JL Audio C7-350cm

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 C7-350cm component midrange is designed to operate in a 3-way system, with a woofer and tweeter. Conceived and purpose-built from the ground up, it offers exceptional transient response and outstanding linearity, resulting in unsurpassed clarity and natural mid-range reproduction. 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.

C7-350cm Design Notes:
Cone and Dust Cap: Vacuum-formed, mineral-filled polypropylene material offers excellent damping and low mass. The cone body features a gentle curvilinear profile to optimize response. A concave dust cap further improves high frequency behavior.

Suspension design: The moving assembly is suspended and damped via a linear profile spider formed from a Nomex®/polycotton blend, and a positive-roll, rubber surround. The two combine to provide optimum damping without prematurely restricting excursion.

Motor Design: The C7-350cm employs a high-density magnetic circuit with a high-grade, neodymium magnet, and a specially machined, U-Yoke motor topology. Motor magnetics have been precisely optimized utilizing advanced FEA tools to reduce distortion and provide linear motor force throughout the driver's performance range.

A 36 mm (1.42 inch) diameter, overhung voice coil is employed, wound with copper-clad aluminum wire onto a fiberglass voice coil former. The oversized voice coil offers extended power handling capability, minimizing thermal compression and distortion at higher listening levels.

Chassis Design: A purpose-engineered cast alloy basket is employed, featuring thin spokes to maximize rear open area.

Design Bandwidth:
With 48 dB/octave filters: 300 Hz - 10 kHz
With 24 dB/octave filters: 400 Hz - 10 kHz
With 12 dB/octave filters: 500 Hz - 10 kHz

Built in USA with Global Components
Sold individually, with a cast-alloy grille tray, one fine mesh steel grille insert and one spiral steel grille insert.

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.

General SpecificationsContinuous Power Handling (RMS)100 WRecommended Amplifier Power (RMS)50 - 150 W / Ch.Nominal Impedance4 ΩFrequency Response300 Hz - 10 KHz ± 3 dB

ParametersVoice Coil Resistance (Re)3.245 ΩFree Air Resonance (Fs)156.9 HzReference Efficiency (no)0.270%Efficiency86.5 dB @ 1W / 1m92.5 dB @ 1W / 0.5mSensitivity89.5 dB @ 2.83V / 1mElectrical “Q” (Qes)0.590Mechanical “Q” (Qms)6.454Total Speaker “Q” (Qts)0.541Equivalent Compliance (Vas)0.015 cu. ft. (0.430 liters)Moving Mass (Mms)4.009 gMechanical Compliance (Cms)0.000257 m/NMagnetic Strength (BL)4.66 N/AEffective Piston Area (Sd)5.31 sq. in. (0.003426 sq. m)One Way Linear Excursion (Xmax)1 mm

Midrange Physical SpecificationsFrame Outer Diameter (A)3.45 in / 88 mmBolt Hole Circle Diameter (B)3.15 in / 80 mmMounting Hole Diameter (C)2.87 in / 73 mmGrille Tray Outer Diameter (D)3.95 in / 100 mmFrontal Grille Protrusion (E)0.58 in / 15 mmMounting Depth (F)1.46 in / 37 mmMotor Outer Diameter (G)2.36 in / 60 mm