Mach 5 Audio UXL-18

18" · 4 Ω · 600 W · 94 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	4 Ω
Fs	18.6 Hz
Qts	0.282
Qes	0.29
Qms	9.7
Vas	285.5 L
Sd	1029.2 cm²
Xmax	10 mm
Re	3.2 Ω
Bl	22.2 T·m
Mms	380.8 g
Pe	600 W
Sensitivity	94 dB

Alignment hint

EBP	64 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 54 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
Dayton Audio RSS460HO-4 v2015	18.8 +0.2	0.322 +0.04	272 -13.5	11.9 +1.9	93.1 -0.9	close		+
BMS 18N850 8 Ohms	24.4 +5.8	0.251 -0.03	288 +2.5	10.6 +0.6	95.5 +1.5	usable	8 Ω vs 4 Ω: amp load changes	+
TC Sounds LMS-ULTRA 5400	20.5 +1.9	0.325 +0.04	240.7 -44.8	16 +6	93.1 -0.9	usable		+
BMS 18N850 4 Ohms	23.7 +5.1	0.261 -0.02	288 +2.5	11 +1	97.8 +3.8	usable		+
Dayton Audio RSS460HO-4	19.6 +1	0.387 +0.11	298 +12.5	12.8 +2.8	92.9 -1.1	usable		+
BMS 18S450	29 +10.4	0.31 +0.03	281 -4.5	12 +2	95 +1	usable	8 Ω vs 4 Ω: amp load changes	+
Volt RV4564	26 +7.4	0.313 +0.03	238 -47.5	9.6 -0.4	94.3 +0.3	usable	8 Ω vs 4 Ω: amp load changes · Xmax 9.6 mm < 10 mm: lower excursion-limited SPL	+
CSS Audio Maelstrom 18 DVC by Exodus Audio	17.4 -1.2	0.376 +0.09	313 +27.5	14.7 +4.7	91.2 -2.8	usable		+
Stereo Integrity HST-18 MKII	15.6 -3	0.327 +0.05	307 +21.5	19 +9	90.4 -3.6	usable		+
BMS 18N840V2	28.5 +9.9	0.314 +0.03	288 +2.5	10 =	97.1 +3.1	usable	8 Ω vs 4 Ω: amp load changes	+

Compare the closest 3 against the UXL-18 →

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.