JL Audio – Ahead Of The Curve
Founded in 1975 by James Birch and Lucio Proni, hence the name; JL Audio has since become synonymous with the design and manufacture of superb quality car, marine and home audio components. Though famous for its innovative subwoofer designs and unique subsonic methodology, the JL Audio stable has grown over the years to encompass everything from the speakers and subwoofers right through to processors, amplifiers and even combinations of the latter. In a nutshell, when talking audio and electronics there’s simply nothing JL Audio cannot accomplish.

C7 Series – The Ultimate In Automotive Audio Fidelity
When JL Audio’s chief engineer and CEO Lucio Proni opted to raise the bar to the highest level he had one clear mission in mind; to create JL Audio’s finest automotive component speakers ever. Under his direction and expert tutelage engineering resources were assigned to develop each C7 speaker as a clean-sheet design, optimized for car audio applications. The results are quite simply astounding!

Design Ideologies
Just glancing at the C7 series components one can tell there’s a phenomenon amount of research and development implemented into their design. However it goes much further than that. Between conceptualising, designing, testing and wise material selection these components are beautiful to behold. Let us now explore some of these concepts further.

Analysis And Solutions
C7 design solutions were created and refined using JL Audio’s powerful mechanical and Finite Element Analysis (FEA) modelling systems, including its proprietary Dynamic Motor Analysis (DMA) software. These studies led to innovative motor and suspension solutions, which were key to meeting the C7 design goals for smooth, off-axis response, dynamic stability and low distortion.

No Stone Left Unturned
No detail, material or design element went unexamined in each of the C7 speakers/ From the exotic, corundum ceramic-coated diaphragm of the C7 tweeter to the intricately machined motor plates of the C7 midrange; these all significantly improve linearity. Even seemingly small details were engineered with a great deal of thought, like the way the C7-350cm’s specially engineered lead wires attach to the rear suspension to prevent noise and without damaging the spider material’s integrity. Or The C7-650cw woofer’s dust cap went through ten prototype generations before arriving at the solution that resulted in the smoothest high frequency response and the best mechanical integrity. These details and hundreds of others like them simply had to be perfect, if the design team was to approve them for the C7 drivers.

Zero Technical Compromise
As one would expect the C7 designers sought to avoid technical compromises, this was conducive to the system being designed as active. Because all cars intrinsically require processor, these components are assumed to feature within a processed system which handles the crossing of frequencies. The other advantage of running one channel per speaker is that more head room conducive to better sound quality through higher damping factor, better slew rate and lower distortion.

Aural Results
When installed correctly the result is a spectacular musical presentation, easily exceeding the performance boundaries of typical high-end car audio speaker systems. One listen to the C7 components will reveal a level of resolution, precision and imaging that suspends disbelief; opening a window to an intensely pure audio experience that’ll leave you speechless.

Design Features
JL Audio’s engineering department is at the forefront of research into fundamental loudspeaker behaviour. It’s developed proprietary analysis systems and invested heavily in state-of-the-art manufacturing and testing. This has borne numerous products widely considered as reference standards and has also resulted in many U.S. and International Patents issued for technologies that refine and extend the audio performance envelope. Many of these impressive design techniques can be found within the C7 series drives. So without further ado let’s check out the middle C7 driver; the 3.5″ component midrange.

Middle Frequency Thinking – The Concept
The C7-350cm component midrange is designed to operate in a three-way system, with the 6.5” woofer and 1” tweeter. Conceived and purpose-built from the ground up it offers exceptional transient response and outstanding linearity, resulting in unsurpassed clarity and natural middle range reproduction. Distortion and non-linearities have been minimized through critical optimization of dynamic motor and suspension behaviours.

Distributing Air Accurately – The Cone
Talking all things cone and dust cap; it’s a 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 behaviour.

Controlling The Movement Accurately – The Suspension
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.

Governing The Reciprocation – The Motor
The C7-350cm employs a high-density magnetic circuit featuring a high-grade neodymium magnet and 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 diameter overhung voice coil is employed, wound with copper-clad aluminium wire on a fiberglass voice coil former. The oversized voice coil offers extended power handling capability, thereby minimizing thermal compression and distortion at higher listening levels.

Rigid Thinking – The Basket
Insofar as the chassis design is concerned; it’s a purpose engineered cast alloy basket that’s been employed, featuring thin spokes to maximize rear open area. The speaker is designed to cover a specific bandwidth depending on what filters you’re employing. So with 48 dB/octave filters the bandwidth is 300 Hz to 10000 Hz, with 24 dB/octave filters its 400 Hz to 10000 Hz and with 12 dB/octave filters it’ll cover 500 Hz to 10000 Hz.

Mounting, Testing And Protecting
The C7-350cm are sold as a pair in Australia with a cast-alloy grille tray, one fine mesh steel grille insert and one spiral steel grille insert. These components are built in America using global components. 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.

Electrical Specifications
– Nominal configuration: one-way 3.5” midrange set
– Continuous power handling: 75 Watts
– Maximum power handling: 150 Watts
– Voice coil diameter: 36 mm
– Frequency response: 300 Hz – 10000 Hz
– Sensitivity: 89.5 dB
– DC resistance (Re): 3.245 Ohms
– Resonant frequency (Fs): 156.9 Hz
– Xmax: +/- 1 mm
– Compliance (Vas): 0.430 l
– Total Q (Qts): 0.541
– Mechanical Q (Qms): 6.454
– Electrical Q (Qes): 0.590

Physical Specifications
– Mounting diameter: 73 mm
– Mounting depth: 37 mm
– Weight: 0.7 kg

Documentation
– User manual

Important Disclaimers
Given the dynamic nature of electronics industries these days; below are listed some very important specifics you need to be aware of.

Brand Authorization And Stock Sourcing
We are a fully authorised Australian dealer of this brand and all stock is sourced through legitimate channels. It therefore enjoys full Australian warranty, backing and support.

Pricing Structure
Whilst we endeavor to offer the best price possible, we ask that if you do find a better price elsewhere from an authorised dealer; please contact us. Also be aware that we regularly conduct group buys and sales, therefore pricing can sometimes be subject to change without notice.

Stock Structure
Being a dynamic store is conducive to our inventory constantly changing. We list only a small portion of our stable online, usually products most popular. Aside from these we also stock numerous other variants and configurations of these products, hence if you don’t see what you’re after please contact us.

Shipping
All our products are shipped with registered and insured postage. Upon ordering you’ll be issued with a receipt, a consignment note via which you can track your order, and we’ll also SMS you photos of the package for identification purposes.

Technical support
This last one we cannot emphasise enough! Please contact us if you require any further information or assistance with the setup and use of this product, especially pertaining to aspects more technical. As we want you to get the very best from this product.