FKB108

Formula Series Compact High-Performance Sound

The MB Quart FKB108 Formula Series 3.5-Inch 2-Way Coaxial Speakers are engineered to deliver impressive clarity and balanced sound from a compact speaker design. Perfect for tight factory locations or custom installations, these speakers provide an excellent upgrade over stock audio systems with improved detail, tonal balance, and overall sound quality.

Despite their small size, the FKB108 speakers are designed to produce clean, distortion-free audio with strong vocal presence and accurate midrange reproduction. They are ideal for enhancing dash or rear-fill speaker locations in a full car audio system.

WideSphere Technology and Aluminum Dome Tweeters

MB Quart’s WideSphere technology ensures a broader sound dispersion, creating a larger “sweet spot” so listeners experience consistent audio quality throughout the cabin. This makes even small 3.5-inch speakers capable of delivering an immersive listening experience.

The aluminum dome tweeters provide extended high-frequency response with high output and natural sound reproduction. Combined with precision tuning, they deliver crisp highs and enhanced musical detail without harshness, making vocals and instruments sound more realistic and engaging.

Durable Build with Reliable Audio Components

Built for long-term performance, the FKB108 features butyl rubber surrounds that enhance durability while improving mid-bass response. This design allows the speaker cone to move more efficiently, producing deeper and more controlled low frequencies despite the compact size.

A textured ABS gasket ensures a secure and rigid seal to the mounting surface, reducing unwanted vibration and improving overall sound accuracy. Inside, a pure copper voice coil generates a strong magnetic field for efficient power handling and precise audio response, ensuring consistent performance over time.

Product Highlights

• 3.5-inch Formula Series 2-way coaxial speakers
• Compact design ideal for dash or rear-fill locations
• Peak power handling: 70 watts per speaker
• RMS power handling: 35 watts per speaker
• WideSphere technology for expanded listening sweet spot
• Aluminum dome tweeters for clear high-frequency response
• Extended frequency range with natural sound reproduction
• Butyl rubber surrounds for durability and improved bass
• Enhanced mid-bass performance for small speaker size
• Textured ABS gasket for tight mounting seal
• Reduced vibration for cleaner audio output
• Pure copper voice coil for strong magnetic efficiency
• Improved vocal clarity and instrument separation
• Ideal factory replacement for small speaker locations
• Balanced sound performance in compact form factor

Package Contains

• 2 × MB Quart FKB108 3.5-Inch Coaxial Speakers
• 2 × Speaker Grilles (if included by manufacturer)
• Mounting Hardware Kit
• Installation Instructions / User Manual
• Manufacturer Documentation