Sundown X18 v4

1.549,00€

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Subwoofer

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Shipping

✓ Free shipping on orders of €49 or more within Germany and on orders of €99 or more to the EU.

✓ Delivery times vary by product and can be found on the product page; typically 1–3 business days for in-stock items; international shipping times may vary, usually 6–10 business days.

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5% discount for payment in advance

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Wiring Wizard & Port Calculator

Use our wiring assistant for easy speaker and subwoofer connections! The correct connection is important for your amplifier! Low-impedance operation can damage the amplifier! The datasheet shows you which connection each amplifier is designed for!

Our port calculator shows you the tuning characteristics of your enclosure! The net volume is always particularly important here; calculate the subwoofer’s actual resonant chamber volume beforehand to get the correct result. The net volume is calculated by subtracting all dead spaces and is crucial for enclosure design.

The Sundown Xv4 18″ subwoofer offers unrivaled power and control for demanding bass lovers. Equipped with high-quality X v.4 voice coils, this subwoofer is rated for up to 3000W RMS power and 6000W peak power, ensuring maximum performance without distortion.

The optimized design improves air circulation and cooling, ensuring long-lasting performance even under heavy use. The advanced motor structure and large cone area ensure powerful and clear reproduction.

The Xv4 18″ is perfect for closed or bass reflex cabinets and offers you flexibility in setup and tuning - whether for SPL competitions or for everyday, high-quality music enjoyment.

Robust, reliable and beautifully finished, this subwoofer is the next generation upgrade your sound system deserves.

Key features

18″ Xv4 Series Subwoofer

3000 W RMS / 6000 W peak power

Options for two 1-ohm or two 2-ohm voice coils

Precision manufactured X v.4 coils for stability

High performance 23.5cm diameter motor

Deep bass response with 30 mm Xmax

Compatibility with closed or vented enclosures

Recommended port tuning: 32 Hz

Engineered for extreme durability and clear sound

Specification	Power rating
RMS power	3000 W
Peak power	6000 W
Displacement	280L
Mounting depth	15″
Outer diameter	46,8cm
Cut-out diameter	42,4cm
Motor diameter	23,5cm
Sealed housing	Not recommended
Ported housing	198 liters
Recommended port tuning	32 Hz

TSP:	X 18" v4 D1 / D2
Xmax	30 mm
SD (conical surface)	113,41
RE (Ohm)	2,05 / 3,74
FS (Hz)	25,87 / 25,58
VAS (L)	93,67
Qes	0,63 / 0,55
Qms	4,13 / 4,03
Qts	0,54 / 0,84
BL (NA)	19,74 / 26,8
MMS	737,81 / 656,74
Sensitivity	86 / 87 dB

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Frequently asked questions about the Sundown X18 v4 subwoofer

How much power does the Sundown X18 v4 require for optimum performance?

The Sundown X18 v4 is rated at 3,000 watts RMS and delivers a peak power output of up to 6,000 watts, making it ideal for high-powered SPL and everyday set-ups.

What size enclosure does the 18-inch subwoofer require?

The X18 v4 is optimised for ported enclosures. A volume of around 198 litres (approx. 7.0 cu ft) with a recommended port tuning frequency of 32 Hz ensures maximum performance.

How low does the Sundown X18 v4 go in terms of Hz?

The subwoofer easily reaches frequencies below 20 Hz and still delivers a noticeable sound pressure level even at 15–18 Hz. Its precise low-frequency reproduction makes it the top choice for car audio enthusiasts.

Can I run two X18 v4 subwoofers in parallel?

Yes, a dual configuration is possible and doubles the cone area for even more bass. Make sure you check the resulting total impedance in ohms and that your power amplifier can deliver the necessary power.

What is the maximum excursion of the Sundown?

The X18 v4 offers an impressive high excursion of over 30 mm on one side. This extreme range of movement enables tremendous sound pressure at low frequencies with astonishingly low distortion.

What makes the Sundown Audio X18’s motor structure so special?

The solid 190mm magnet and the optimised voice coil ensure precise control even under peak loads. The advanced motor design guarantees minimal distortion even at extreme volume levels.

How long does the X18 v4 last under continuous use?

When installed correctly and with adequate ventilation, the Sundown is designed for years of continuous operation. Its robust construction, using high-quality materials, makes it a reliable choice for discerning bass enthusiasts.

Sundown X18 v4 - Here's what our expert has to say

The Sundown X18 v4 proves that true bass power only makes an impression when it remains under control – and that’s exactly what it’s built for.