mm < 9.5 mm: lower excursion-limited SPL	+
LaVoce WAF153.00	43 =	0.374 =	146 -17	6.5 -3	99 =	close	Xmax 6.5 mm < 9.5 mm: lower excursion-limited SPL	+
Elokance 15WF2400	38 -5	0.32 -0.05	165.2 +2.2	10.5 +1	98.1 -0.9	close		+
Eminence KAPPALITE 3015 LF	42 -1	0.387 +0.02	158.8 -4.2	6.4 -3.1	98.3 -0.7	close	450 W vs 600 W: lower power handling · Xmax 6.4 mm < 9.5 mm: lower excursion-limited SPL	+
Beyma 15MC700	41 -2	0.352 -0.02	153 -10	7.4 -2.1	97.7 -1.3	close	Xmax 7.4 mm < 9.5 mm: lower excursion-limited SPL	+

Compare the closest 3 against the 15ND840 →

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.