PD PD 1851/2

18" · 8 Ω · 1000 W · 98.3 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	37 Hz
Qts	0.286
Qes	0.29
Qms	18.49
Vas	160.5 L
Sd	1164.2 cm²
Xmax	6.7 mm
Re	5.23 Ω
Bl	30.3 T·m
Mms	218.7 g
Pe	1000 W
Sensitivity	98.3 dB

Alignment hint

EBP	128 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 31.4 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 1851/2	37 =	0.286 =	160.5 =	6.7 =	98.3 =	close		+
Oberton 18XB1300	35.2 -1.8	0.287 =	170.9 +10.4	8 +1.3	97.8 -0.5	close		+
B&C 18PZB100	38 +1	0.28 -0.01	164 +3.5	8 +1.3	96.5 -1.8	close	4 Ω vs 8 Ω: amp load changes · 700 W vs 1000 W: lower power handling	+
Oberton 18NXB700	36.24 -0.76	0.312 +0.03	155.46 -5.04	9 +2.3	98 -0.3	close		+
Oberton 18XB1301	35.7 -1.3	0.302 +0.02	172.9 +12.4	8.2 +1.5	97.9 -0.4	close		+
Oberton 18XB1201	38.05 +1.05	0.317 +0.03	159.37 -1.13	10.5 +3.8	98.5 +0.2	close		+
Oberton 18NXB1601	34.6 -2.4	0.286 =	146.2 -14.3	8.2 +1.5	96.9 -1.4	close		+
18 Sound 18NLW9600	34 -3	0.281 =	149 -11.5	9 +2.3	97.3 -1	close		+
Oberton 18XB700	36.1 -0.9	0.304 +0.02	183.22 +22.72	9 +2.3	98 -0.3	close		+
SICA 18 F 4 CP	38 +1	0.29 =	185.2 +24.7	6.2 -0.5	97 -1.3	close	700 W vs 1000 W: lower power handling · Xmax 6.2 mm < 6.7 mm: lower excursion-limited SPL	+

Compare the closest 3 against the PD 1851/2 →

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.