MB Quart RK1-169 6x9" 2-Way Coaxial Speakers

The MB Quart RK1-169 is a pair of 6x9-inch, 2-way coaxial car speakers designed to replace factory speakers or support a custom car-audio upgrade. Its coaxial layout combines the woofer and tweeter in each speaker, helping simplify installation where a 6x9-inch speaker location is available. With 4-ohm impedance, the pair is suited to many aftermarket and compatible factory-powered systems.

These Reference Series speakers use lightweight craft-pulp cones reinforced with bamboo fiber for midrange and bass reproduction. The curvilinear cone profile is intended to add rigidity while helping reduce unwanted cone flex. A butyl-rubber surround supports the woofer assembly during normal operation.

High frequencies are handled by 0.75-inch titanium dome tweeters with MB Quart WideSphere technology. This tweeter design is intended to improve off-axis dispersion, which can be useful in vehicle locations where speakers are not aimed directly at listeners. The result is a full-range coaxial design that covers both low and high frequency duties from one mounting position.

The RK1-169 is rated for 50 watts RMS and 100 watts peak power per speaker, or 100 watts RMS and 200 watts peak power for the pair. Its 85.5 dB sensitivity and 4-ohm impedance should be considered when matching it with a head unit or external amplifier. Use clean power within the stated RMS rating for appropriate power matching.

For a complete system upgrade, these speakers can be used in front or rear 6x9-inch locations where vehicle fitment and clearance permit. The built-in 2-way crossover routes frequencies between the woofer and tweeter without requiring an external passive crossover. Grilles are included for installations where the speakers will be visible or mounted in a custom location.

Key Features

• 6x9-Inch Coaxial Design: Combines woofer and tweeter in each speaker for a straightforward full-range upgrade.
• 50-Watt RMS Per Speaker: Supports amplifier or receiver matching within the stated continuous power rating.
• 0.75-Inch Titanium Tweeters: Reproduce high frequencies with a dome-tweeter design.
• WideSphere Technology: Promotes broader off-axis high-frequency dispersion inside a vehicle.
• Pulp/Bamboo Fiber Cone: Uses a lightweight cone material for bass and midrange reproduction.
• Integrated 2-Way Crossover: Directs frequency ranges to the woofer and tweeter within each speaker.

Design & Installation

The RK1-169 uses a craft-pulp and bamboo-fiber woofer cone with a butyl-rubber surround, a Kapton voice-coil former, and a red woven fiber cotton/poly-blend spider. Its PA66 composite basket is reinforced with 30% glass fiber. Molded polymer sealing gaskets and high-temperature adhesives are also part of the speaker construction.

Confirm vehicle-specific fitment before purchase, including the 8.715 x 5.838-inch cutout requirement and approximately 2 15/16-inch top-mount depth. Observe positive and negative terminal polarity, secure wiring away from moving parts, and verify window or panel clearance before final mounting. The package includes grilles, mounting screws, speed clips, a template, and installation documentation; vehicle-specific harness adapters are not listed.