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12” Coaxial Bass Midrange Driver
1” Entry Horn
■
High Sounding Quality
High Sound Pressure Level
X30
APPLICATIONS
SP4070 is a 12”high SPL high sounding quality 1”exit coaxial bass-midrange
driver derived from SP4040 basis and specially designed with coaxial horn
to match the behavior of a 1”entry HF compression chamber.
A mounting plate with gasket and standard fastening is supplied for the
fitting of the HF driver.
Its well balanced design between sensitivity / high power handling / bass-
extension, combined with linear response and smooth upper
roll-off, make it ideal in Sound Reinforcement for ultra compact two way
systems for proximity stage monitors, or side wedges of medium throw.
Recommended highest X-over is 2.5 kHz, while optimum acoustical load is
Reflex type of 30L to maximum 40L tuned from 52Hz to 56 Hz.
FEATURES
Power handling capacity 400 W AES
Reference efficiency
(1W @ 1m) 97 dB SPL
SPL max (continuous) 119 dB SPL
Usable frequency range 50-2500 Hz
Environmental withstanding Outdoor
DESIGN CONCEPT
DEFLECTION CONTROLLED DIAPHRAGM optimized for dynamic
damping. DEFLECTION CONTROLLED DIAPHRAGM technology consists
in optimizing the shape and material of the diaphragm so that it works
as a mechanical transmission line, to avoid breaking modes as well as
mechanical threshold which destroy sound quality.
This leading edge technology offers substantial sonic advantages.
Among them: sound coherency, fast transients, stable sound imaging,
high sensitivity, wide frequency range and reduced directivity pattern.
COMPACT MAGNET SYSTEM. Its design has been specially optimized to
obtain maximum transducing efficiency while avoiding unlinear
behavior such as coil inductance variation with position, flux
modulation, harmonic distortion, rest position offset, air compression
and off-axis voice-coil pushing.
Its design incorporates a T-shaped pole piece and a flux stabilization
ring. It also takes into consideration demagnetization at cold
temperatures.
INTERCOOLER SYSTEM (patented). Entirely integrated into the
loudspeaker itself, the INTERCOOLER SYSTEM extracts the heat
produced by Joule effect in the voice-coil by the means of an air
flow directed through the heatsink rims of the basket by the motion of
the dust-cap and the spider.
The gain brought about by this technology is over 20 % of extra
power, so for example, a 3”coil according to this design has the
same power handling capacity as a classical 4”one.
COAXIAL SYSTEM : PHL AUDIO COAXIAL SYSTEM concept is based on
a horn which is formed by the cone profile and the pole piece
extension of the LF driver.
The 1”horn entry is situated in the axis of the rear side of the magnet
system.The front access to the LF driver voice-coil is protected against
dust by an acoustically transparent dust-cap.
Coaxial drivers are always delivered with a compression driver
standard mounting plate, screws and a 1”O ring sealing gasket.
ARCHITECTURAL SPECIFICATIONS
NOMINAL DIAMETER : 300 mm.
FRAME : High tensile alloy pressure
die-cast basket with patented
INTERCOOLER SYSTEM.
MAGNET SYSTEM : 3” highly energized,
heat extracting design with flux
stabilizing ring and pole piece
incorporating concentric horn flare
VOICE COIL : High-temperature
stabilized copper wire wound on
high-strength glass polyimide
former.
CONE ASSEMBLY : High-strength
cellulose fiber cone impregnated
and front-coated with damped
resins, fitted with acoustically
transparent dust cap and high-
compliance treated double-roll
fabric surround
SPEAKER MASS : 8.7 kg
PROFESSIONAL SERIES
8 Ω
4070