JL Audio CF-350mt Custom-fit 3-1/2″ midrange/mid-tweeter speakers

Two-way Component System: 6.5″ (165 mm) Woofer, 1″ (25 mm) Silk Dome Tweeter

Born from shared technologies used in our flagship C7 speakers, the C6-650 component system combines the smoothness and transparency of a premium silk dome tweeter with a top-flight component woofer to create a loudspeaker system with exceptional refinement and dynamic capability.

Benefiting from vast woofer design experience and advanced modeling systems of JL Audio, the 6.5 inch (165 mm) C6 component woofers feature purpose-engineered, cast alloy frames outfitted with our Elevated Frame Cooling technology. A DMA-optimized, forged and machined motor system generates outstanding midbass impact with ultra-low distortion.

The 1″ (25 mm) C6 component tweeters feature edge-driven pure silk dome diaphragms for smooth high-frequency performance with remarkable off-axis response and damping. Neodymium motors and ferrofluid cooling provide high-magnetic flux and improved reliability with extended response from a very compact motor system. Surface- and flush-mount fixtures are included to fit a wide variety of installation applications.

Premium passive crossover networks are included with each C6-650 component system. Featuring four levels of tweeter adjustment, these outboard filter networks are equipped with premium polyester film and electrolytic capacitors as well as low-loss air-core inductors — all accessible beneath a protective, polycarbonate cover. Each C6 passive crossover also includes an advanced electronic tweeter protection circuit designed to minimize the possibility of tweeter failure.

C6 Woofer Features:
• Forged and machined motor plates with DMA-optimized geometries to create linear motor force under power, leading to outstanding midbass impact, linearity and low distortion
• Large diameter, linear profile, flat spider for linear compliance and outstanding excursion capability
• Center cap designed to optimize the high-frequency response of the woofer for seamless transition to a tweeter’s response
• Oversized voice coil for extended power handling capability, minimizing thermal compression and distortion at higher listening levels
• Cast alloy frame with our Elevated Frame Cooling feature
• Includes fine mesh grilles

C6 Tweeter Features:
• Edge-driven pure silk dome design delivers smooth high-frequency performance, with excellent off-axis response and damping
• Neodymium motor delivers high magnetic flux from a compact motor design
• Ferrofluid cooling and damping improves reliability and response smoothness
• Includes surface- and flush-mount fixtures

Woofer grilles are included, each consisting of a black grille tray and a fine steel mesh grille with an electroformed JL Audio badge logo.

Speakers are sold as a pair.

1-inch (25 mm) Corundum Ceramic-Coated, Aluminum Dome Component Tweeter

C7 is the pinnacle of JL Audio automotive loudspeaker design, benefiting from our most advanced development tools and a complete commitment to precision manufacturing.

The C7-100ct component tweeter is designed to deliver unparalleled high-frequency performance. Utilizing a corundum ceramic-coated aluminum alloy diaphragm suspended via a treated silk, s-roll surround, it provides spectacularly detailed reproduction of treble frequencies with outstanding off-axis response. Distortion and non-linearities have been minimized through critical optimization of dynamic motor and suspension behaviors.

Passive crossover networks are not included with C7 drivers, as they are designed for active systems. Instead, we recommend a high-quality tuning DSP, such as the JL Audio TwK 88 or D8, or a VXi amplifier with built-in DSP, with a dedicated amplifier channel for each C7 loudspeaker in the system. Precise setup of equalization, delay and crossover filters will ensure optimal in-vehicle performance.

C7-100ct Design Notes:
Dome Diaphragm: Corundum ceramic coated aluminum alloy diaphragm exhibits high stiffness, very low mass and excellent environmental stability. It also helps the tweeter dome to hold its shape and operate as a true piston at higher frequencies, without a penalty in moving mass.

Suspension Design: The diaphragm’s motion is centered, sprung and damped by a treated silk, s-roll surround. Ferrofluid in the magnetic gap acts as a rear suspension element in this design. The two combine to provide optimum damping without unduly restricting excursion.

Motor Design: The C7-100ct employs a high-density magnetic circuit with a neodymium magnet and U-Yoke motor topology. An under-hung voice coil is employed, wound with copper-clad aluminum wire onto an aluminum voice coil former. Motor magnetics have been precisely optimized utilizing advanced FEA tools to lower even order distortion and IMD/AMD.

Acoustical Design: The shape of the tweeter housing is designed to boost sensitivity in a very specific bandwidth, helping to flatten the frequency response. It also provides improved control of directivity.

Design Bandwidth:
With 48 dB/octave filters: 3,000 Hz – 30,000 Hz
With 24 dB/octave filters: 4,000 Hz – 30,000 Hz
With 12 dB/octave filters: 5,000 Hz – 30,000 Hz

Sold individually, with flush and surface mounting fixtures and hardware. One 15μF tweeter protection capacitor is also included.

The performance of every C7 driver is tested and verified, then assigned a unique serial number. Register your C7 loudspeaker online to receive a copy of its specific Acoustical Test Report.