JL Audio Single 3.5" Component Midrange Speaker (Each) - 99758

JL Audio 99758 Single 3.5" Component Midrange Speaker (Each)

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, 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.

C7-350cm 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

Features:

• Dynamic Motor Analysis - DMA Optimized Motor
  JL Audio's proprietary Dynamic Motor Analysis system is a powerful suite of FEA-based modeling systems, first developed by JL Audio in 1997 and refined over the years to scientifically address the issue of speaker motor linearity. This leads to vastly reduced distortion and faithfully reproduced transients... or put simply: tight, clean, articulate bass.
• Elevated Frame Cooling
  JL Audio's Elevated Frame Cooling design delivers cool air through slots directly above the top-plate to the voice coil of the speaker. This not only enhances power handling, but also sound quality by minimizing dynamic parameter shifts and power compression.

Specifications:

General

• Continuous Power Handling (RMS): 100 W
• Peak Music Power: 200 W
• Recommended Amplifier Power (RMS): 50 - 150 W / Ch.
• Nominal Impedance: 4 Ù
• Frequency Response: 300 Hz - 10 KHz ± 3 dB

Parameters

• Moving Mass (Mms): 4.009 g
• Equivalent Compliance (Vas): 0.015 cu. ft. (0.430 liters)
• Mechanical Compliance (Cms): 0.000257 m/N
• Magnetic Strength (BL): 4.66 N/A
• One Way Linear Excursion (Xmax): 1 mm
• Effective Piston Area (Sd): 5.31 sq. in. (0.003426 sq. m)
• Total Speaker “Q” (Qts): 0.541
• Mechanical “Q” (Qms): 6.454
• Reference Efficiency (no): 0.27%
• Free Air Resonance (Fs): 156.9 Hz
• Efficiency:
  • 86.5 dB @ 1W / 1m
  • 92.5 dB @ 1W / 0.5m
• Sensitivity: 89.5 dB @ 2.83V / 1m
• Electrical “Q” (Qes): 0.59
• Voice Coil Resistance (Re): 3.245 Ù