Ciare NDH18_4S

18" · 8 Ω · 1000 W · 96.5 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	31 Hz
Qts	0.319
Qes	0.33
Qms	9.8
Vas	239 L
Sd	1164 cm²
Xmax	9.4 mm
Re	6.1 Ω
Bl	27.5 T·m
Mms	209.5 g
Pe	1000 W
Sensitivity	96.5 dB

Alignment hint

EBP	94 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 61.1 L

EBP 50-100: works in either a sealed or ported 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 18-1000	32 +1	0.319 =	236 -3	8.9 -0.5	97 +0.5	close	Xmax 8.9 mm < 9.4 mm: lower excursion-limited SPL	+
RCF LF 18N405	30 -1	0.324 +0.01	227 -12	10.8 +1.4	96.7 +0.2	close		+
18 Sound 18LW2400	33 +2	0.32 =	235 -4	9.5 +0.1	98 +1.5	close	4 Ω vs 8 Ω: amp load changes	+
RCF LF18N405	30 -1	0.32 =	227 -12	14 +4.6	97 +0.5	close		+
Peavey LO MAX 18	33.5 +2.5	0.318 =	249.7 +10.7	9.5 +0.1	97.7 +1.2	close		+
Dayton Audio APOLLO 18N	32 +1	0.338 +0.02	253.6 +14.6	9.1 -0.3	96.9 +0.4	close	Xmax 9.1 mm < 9.4 mm: lower excursion-limited SPL	+
Eminence DEFINIMAX 4018 LF	32 +1	0.348 +0.03	237.9 -1.1	8.6 -0.8	96.4 -0.1	close	Xmax 8.6 mm < 9.4 mm: lower excursion-limited SPL	+
BMS 18N850vv2	29.8 -1.2	0.33 +0.01	243 +4	12 +2.6	95 -1.5	close		+
Beyma 18SW1600ND	32 +1	0.33 +0.01	205.7 -33.3	10 +0.6	96.6 +0.1	close		+
18 Sound 18LW1400	33 +2	0.32 =	210 -29	9 -0.4	97 +0.5	close	4 Ω vs 8 Ω: amp load changes · Xmax 9 mm < 9.4 mm: lower excursion-limited SPL	+

Compare the closest 3 against the NDH18_4S →

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.