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Description

Sundown Audio X-18 v.3 D1

Designed with an extended pole piece and an incredible four inches of peak-to-peak excursion, the X v.3 is engineered for ultra-deep bass and high power handling. Engineered to set a new standard in the low-frequency/small-ported-box subwoofer category, the X Series can also work in up to a 50% larger enclosure if you desire even more low-end extension.The X v.3 series differentiates itself with its incredibly linear suspension, ensuring the lowest level of bass extension in a small enclosure while maintaining extremely low levels of distortion. Notably, the v.3 series features a much larger motor structure (220mm vs. 190mm on the v.1 series), improved motor ventilation, and an all-new Mega-Roll v.2 surround, providing a more linear and rugged update to the world-famous Mega-Roll v.1 surround design.


Specifications

RE (Ohms) 1.4 3.2
FS (Hz) 26.650 28.207
VAS (L) 130.302 109.935
Qes 0.526 0.657
Qms 2.793 3.091
Qts 0.442 0.542
Le (mH)
BL (NA) 14.543 20.854
Mms (Grams) 474.114 504.115
Cms (uM/N) 75.224 63.154
Sens (dB @ 1w/1m) 88.6dB 87.6dB
Xmax 30mm 30mm
T/S SPECS X V.3 18″ D1 X V.3 18″ D2

Enclosure Specifications
X v.3 18
Sealed Enclosure N/A
Ported Enclosure 7.00 cu ft
Recommended Tuning 32hz
Recommended Port Area 112 sq in
Displacement 0.23 cu ft
Depth 13.6″
Outside Diam. 18.42″
Cutout 16.69″

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Questions and Answers

Q1: Is the Sundown Audio X-18 v.3 D1 a subwoofer or a speaker?

A1: It is a true subwoofer, engineered specifically for deep, powerful low-frequency bass, not mids or vocals.

Q2: What does D1 mean in X-18 v.3 D1?

A2: D1 means dual 1-ohm voice coils, allowing wiring options such as 0.5 ohm or 2 ohm, depending on amplifier requirements.

Q3: Is this subwoofer suitable for SPL competition systems?

A3: Yes. The X-Series v.3 is designed for extreme excursion and very high power handling, making it ideal for SPL and competition-level systems.

Q4: Can the X-18 v.3 D1 be used in sealed and ported enclosures?

A4: Yes. It performs best in large sealed enclosures for control or ported enclosures for maximum output.

Q5: What type of amplifier should be used with this subwoofer?

A5: A high-quality high-power mono Class-D amplifier matched to the final wired impedance is strongly recommended.


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