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,
attacking 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 – even if similar
drivers were used.
Moreover, the very consistent bass driver
loading brings the welcome benet that
the frequency response remains consistent
regardless of listening level, and analytical
auditioning can be conducted without
needing high replay volumes just to achieve
an optimal bass response. This is a unique
and very valuable characteristic of PMC’s
Advanced Transmission Line.
How it works
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 benets 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 (the
Advanced Transmission Line). This cavity
is heavily damped with acoustic material
specied 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 benet of the ATL
™
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 signicantly
TM
Advanced Transmission Line
‘No other bass-loading
technology provides such
resolution & tonal accuracy
at all volume levels’
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