JL Audio C7-350cm User Manual
OWNER’S MANUAL
3.50-inch (90 mm) Component Midrange
C7-350cm: 3.5-inch (90 mm) Component Midrange
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INTRODUCTION
Thank you for choosing JL Audio C7 loudspeakers
for your automotive sound system. C7 is the
pinnacle of JL Audio loudspeaker design, benefitting
from patented technologies and our most advanced
development tools.
The C7-350cm is a component midrange
designed to operate in a 3-way system, with a
woofer and tweeter. 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.
We do not recommend the use of passive
crossover networks with C7 loudspeakers. Instead,
we recommend a high-quality tuning DSP 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.
Should you have any questions regarding the
instructions in this manual, please contact your
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authorized JL Audio dealer for assistance, or contact
the JL Audio Technical Support Department.
INCLUDED COMPONENT & PARTS
• One (1) C7-350cm 3.50-inch (190 mm) midrange
• One (1) die-cast aluminum grille tray
• One (1) fine mesh steel grille
• One (1) spiral steel grille
• One (1) 4.7 mm female crimpable connector
• One (1) 2.8 mm female crimpable connector
• Four (4) #6 x 1.25-inch (32 mm) sheet metal screws
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DESIGN & TECHNOLOGIES
Cone and Dust Cap:
Vacuum-formed, mineral-filled polypropylene
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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
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frequency behavior.
Suspension Design:
The moving assembly is suspended and
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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 the C7-350cm’s excursion capability.
Motor Design:
The C7-350cm employs a high-density magnetic
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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
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voice coil is employed, wound with copperclad 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
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employed, featuring thin spokes to maximize
rear open area, and our Patented Elevated
Frame Cooling technology.
Built in USA with Global Components
C7-350cm: Specifications and Crossover Setting Guidelines
dB SPL
C7350cm SPECIFICATIONS
Speaker Type: Component Midrange
Nominal Diameter: 3.5 in. (90 mm)
Nominal Impedance (Znom): 4 ohms
Continuous Power Handling: 100W
Recommended Amplifier Power: 50-150W (RMS)
Net Weight: 0.71 lbs. (0.32 kg)
Driver Rear Displacement: 0.0024 cu.ft. (0. 068 liters)
Min. Recommended Sealed Enclosure:
0.014 cu.ft. (0.4 liters)
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Tweeter
MidrangeWoofer
Parameters:
Voice Coil Resistance (Re): 3.245 ohm s
Free Air Resonance (Fs): 156.9 Hz
Reference Efficiency (no): 0.270%
Efficiency: 86. 5 dB @ 1W/1m | 92.5 dB @ 1W/ 0.5m
Sensitivity: 89.5 dB @ 2. 83V/1m
Electrical “Q” (Qes): 0.590
Mechanical “Q” (Qms): 6.454
Total Speake r “Q” (Qts): 0. 541
Equivalent Compliance (Vas): 0.015 cu.ft. (0.430 liters)
Moving Mass (Mms): 4.009 g
Mechanical Compliance (Cms): 0.000257 m/N
Magnetic Strength (BL): 4.66 N/A
Effective Piston Area (Sd): 5.31s q.in. (0.003426 sq. m)
One-Way Linear Excursion (Xmax): 1 mm
Design Bandwidth:
With 48 dB/oc tave filters: 300 Hz - 10 kHz
With 24 dB/octave f ilters: 400 Hz - 10 kHz
With 12 dB/octave filters: 500 H z - 10 k Hz
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C7 3-Way Speaker System
Low-Pass: 24 dB/octave Linkwitz-Riley @ 400 Hz
High-Pass: 24 dB/octave Linkwitz-Riley @ 480 Hz
Low-Pass: 24 dB/octave Linkwitz-Riley @ 3500 Hz
High-Pass: 24 dB/octave Linkwitz-Riley @ 4500 Hz
Please note: These are recommended starting points
for tuning. In-vehicle measurements should be made
to optimize the crossover for speaker placement
and vehicle acoustics.
C7-650cw Woofer
Level Offset: 0 dB
C7-350cm Midrange
Level Offset: 0 dB
C7-100ct Tweeter
Level Offset: -1.0 dB
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