Mercedes W177 Speaker D Pillar Rear Left Right N/O/S Speaker Premium A2478201400

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W177 Speaker D Pillar Rear Left Right N/O/S Speaker Premium is an original audio system component designed for installation in the rear section of the vehicle body. Specifically engineered for the W177 architecture, it ensures consistent sound quality with other drivers and stable operation within the factory sound system. This is a practical solution for users who want to maintain full compatibility with the electrical installation and interior acoustics.

Specifications and technical data

• SKU: A2478201400-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2478201400
• Substitutable numbers: A2478201400, A 247 820 14 00
• Location on the vehicle: Rear, Right, Left
• Category: Other Interior Parts & Accessories

Purpose and vehicle placement

The presented speaker is intended for installation in the rear part of the body, in the D-pillar area, on either the left or right side. This placement allows for effective completion of the soundstage in the rear cabin area, without interfering with factory mounts or wiring harnesses. The component has been designed for specific mounting points, which facilitates service and reduces the risk of improper seating.

Technical characteristics and audio system integration

The D-pillar speaker in the premium version for the W177 is a construction optimized for operation within the standard Mercedes sound system. The acoustic solutions applied are tailored to the volume of the mounting cavity and the interior characteristics, which translates into a consistent, predictable sound. The component works with the factory wiring and audio control unit, ensuring stable impedance and correct amplifier load.

Such a match reduces the risk of interference, unwanted resonances, and issues with multimedia system diagnostics. In practice, this means the possibility of replacement without the need for installation modifications, coding, or the use of additional adapters.

Benefits of using an original speaker

Using the original D-pillar speaker in the Mercedes W177 allows for maintaining the acoustic consistency of the entire audio system. Compared to replacements, this component offers:

• factory fitment to the shape of the pillar and upholstery,
• predictable operating parameters within the sound system,
• no need for electrical installation modifications,
• easier diagnostics in case of potential audio faults.

For users who care about maintaining the original vehicle configuration, this is a particularly beneficial solution – both in terms of technical aspects and the future resale of the car. Consistency of audio components is significant when the vehicle's condition is assessed by service centers and potential buyers.

Component condition and service application

The offered speaker is a component removed from a vehicle, making it an attractive option for post-accident repairs, replacing damaged drivers, or restoring full functionality of the sound system after upholstery interventions. The used OEM component allows for cost reduction in service while maintaining proper fitment for the specific model.

This type of solution will work well both in workshops specializing in the brand and for users servicing their own cars who expect compatibility with factory mounts and harnesses without additional modifications.

Further knowledge and related products

If you are planning a comprehensive repair or upgrade of the rear interior area in your Mercedes and need other elements from the same group, such as additional speakers, grilles, or modules related to the sound system, check out the available parts in the Other Mercedes category.

If you are interested in comparing technical solutions used in sports versions of cars, including differences in drivetrain and braking systems, our blog article may be helpful: Audi RS vs other models – what is hidden under the hood and chassis?.