Hyundai IONIQ 9 Soundproofing Review: Cost & Results

Upgrading Your Hyundai IONIQ 9: S-Closing and Door Soundproofing

For Hyundai IONIQ 9 owners seeking an enhanced driving experience, combining S-closing (soft-close doors) with door soundproofing offers a significant upgrade in both convenience and cabin tranquility. This review delves into the specifics of this dual service, drawing from real-world installations to provide a clear picture of what to expect. The S-closing system automates the door closing process, ensuring a smooth, effortless shut, while door soundproofing tackles unwanted road and wind noise, creating a more serene interior environment. This particular installation was performed in Korea, offering a glimpse into the process and its outcomes.

The S-Closing and Soundproofing Process

The installation begins with the careful removal of the door trims. To prevent any scratches, especially around delicate areas like the pop-up door components, meticulous masking is applied. Once the door trims and inner panels are detached, the bare metal of the door is exposed. This is where the soundproofing begins. Vibration-damping pads are applied comprehensively to the metal surface to absorb noise and vibrations. Simultaneously, the S-closing system is integrated. This involves precisely mounting a specialized bracket and motor designed to automatically pull the door shut once it's within a certain range. The system uses a motor and sensors that engage when the door isn't fully latched, drawing it closed smoothly.

After the initial soundproofing and S-closing bracket installation, the process continues with further refinement. Additional sound-damping material is applied to areas prone to significant vibration to maximize effectiveness. The inner panel is then reassembled. For enhanced soundproofing, a thicker, high-quality sound-absorbing material (often referred to as 'shinshull' in Korean contexts, similar to mass-loaded vinyl or acoustic foam) is added to the inside of the door trim. This material is securely attached using ultrasonic welding, a clean method that avoids the use of adhesives and their associated odors, ensuring a durable and effective sound barrier.

Benefits and Considerations

The most immediate benefit of the S-closing feature is the elimination of the need to forcefully slam or push heavy SUV doors. A gentle push is all that's required for the system to take over and close the door completely and quietly. This adds a touch of luxury and convenience to daily use. The door soundproofing, by reducing wind noise (a common issue in larger vehicles) and road noise, significantly lowers the overall cabin noise level. This makes conversations easier, reduces driver fatigue on long journeys, and enhances the overall premium feel of the Hyundai IONIQ 9. While the exact cost in USD can vary, similar installations in Korea typically range from the equivalent of $40–$80 per door, depending on the materials used and the complexity of the S-closing system integration. Durability is generally high, as the components are designed for automotive use, and maintenance typically involves no more than keeping the door mechanisms clean.

Installation Process:

1. Careful removal of door trims with protective masking.
2. Application of sound-damping pads to the door's inner metal panel.
3. Precise mounting of the S-closing system's bracket and motor.
4. Addition of thicker sound-absorbing material to the door trim, secured with ultrasonic welding.

The result is a seamless integration where the exterior appearance remains stock, but the interior experience is noticeably quieter and more refined. For IONIQ 9 owners who value a peaceful cabin and appreciate the convenience of soft-close doors, this combined service offers a compelling upgrade.