JL Audio C7-650CW - 16,5cm Tiefmitteltöner

C7-650cw
6.5-inch (165 mm) Component Woofer, with Grille

• 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 C7-650cw component woofer is capable of operating in a 3-way system, with a midrange and tweeter, or with only a tweeter in a 2-way configuration. Engineered from the ground up, it has exceptional linear excursion capability and outstanding linearity, resulting in solid mid-bass and pure, precise, mid-range performance. 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, and 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.
• C7-650cw 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 specially shaped dust cap attaches to the cone body and the voice coil former to improve high frequency behavior.
• Suspension design: The moving assembly is suspended and damped via a large-diameter, 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 the C7-650cw's outstanding excursion capability.
• Motor Design: The C7-650cw employs a high-density magnetic circuit with a high-grade Y35 Strontium-ferrite magnet, and a specially machined, T-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 32 mm (1.27 inch) diameter, overhung voice coil is employed, wound with copper 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, and our Patented Elevated Frame Cooling technology.
• Design Bandwidth:
• With 48 dB/octave filters: 50 Hz - 5 kHz
• With 24 dB/octave filters: 60 Hz - 5 kHz
• With 12 dB/octave filters: 70 Hz - 5 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: https://c7.jlaudio.com/index.aspx

General Specifications

• Continuous Power Handling (RMS): 125 W
• Peak Music Power: 225 W
• Recommended Amplifier Power (RMS): 50 - 175 W / Ch.
• Nominal Impedance: 4 ohms
• Frequency Response: 50 Hz - 5 KHz ± 3 dB

Parameters

• Voice Coil Resistance (Re): 3.114 ohms
• Free Air Resonance (Fs): 54.5 Hz
• Reference Efficiency (no): 0.304%
• Efficiency: 87.0 dB at 1W / 1m
•                  93.0 dB at 1W / 0.5m
• Sensitivity: 90.0 dB at 2.83V / 1m
• Electrical “Q” (Qes): 0.669
• Mechanical “Q” (Qms): 6.265
• Total Speaker “Q” (Qts): 0.605
• Equivalent Compliance (Vas): 0.461 cu. ft. (13.05 liters)
• Moving Mass (Mms): 17.679 g
• Mechanical Compliance (Cms): 0.000482 m/N
• Magnetic Strength (BL): 5.31 N/A
• Effective Piston Area (Sd): 21.4 sq. in. (0.013807 sq. m)
• One Way Linear Excursion (Xmax): 5 mm

Woofer Physical Specifications (Pict. 6) 

• Frame Outer Diameter (A): 6.50 in / 165 mm
• Bolt Hole Circle Diameter (B): 6.12 in / 155 mm
• Mounting Hole Diameter (C): 5.56 in / 141 mm
• Grille Tray Outer Diameter (D): 7.20 in / 183 mm
• Frontal Grille Protrusion* (E): 0.98 in / 25 mm
• Mounting Depth (F): 2.77 in / 70 mm
• Motor Outer Diameter (G): 3.94 in / 100 mm

*Frontal grille protrusion measured from mounting surface