Precision Devices PD 186

18" · 8 Ω · 700 W · 96.9 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	27 Hz
Qts	0.313
Qes	0.326
Qms	7.75
Vas	353 L
Sd	1150 cm²
Xmax	10.2 mm
Re	5.5 Ω
Bl	22.9 T·m
Mms	182.5 g
Pe	700 W
Sensitivity	96.9 dB

Alignment hint

EBP	83 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 86 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
PD PD 186	27 =	0.313 =	353 =	10.2 =	96.9 =	close		+
RCF L 18P200N	28 +1	0.306 -0.01	363 +10	9.8 -0.4	97 +0.1	close	Xmax 9.8 mm < 10.2 mm: lower excursion-limited SPL	+
Precision Devices PD186	27 =	0.312 =	353 =	8 -2.2	97 +0.1	close	16 Ω vs 8 Ω: amp load changes · Xmax 8 mm < 10.2 mm: lower excursion-limited SPL	+
RCF L 18P200N vp tlhp	28 +1	0.306 -0.01	380 +27	9.8 -0.4	97.2 +0.3	close	Xmax 9.8 mm < 10.2 mm: lower excursion-limited SPL	+
BMS 18N840V2	28.5 +1.5	0.314 =	288 -65	10 -0.2	97.1 +0.2	close	Xmax 10 mm < 10.2 mm: lower excursion-limited SPL	+
RCF LF18G400	28 +1	0.27 -0.04	360 +7	9 -1.2	97.5 +0.6	close	Xmax 9 mm < 10.2 mm: lower excursion-limited SPL	+
RCF LF 18X400 v2	28 +1	0.278 -0.03	340 -13	9 -1.2	98 +1.1	close	Xmax 9 mm < 10.2 mm: lower excursion-limited SPL	+
PD PD 18BR40	30 +3	0.32 +0.01	309 -44	9.3 -0.9	98 +1.1	close	Xmax 9.3 mm < 10.2 mm: lower excursion-limited SPL	+
Precision Devices PD 18BR40	30 +3	0.32 +0.01	309 -44	9.3 -0.9	98 +1.1	close	Xmax 9.3 mm < 10.2 mm: lower excursion-limited SPL	+
RCF LF18X400	28 +1	0.27 -0.04	340 -13	9 -1.2	97.5 +0.6	close	Xmax 9 mm < 10.2 mm: lower excursion-limited SPL	+

Compare the closest 3 against the PD 186 →

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.