RK1-168

Reference Series Sound Built for Clarity and Impact

The MB Quart RK1-168 Reference Series 5x7–6x8 Inch 2-Way Coaxial Car Speakers are engineered to deliver premium sound quality with exceptional clarity and dynamic range. Designed for audiophiles and everyday drivers alike, these speakers provide a balanced blend of crisp highs, detailed midrange, and controlled bass performance.

With 200 watts of peak power handling per system and a refined acoustic design, the RK1-168 speakers bring your favorite music to life with improved sound staging and accuracy. Whether you're upgrading factory speakers or building a custom audio system, the Reference Series ensures a noticeable improvement in overall sound quality.

Titanium Dome Tweeters with WideSphere Soundstage

Each RK1-168 speaker features a 0.75-inch titanium dome tweeter equipped with WideSphere Technology, designed to expand the perceived soundstage inside your vehicle. This allows high frequencies to be distributed more evenly, creating a more immersive and concert-like listening experience.

Paired with a built-in audiophile-grade crossover network, the tweeter and woofer operate in perfect harmony, ensuring smooth frequency transitions with minimal distortion. Tight tolerance components in the crossover enhance precision, making vocals, instruments, and high-frequency details sound more natural and refined.

Engineered Durability and Precision Fit Design

MB Quart engineered the RK1-168 Reference Series with durability and real-world driving conditions in mind. Lightweight curvilinear cone design improves bass response while preventing cone flexing, ensuring clean and distortion-free sound even at higher volumes.

High-temperature adhesives maintain structural integrity under extreme heat and cold, while molded polymer sealing gaskets help protect the speaker from dust and moisture intrusion. A red woven fiber cotton poly blend spider stabilizes the cone and voice coil, and integrated venting improves airflow for better thermal performance and long-term reliability.

Designed for 5x7 and 6x8-inch factory openings, these speakers provide an OEM-friendly fit for a wide range of vehicles.

Product Highlights

• 5x7–6x8 inch Reference Series 2-way coaxial speakers
• 200 watts peak power handling (system)
• 100 watts peak per speaker / 50 watts RMS per speaker
• 4-ohm impedance for wide amplifier compatibility
• 0.75-inch titanium dome tweeters
• WideSphere Technology for expanded soundstage
• Built-in audiophile-grade crossover network
• Tight-tolerance crossover components for accuracy
• Curvilinear cone design for improved bass response
• Reduced cone flexing for cleaner sound output
• High-temperature adhesive construction for durability
• Molded polymer sealing gaskets for protection
• Red woven fiber cotton poly blend spider for stability
• Integrated venting for improved cooling and airflow
• Designed for OEM replacement fit (5x7–6x8 slots)
• Balanced full-range audio reproduction
• Enhanced vocal clarity and instrument separation
• Suitable for factory or custom audio upgrades

Package Contains

• 2 × MB Quart RK1-168 Reference 5x7–6x8 Inch Coaxial Speakers
• 2 × Speaker Grilles (if included by manufacturer)
• Mounting Hardware Kit
• Installation Instructions / Owner’s Manual
• Manufacturer Documentation