Precision Devices PD.185C003-8

18" · 8 Ω · 1000 W · 97.3 dB

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	33 Hz
Qts	0.24
Qes	0.229
Qms	10.6
Vas	224 L
Sd	1164 cm²
Xmax	11 mm
Re	5.4 Ω
Bl	31.5 T·m
Mms	197 g
Pe	1000 W
Sensitivity	97.3 dB

Alignment hint

EBP	144 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 29.2 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
Precision Devices PD.1850/2	33.1 +0.1	0.24 =	203.84 -20.16	11.1 +0.1	96.7 -0.6	close		+
RCF LF18N451	31 -2	0.24 =	245 +21	9 -2	97.5 +0.2	close	Xmax 9 mm < 11 mm: lower excursion-limited SPL	+
Beyma 18PW1400FE /S	32 -1	0.27 +0.03	228.9 +4.9	10 -1	98 +0.7	close	Xmax 10 mm < 11 mm: lower excursion-limited SPL	+
Precision Devices PD.185N02	35.2 +2.2	0.24 =	178.28 -45.72	12 +1	96.8 -0.5	close		+
Beyma 18QLEX1600Fe	30 -3	0.23 -0.01	195 -29	13 +2	97 -0.3	close		+
PD PD 185C003	33 =	0.224 -0.02	224 =	8.8 -2.2	99.1 +1.8	close	Xmax 8.8 mm < 11 mm: lower excursion-limited SPL	+
Precision Devices PD 185C003	33 =	0.224 -0.02	224 =	8.8 -2.2	99.1 +1.8	close	Xmax 8.8 mm < 11 mm: lower excursion-limited SPL	+
18 Sound 18NLW9000	32 -1	0.21 -0.03	247 +23	14 +3	97 -0.3	close	4 Ω vs 8 Ω: amp load changes	+
RCF LF 18X451	30 -3	0.278 +0.04	220 -4	10.7 -0.3	96.8 -0.5	close	Xmax 10.7 mm < 11 mm: lower excursion-limited SPL	+
RCF LF 18N451	31 -2	0.24 =	245 +21	8.8 -2.2	98.7 +1.4	close	Xmax 8.8 mm < 11 mm: lower excursion-limited SPL	+

Compare the closest 3 against the PD.185C003-8 →

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.