Advanced Transmission Line; Tip - PMC twenty5i Series User Manual

Advanced Transmission Line

The source of PMC's legendary natural and wholly
realistic sound is the Advanced Transmission Line
(ATL ) bass-loading technology.
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ATL
is an ingenious design which uses energy
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generated by the bass unit in a much more
intelligent and efficient way than speaker designs
based on ported or sealed boxes.
In ATL
loudspeakers, the highly braced cabinet
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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
improves more than just the bass response:
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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 loudspeakers offer another benefit. The ATL
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bass extension does not change with volume
level – so even when listening quietly the bass
sounds balanced and well defined.
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Tip

Tip
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This cross-sectional view of the twenty5.24
loudspeaker shows the ATL
arrangement and the unique Laminair
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cabinet
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vents
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