PHL Audio 7321ND

18" · 8 Ω · 1300 W · 98.3 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	33 Hz
Qts	0.278
Qes	0.3
Qms	3.8
Vas	230 L
Sd	1250 cm²
Xmax	8.5 mm
Re	5.2 Ω
Bl	28.2 T·m
Mms	221.5 g
Pe	1300 W
Sensitivity	98.3 dB

Alignment hint

EBP	110 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 42.1 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
Beyma 18PW1400/FE	32 -1	0.273 -0.01	228.9 -1.1	9.1 +0.6	98.3 =	close		+
Beyma 18PW1400FE /S	32 -1	0.27 -0.01	228.9 -1.1	10 +1.5	98 -0.3	close		+
Oberton 18FBR700	35.56 +2.56	0.271 -0.01	231.3 +1.3	8 -0.5	98 -0.3	close	700 W vs 1300 W: lower power handling · Xmax 8 mm < 8.5 mm: lower excursion-limited SPL	+
Precision Devices PD188	37.409 +4.41	0.28 =	224.419 -5.58	9.5 +1	98.5 +0.2	close	600 W vs 1300 W: lower power handling	+
Monacor SP-18/1000HP	35 +2	0.282 =	219 -11	7.9 -0.6	98.8 +0.5	close	1000 W vs 1300 W: lower power handling · Xmax 7.9 mm < 8.5 mm: lower excursion-limited SPL	+
RCF LF18G401	33 =	0.29 +0.01	268 +38	9 +0.5	98 -0.3	close	900 W vs 1300 W: lower power handling	+
RCF LF18G908	33 =	0.29 +0.01	268 +38	9 +0.5	98 -0.3	close	900 W vs 1300 W: lower power handling	+
B&C 18 TBX 46	31 -2	0.277 =	270 +40	9 +0.5	98.2 -0.1	close	1000 W vs 1300 W: lower power handling	+
B&C 18 TBX 46 v2	34 +1	0.311 +0.03	227 -3	8.1 -0.4	98.2 -0.1	close	1000 W vs 1300 W: lower power handling · Xmax 8.1 mm < 8.5 mm: lower excursion-limited SPL	+
18 Sound 18LW2400	33 =	0.32 +0.04	235 +5	9.5 +1	98 -0.3	close	4 Ω vs 8 Ω: amp load changes	+

Compare the closest 3 against the 7321ND →

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.