Keep in mind that when labs are used as single units, less of
your amplifier power is being converted into acoustic energy
than when they are properly coupled as a group of 4-6.
The energy that doesn't come out as sound is released as heat in
the voice coil instead. Logically, you would expect to see a
single lab run less efficiently and have reduced power handling
as a consequence of the voice coil bottoming out more easily
and running hotter for the same input power.
~Clive.
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The LABs are sinners, they must be punished!