Precision Devices PD1850

18" · 8 Ω · 800 W · 98 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	30 Hz
Qts	0.21
Qes	0.22
Qms	6.04
Vas	249 L
Sd	1150 cm²
Xmax	16 mm
Re	5.4 Ω
Bl	31.57 T·m
Mms	216.4 g
Pe	800 W
Sensitivity	98 dB

Alignment hint

EBP	136 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 24.1 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 18NLW9000	32 +2	0.21 =	247 -2	14 -2	97 -1	close	4 Ω vs 8 Ω: amp load changes · Xmax 14 mm < 16 mm: lower excursion-limited SPL	+
B&C 18DS115	30 =	0.2 -0.01	168 -81	16.5 +0.5	98 =	close		+
Oberton 18NSW700	30.48 +0.48	0.243 +0.03	309.02 +60.02	14 -2	97.5 -0.5	usable	Xmax 14 mm < 16 mm: lower excursion-limited SPL	+
Beyma 18QLEX1600Fe	30 =	0.23 +0.02	195 -54	13 -3	97 -1	usable	Xmax 13 mm < 16 mm: lower excursion-limited SPL	+
Faital PRO 18XL2000	28 -2	0.27 +0.06	232.1 -16.9	16.32 +0.32	97 -1	usable		+
18 Sound 18NLW9400	32 +2	0.22 +0.01	278 +29	9.5 -6.5	98 =	usable	4 Ω vs 8 Ω: amp load changes · Xmax 9.5 mm < 16 mm: lower excursion-limited SPL	+
Faital PRO 18XL1700	28 -2	0.28 +0.07	227 -22	16.17 +0.17	97 -1	usable		+
PD PD 1850	30 =	0.212 =	249 =	6.9 -9.1	98.5 +0.5	usable	Xmax 6.9 mm < 16 mm: lower excursion-limited SPL	+
Precision Devices PD 1850	30 =	0.212 =	249 =	6.9 -9.1	98.5 +0.5	usable	Xmax 6.9 mm < 16 mm: lower excursion-limited SPL	+
18 Sound 18NLW4100	29 -1	0.27 +0.06	207 -42	15 -1	97 -1	usable	4 Ω vs 8 Ω: amp load changes · Xmax 15 mm < 16 mm: lower excursion-limited SPL	+

Compare the closest 3 against the PD1850 →

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.