JL Audio (C1-400x) - 4in (100mm) Coaxial Speaker System,
Pair, 35 Watt RMS, 4 Ohm
Description:
C1-400x Coaxial Speaker System: 4-inch (100 mm) Woofer,
0.75-inch (19 mm) Aluminum Dome Tweeter
C1 speakers deliver real substance and great audio
performance in a format designed for easy fit behind
factory grilles.
To facilitate fit, breakaway mounting tabs on the woofer
frame allow the C1-400x to be installed in four-hole or
two-hole mounting configurations.
C1 woofer drivers benefit from proprietary FEA modeling
and JL Audio's expertise in low-frequency driver
design. This knowledge is used to create speakers that
can play loudly, while maintaining a smooth, dynamic, low
distortion sound. At the core of the C1-400x is a
proprietary, stamped, steel 4-inch (100 mm) frame and a
DMA-optimized motor system. A mineral-filled,
injection-molded polypropylene cone is suspended with a
rubber surround on the front, and a carefully engineered
spider at the top of the voice coil, to precisely control
motion and prevent impact between the voice coil and the
back plate. Tinsel leads are carefully routed and
attached to the spider to prevent fatigue and buzzing.
These are the same kinds of features and materials
normally found on much more expensive loudspeakers.
Equipped with a true, edge-driven, aluminum dome tweeter,
C1 speakers stand further apart from others in its
category with superior high-frequency clarity and
definition. The tweeter's design has inherently
excellent off-axis response and high-frequency extension.
It also benefits from the damping of a silk surround
suspension and Ferrofluid in the voice coil gap, along
with the superior strength of a neodymium magnet circuit.
A true, 2nd order high-pass filter is employed to further
enhance smoothness and improve power handling.
When it comes to value, C1 is the real deal!
Sold as a pair. Grilles not available.
Technology:
DMA Optimized - 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.
Since 1997, JL Audio has been at the forefront of Finite
Element Analysis-based modeling of loudspeaker motors and
suspensions. This research is aimed at decoding what we
refer to as the "Loudspeaker Genome"... a
project aimed at understanding the true behavior of
loudspeakers under power and in motion. A major component
of this integrated system is DMA (Dynamic Motor
Analysis). Starting with the 15W3 and the W7 Subwoofers
in the late 1990's and early 2000's, DMA has
played an important role in the design of all JL Audio
woofers sold today, including JL's component woofers.
DMA is a Finite Element Analysis (FEA)-based system,
meaning that it takes a large, complex problem, breaks it
down into small solution elements for analysis and then
assembles the data to form an accurate,
"big-picture" solution. DMA's breakthrough
is that it actually considers the effects of power
through the coil as well as coil/cone position within the
framework of a time-domain analysis. This gives us a
highly accurate model of a speaker's actual behavior
under real power, something that the traditional
Thiele-Small models or other low power measurements
cannot do. Because DMA does not rely on a steady-state
model, it is able to consider shifts in the circuit
elements being analyzed. These modeling routines are
intense, requiring hours to run for a whole speaker.
DMA is able to analyze the real effects of fluctuating
power and excursion upon the magnetic circuit of the
motor, specifically the dynamic variations of the
"fixed" magnetic field. This delivers intensely
valuable information compared to traditional modeling,
which assumes that the "fixed" field produced
in the air gap by the magnet and the motor plates is
unchanging. DMA not only shows that this
"fixed" field changes in reaction to the
magnetic field created by current flowing through the
voice coil, but it helps their engineers arrive at motor
solutions that minimize this instability. Analyzing this
behavior is critical to understanding the distortion
mechanisms of a speaker motor and sheds light on the
aspects of motor design that determine truly linear
behavior:
- 1. Linear motor force over the speaker's
operational excursion range
- 2. Consistent motor force with both positive and
negative current through the coil
- 3. Consistent motor force at varying applied power
levels
JL's ability to fully analyze these aspects of motor
behavior allows their transducer engineers to make
critical adjustments to motor designs that result in
extremely linear, highly stable dynamic loudspeaker motor
systems.
The payoff is reduced distortion, improved transient
performance and stellar sound quality.
Aluminum Dome Tweeter - Lightweight Aluminum Dome
tweeters deliver sparkling high-frequency detail that
extends well beyond the frequency response of typical
human hearing.
Compared to similar textile designs, aluminum tweeter
diaphragms offer superior stiffness and high-frequency
extension, with only a minor penalty in efficiency. JL
Audio's aluminum dome tweeters employ a rubber
surround and ferrous fluid in the motor gap to damp the
aluminum diaphragm. This additional damping reduces
ringing and improves the tweeter's smoothness of
reproduction while still delivering the high-frequency
energy and extension that metal domes are known for.
JL Audio - Ahead of the curve.
Features and Specifications:
- Coaxial Speaker System: 4-inch (100 mm) Woofer,
0.75-inch (19 mm) Aluminum Dome Tweeter
- Continuous Power Handling (RMS): 35 W
- Peak Music Power: 105 W
- Recommended Amplifier Power (RMS): 10 - 50 W / Ch.
- System Efficiency: 84.5 dB @ 1 W / 1 m
- System Nominal Impedance: 4 Ohm
- System Frequency Response: 64 Hz - 24 KHz +/- 3 dB
- UPC 0699440990400
- Color: Black
- Manufacturer's Limited Warranty - 1 Year(s)
- Sold: Each

C1-400x Coaxial - Physical Specifications
|
Frame Outer Diameter* (A)
|
4.03 in / 102 mm
|
Grille Tray Outer Diameter (B)
|
N/A
|
Motor Outer Diameter (C)
|
2.33 in / 59 mm
|
Frontal Coaxial Tweeter Protrusion** (D)
|
0.61 in / 16 mm
|
Frontal Grille Protrusion (E)
|
N/A
|
Mounting Hole Diameter (F)
|
3.70 in / 94 mm
|
Mounting Depth (G)
|
1.81 in / 46 mm
|
*Does not take into account mounting tabs
**Frontal coaxial tweeter protrusion measured from
mounting surface
The
C1-400x Product Manual
JL Audio (C1-400x) - 4in (100mm) Coaxial Speaker System
Please Note:
- This Selection Is JL Audio (C1-400x) ONLY.
- Manufacturer's product specifications,
packaging and limited warranties (if applicable) are
subject to change.
- Images are solely for illustrative purposes and may
reflect multiple items or multiple views of a single
item.
- This Item Is Sold: Each