MB Quart XK2-168 5x7/6x8-Inch Coaxial Speakers

The MB Quart XK2-168 is a pair of 5x7/6x8-inch two-way coaxial car speakers designed for replacing compatible factory door speakers. Its dual-size fit is intended to help simplify upgrades in vehicles that use either 5x7-inch or 6x8-inch speaker openings. The system is suited to drivers seeking a straightforward full-range speaker upgrade without moving to a separate-component design.

Rated at 100 watts RMS and 200 watts peak power per pair, the XK2-168 is designed to work with an appropriately matched car-audio system. The published 55Hz-22kHz frequency response covers bass, midrange, and high-frequency content within a single coaxial assembly. An 88dB sensitivity rating provides a useful reference point when matching the speakers with a head unit or external amplifier.

This is a two-way coaxial speaker system, meaning its drivers are integrated into each speaker assembly. That layout keeps the installation focused on replacing a compatible existing speaker location rather than adding separate tweeter mounting positions. It can be a practical choice for door-speaker upgrades where space and installation simplicity matter.

The XK2-168 is specified for both 5x7-inch and 6x8-inch openings, giving it flexibility across compatible vehicle applications. Its published 5.67-inch cutout diameter and 2.13-inch mounting depth from the flange should be checked against the vehicle's available opening and window clearance before installation. Confirming these dimensions in advance helps avoid fitment issues behind the door panel.

For a balanced upgrade, pair the speakers with a source unit or amplifier whose power delivery is appropriate for the 100-watt RMS-per-pair rating. They are intended for wired car-audio use and can serve as replacements for factory speakers in compatible locations. Vehicle-specific mounting adapters, harnesses, or hardware may be needed depending on the factory installation.

Key Features

• Dual-Size Fit: Fits compatible 5x7-inch and 6x8-inch speaker openings.
• Two-Way Coaxial Design: Integrates drivers into each speaker assembly.
• 100W RMS Per Pair: Supports appropriately matched car-audio power.
• 200W Peak Per Pair: Provides published short-term peak handling.
• 55Hz-22kHz Response: Covers a wide published frequency range.
• Compact Mounting Profile: Uses a 5.67-inch cutout and 2.13-inch depth.

Design & Installation

The XK2-168 uses a coaxial layout in a compact 5x7/6x8-inch form factor. Published product information describes the speakers as built with high-quality materials, but does not identify the cone, surround, tweeter, magnet, or voice-coil materials. The design is intended for durable use in a vehicle audio installation.

Before ordering, compare the vehicle's factory speaker opening, cutout clearance, and available mounting depth with the published 5.67-inch cutout diameter and 2.13-inch depth from the flange. Use compatible vehicle-specific brackets or wiring adapters when required by the factory door location. Match the system's amplification appropriately and follow the vehicle and audio equipment installation instructions.