Low-Frequency Transducer - JBL 4344 MKII Owner's Manual

Professional Series 4344MkII
With the Loudspeakers, JBL
combines the most advanced technology with a classic JBL design. These
speakers continue the longstanding tradition of precise studio monitor
sound for which JBL is famous. You will enjoy the benefits of a 2" high-
frequency compression driver, cast frame low-frequency transducers with
vented pole pieces, and JBL's proprietary Symmetrical Field Geometry
magnet design, as well as high definition dividing networks incorporating
the highest quality electronic components available.

Low-Frequency Transducer

4344MkII
The features an all-new 15" (381mm) low-frequency
4344MkII
transducer developed specifically for the . Derived from
JBL's legacy of highly powerful yet efficient bass drivers, this woofer
delivers full low-frequency performance with clarity and speed
unprecedented among 15" drivers. The voice coil is 4" (102mm) in
No.
diameter and wound on edge from flat aluminum ribbon wire on a
thermoset composite ™ form.
4
The cone is a rigid paper composite, treated with Aquaplas ™ for strength,
speed, and damping. JBL's Symmetrical Field Geometry is employed in
the form of an aluminum sleeve around the pole piece. This sleeve reduces
second-order distortion through induced flux control. Its aluminum
composition is also a more efficient conductor of heat, so it assists in
dissipating heat away from the voice coil to extend the power capacity.
Cooling of the voice coil is further enhanced by the use of a vented pole
piece. The rigid frame is cast from aluminum alloy, an excellent
thermal conductor, which further acts to efficiently draw heat away from
the voice coil and magnet assembly. This combination of advanced design
technology results in a bass driver that is remarkably free from dynamic
restriction due to heat buildup.