Tannoy KINGDOM ROYAL Manual page 39

If the cables and connections have been
made correctly as described above the
loudspeakers will be automatically in
phase with each other. However if
phasing is felt to be incorrect (for
example, diffuse stereo image, lack
of bass) then apply the following test:
Place the loudspeakers side by side and
play a monophonic signal from the
amplifier, choosing the programme
material with a strong bass content.
If phasing is correct bass will be full
and rich. If incorrect there will be very
little bass due to cancellation effects.
Incorrect phasing can be remedied by
reversing the connecting leads to one
loudspeaker (at either the amplifier or
the loudspeaker terminals but not both).
Note: Be certain to ensure that the
amplifier is switched off when
connecting or disconnecting
loudspeaker leads. Also accidentally
shorting the loudspeaker leads together
can damage some amplifiers. Such
damage is outside warranty provisions.
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