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      05-13-2015, 03:57 PM   #79
Artemis
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Drives: BMW M2C - BMW X1
Join Date: Jun 2011
Location: Belgium

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Akra + N55 mids: during 'spirited' Autobahn runs, after some time I start to hear a kind of 'double bass' whenever I floor the pedal. Hard to describe this phenomenon, but it sounds as if an extra rumble is added. Dies down when engine gets less stressed. Very likely heat-related.
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