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Advanced Transmission Line
The source of PMC's legendary natural and wholly realistic sound is the Advanced Transmission
Line (ATL
) bass-loading technology.
TM
ATL
is an ingenious design which uses energy generated by the bass unit in a much more
TM
intelligent and efficient way than speaker designs based on ported or sealed boxes.
In ATL
loudspeakers, the highly braced cabinet is lined with a multitude of custom-designed
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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: because the low end is clean and clear it
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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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level – so even when listening quietly the bass sounds balanced and well defined.
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bass extension does not change with volume
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Tip
Tip
This cross-sectional view of the BB5
loudspeaker shows the ATL
cabinet
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