Brochure

PMC’s unique ATL
™
(Advanced Transmission Line)
enclosures have taken loudspeaker design to the
highest level, using sophisticated cabinet construction,
proprietary drive units, and patented absorption
materials and techniques. The benets are enormous
compared to the relatively simple sealed and ported
designs currently available elsewhere.
PMC’s innovative approach places the bass driver
near one end of a long cavity ATL
™
(the Advanced
Transmission Line). This cavity is heavily damped with
acoustic material specied carefully to absorb the
upper bass and higher frequencies radiating from
the rear of the bass driver. The lowest frequencies are
allowed to pass down the line and emerge from the
large frontal vent in the same polarity as the driver’s
direct radiation, the vent acting essentially as a second
bass driver.
An important benet of the approach is that the air
pressure inside the cabinet, which loads the bass driver,
remains consistent. This helps to maintain control of the
driver over a wide frequency range and signicantly
reduces LF distortion. Consequently, the upper bass and
mid-range detail is not masked by harmonic distortion
and the result is PMC’s characteristically transparent
mid-range, fast, dynamic bass, and outstanding
clarity.
A further advantage of the ATL
™
design approach
is greater bass extension and higher SPL capability
compared to typical ported or sealed designs of a
similar size and driver specication.
Moreover, the very consistent bass driver loading brings
the welcome benet that the frequency response
remains consistent regardless of listening level, and
analytical auditioning can be conducted without the
need for high replay volumes to achieve an optimal
bass response. This tonal consistancy at all output levels
is a unique and very valuable characteristic of PMC’s
Advanced Transmission Line.
TECHNICALLY& SONICALLY
SUPERIOR BASS
ATL
™
bass-loading technology offers the following
advantages over ported and sealed monitors:
• Exceptional LF extension with no colouration
• Identical tonal balance at all levels
• Higher SPLs without compression or listener fatigue
• More efcient
• A truly accurate response that translates