PMC TWENTY5 21, User Manual

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TM
Advanced Transmission Line
Tip
Tip
The source of PMC’s legendary natural and wholly
realistic sound is the Advanced Transmission Line
(ATL
TM
) bass-loading technology.
ATL
TM
is an ingenious design which uses energy
generated by the bass unit in a much more
intelligent and efficient way than speaker designs
based on ported or sealed boxes.
In ATL
TM
loudspeakers, the highly braced cabinet
is lined with a multitude of custom-designed
acoustic materials that absorb all but the very
lowest frequencies. These are guided to exit from
a vent on the front-panel, extending the low-
frequency response and creating the impression
of a far larger speaker with an extra, ultra-high
quality bass unit.
ATL
TM
improves more than just the bass response:
because the low end is clean and clear it doesn’t
mask the rest of the music. Vocals in particular,
are beautifully projected and ultra-vivid.
ATL
TM
loudspeakers offer another benefit. The ATL
TM
bass extension does not change with volume
level – so even when listening quietly the bass
sounds balanced and well defined.
This cross-sectional view of the
twenty5.24
loudspeaker shows the
ATL
TM
cabinet
arrangement and the unique
Laminair
TM
vents