JL Audio C2-350X 3.5″ 2-Way Coaxial Speakers – Pair – #99611

Model Number: C2-350X
UPC: 699440996112
JL Audio
Model Number: C2-350X
UPC: 699440996112

JL Audio C2-350X #99611 – 3.5″ Co-Axial Speakers – Pair

  • Injection-molded mica-filled polypropylene woofer with polyether foam surround
  • 3/4″ silk dome tweeter
  • Built-in crossover network
  • Handles up to 25 watts RMS (75 watts peak power)
  • Frequency response: 130-22,000 Hz






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Availability: In stock

Product Description

Features & Specifications



JL Audio C2-350X #99611 – 3.5″ Co-Axial Speakers – Pair

JL Audio C2-350X speaker deliver an impressive audio performance solution and value. The technology of the Evolution C2 Series has been drawn from JL Audio’s experience in woofer and tweeter design. They have been engineered to deliver adequate efficiency while retaining a smooth mid-range response with low-frequency extension. Smoothness of response and the freedom from distortion are factors that make the C2 Series speakers truly one of a kind and enjoyable for everyone, and the resulting product is one that delivers performance for any car audio enthusiast at a price that won’t break the bank!

The C2-350x system features 3.5-inch (90 mm) woofers with mineral-filled polypropylene cones, long excursion capabilities and stamped steel frames. The woofer design benefits from JL Audio’s vast woofer design experience and advanced modeling systems. Tweeters are coaxially mounted and built with 0.75-inch silk dome diaphragms that deliver smooth, extended response, on and off axis.

Silk Dome Tweeter

JL Audio  C2-350X tweeters incorporate silk dome diaphragms to deliver smooth high-frequency transitions, on and off axis. Silk is a natural material with inherently good characteristics as a tweeter diaphragm. In addition to being very light in weight, silk exhibits excellent damping properties, which reduces ringing and resonances in the tweeter’s passband, leading to a smooth, pleasing high frequency character free from unnatural sibilance or exaggerated brightness. This is why a Silk Dome Tweeter is preferred by many audiophiles for its overall balance.

JL Audio Quality, Build and Design

JL Audio Evolution C2 coaxial speaker systems feature mineral-filled polypropylene cones, long excursion capabilities and stamped steel frames. In addition, the woofer design benefits from JL Audio’s vast woofer design experience and advanced modeling systems. It is this use of proper high-quality components and advances that allow the speaker to perform better than any other speaker in its price range. The C2-350x, specifically, has a respectable frequency response of 130 Hz – 22,000 Hz, a modest continuous-power handling of 25 watts and a solid efficiency of 83.0 dB, giving it the ability to produce smooth mid-range and highs.

The JL Audio C2-350X 3-1/2″ speakers feature rugged polypropylene cones that can handle plenty of power without distortion, so you get full-bodied tones. The 3/4″ silk dome tweeters serve up smooth-sounding high frequencies that won’t tax your ears, adding a satisfying dose of realism to your soundstage. Built-in crossovers ensure that the tweeters and woofers reproduce only the frequencies that they were designed to handle, so your tunes play smoothly across the whole musical spectrum. Grilles are not included — factory grilles are appropriate for most installations.

Lineart Bottom-View and Side-View of C2-350x Coaxial Midrange with dimension labels A-G

Frame Outer Diameter* (A) 3.44 in / 87 mm
Grille Tray Outer Diameter (B) N/A
Motor Outer Diameter (C) 2.36 in / 60 mm
Frontal Coaxial Tweeter Protrusion** (D) 0.54 in / 14 mm
Frontal Grille Protrusion (E) N/A
Mounting Hole Diameter (F) 3.19 in / 81 mm
Mounting Depth (G) 1.50 in / 38 mm


Woofers: The JL Audio Evolution C2-350x coaxial speakers feature a 3½ injection-molded, mica-filled polypropylene cone woofer with a polyether foam surround. The woofer features a 0.75″ voice coil on a Kapton Former, a symmetrical roll spider and a Ferrite magnet. These carefully engineered cones deliver the right combination of stiffness, damping, and off-axis response. The speaker also provides good mid-bass (by 3½ standards), thanks to its mechanical clearance, optimized suspension and balanced motor design.

Tweeters: Each C2-350x features a ¾” silk dome, ferrofluid-cooled tweeter with a damping neodymium magnet. The edge-driven silk dome tweeter is smooth, detailed (on or off axis), and provides great overall performance. Silk is lightweight and great for high frequency extension and efficiency. It is also designed for durability in the extreme automotive environment.

Power Handling: JL Audio publishes several power specifications for this speaker, 25 watts continuous power handling (RMS), 75 watts peak music power, and 10-40 watts recommended amplifier power (RMS). We’ve listed the conservative combination of 10-25 watts RMS in the specs table.

Model C2-350X
Model: C2-350X
Product: JL Audio C2-350X 3.5″ 2-Way Coaxial Speakers – Pair – #99611

Speaker Size: 3 1/2
Design: 2-way
Tweeter Design: Dome
Impedance (Ohms): 4
Tweeter Composition: Silk
Woofer Composition: Mica-filled Polypropylene
Woofer Surround: Polyether Foam
Sensitivity (1W at 1 meter): 83
Sensitivity at 2.83 volts: 86
Frequency Response: 130 – 22k Hz
Minimum RMS Wattage: 10
Maximum RMS Wattage: 25
Peak Power Handling (Watts): 75
Top-mount Depth (Inches): 1 9/16
Bottom-mount Depth (Inches): 1 11/16
Cutout Diameter or Length (inches): 3 3/16
Mounting Height (Inches): 0.562


4 Ω

RMS Power

Up to 35 Watts

Speaker Design

2-Way, Coaxial

Speaker Sensitivity

81 – 85 db

Speaker Size


Tweeter Size

0.75" – .99"

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JL Audio 1 Year Limited Warranty


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