JL Audio Single 6.5" Component Woofer - 99757

JL Audio 99757 Single 6.5" Component Woofer

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.

Specifications:

General Specifications

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

Parameters

• Voice Coil Resistance (Re): 3.114 Ù
• Free Air Resonance (Fs): 54.5 Hz
• Reference Efficiency (no): 0.304%
• Efficiency:
  • 87.0 dB @ 1W / 1m
  • 93.0 dB @ 1W / 0.5m
• Sensitivity: 90.0 dB @ 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