MB Quart MBQ-DK2-168 Discus 5x7 and 6x8" 2-Way Coaxial Car Speakers

MB Quart MBQ-DK2-168 Discus 5x7 and 6x8" 2-Way Coaxial Car Speakers A 5x7 and 6x8" 2-way coaxial car speaker from the MB Quart Discus series, the MBQ-DK2-168 delivers aluminium inverted dome tweeter performance, lightweight polypropylene cone construction, butyl rubber surround, and a pure copper voice coil on a Kapton former at 50W RMS and 100W peak into 4 ohms. Product Overview The MB Quart MBQ-DK2-168 is a 5x7 and 6x8" 2-way coaxial car speaker from the Discus series, designed as a direct upgrade for vehicles with factory 5x7" or 6x8" speaker positions. Covering a frequency response of 46Hz to 20kHz at 88dB sensitivity and 4 ohms impedance, the DK2-168 handles 50W RMS and 100W peak. The aluminium inverted dome tweeter delivers high-frequency detail with increased reliability compared to soft dome alternatives, while the lightweight thermal-formed polypropylene cone provides fast midrange response. A butyl rubber surround delivers durable, long-term cone excursion and deeper mid-bass impact, with a high-temperature adhesive cone and surround connection ensuring separation does not occur under high power or extreme temperature conditions. The pure copper voice coil on a Kapton former creates a strong magnetic field, with the Kapton material providing lightweight and efficient heat dissipation. An over-coil cooling system allows air exchange over the voice coil through the spider for thermal management during sustained use. The natural fibre spider with infused epoxy provides flexibility during excursion with structural strength during manufacturing. A 6dB internal crossover is integrated into the speaker design for smooth midrange to tweeter frequency transitions. Heavy gauge progressive-die stamped steel frames provide structural rigidity, and the ferrite magnet motor is sized to fit a wide range of vehicle applications. Tinsel lead connections support spade connectors or direct solder for reliable signal and power delivery. Features & Benefits Aluminium Inverted Dome Tweeter: The aluminium inverted dome tweeter delivers detailed high-frequency reproduction up to 20kHz with increased reliability over soft dome alternatives, providing clear and extended treble response within the coaxial assembly. Lightweight Thermal-Formed Polypropylene Cone: The cone is manufactured from lightweight thermal-formed polypropylene, enabling faster midrange response and accurate pistonic motion across the DK2-168's operating frequency range. Butyl Rubber Surround with High-Temperature Adhesive Bond: The butyl rubber surround provides long-term durability, controlled cone excursion, and deeper mid-bass impact compared to foam surrounds. The cone and surround connection uses a high-temperature adhesive to prevent separation during high power use or in extreme weather conditions. Pure Copper Voice Coil on Kapton Former: The pure copper voice coil creates a strong magnetic field with a thin extrusion profile. The Kapton voice coil former is lightweight and efficiently dissipates heat during sustained power handling. Over-Coil Cooling System: The over-coil cooling system allows air exchange over the voice coil through the spider, managing thermal buildup during high-power or extended playback sessions. Natural Fibre Spider with Infused Epoxy: The spider uses natural fibre for flexibility during cone excursion, with infused epoxy providing the structural strength required during the manufacturing process and long-term operation. 6dB Internal Crossover: A 6dB internal crossover is integrated into the speaker design, managing frequency distribution between the woofer and aluminium inverted dome tweeter for smooth midrange to tweeter transitions without requiring external crossover components. Heavy Gauge Progressive-Die Stamped Steel Frame: The speaker frame is constructed from heavy gauge steel using a progressive-die stamping process, providing ultimate rigidity for the driver assembly during operation. Ferrite Magnet Motor: The ferrite magnet motor creates a strong magnetic field in a compact form factor, sized to fit a wide range of vehicle door and panel applications where magnet clearance may be restricted. Spade or Solder Connection Options: The DK2-168 supports both spade connector terminations and direct solder connections via highly conductive, flexible tinsel leads for reliable signal and power delivery across installation methods. Technical Specs Specification Detail SKU MBQ-DK2-168 Brand MB Quart Series Discus Colour Black Speaker Type 2-Way Coaxial Speaker Size 5x7" / 6x8" Power Handling - RMS 50W Power Handling - Peak 100W Impedance 4 Ohm Frequency Response 46Hz - 20kHz Sensitivity 88dB Crossover Slope 12dB/Octave Internal Crossover 6dB Mounting Diameter / Cut-Out 5.67" Outside Diameter 8.60 x 5.56" Mounting Depth 2.13" Tweeter Aluminium Inverted Dome Cone Material Lightweight Thermal-Formed Polypropylene Surround Material Butyl Rubber Voice Coil Material Pure Copper Voice Coil Former Kapton Spider Natural Fibre with Infused Epoxy Cooling System Over-Coil Cooling Frame Heavy Gauge Progressive-Die Stamped Steel Magnet Type Ferrite Connectors Spade or Direct Solder (Tinsel Leads) Warranty 2 Years Compatible With The MBQ-DK2-168 is designed as a direct upgrade for vehicles with factory 5x7" or 6x8" speaker positions. The 5.67" mounting cut-out diameter and 2.13" mounting depth suit the standard 5x7" and 6x8" speaker openings found across a range of vehicle door and panel locations. At 4 ohms impedance and 50W RMS, the DK2-168 is compatible with most aftermarket head units and car amplifiers. Verify mounting cut-out dimensions and depth clearance against your specific vehicle before installation. Frequently Asked Questions Is the MBQ-DK2-168 compatible with both 5x7" and 6x8" speaker openings? Yes. The DK2-168 is designed to fit both 5x7" and 6x8" factory speaker openings using the 5.67" mounting cut-out diameter, which is the standard shared cut-out dimension used across both speaker size designations in most vehicle applications. Verify the cut-out and depth dimensions against your specific vehicle before installation. Does the MBQ-DK2-168 require an external crossover? No. The DK2-168 includes an integrated 6dB internal crossover that manages frequency distribution between the woofer and aluminium inverted dome tweeter, allowing straightforward installation without external crossover components. Can the MBQ-DK2-168 be driven directly from a head unit without an amplifier? Yes. With 88dB sensitivity and a 50W RMS rating at 4 ohms, the DK2-168 is compatible with head unit outputs typically in the 18-50W per channel range. For higher output, an external amplifier matched to the speaker's 50W RMS and 100W peak ratings at 4 ohms is recommended. What is the purpose of the over-coil cooling system? The over-coil cooling system allows air to circulate over the voice coil through the spider during operation, dissipating heat generated by the voice coil during sustained or high-power playback. This thermal management helps maintain performance and extend the lifespan of the voice coil assembly. What connection types does the MBQ-DK2-168 support? The DK2-168 supports both spade connector terminations and direct solder connections via the tinsel leads. Both methods provide reliable signal and power delivery; spade connectors allow easier removal during servicing, while direct solder provides the lowest-resistance permanent connection.