Technics SB-G90 Owner's Manual page 17

Connecting with an amplifier
≥ Before connection, turn off the amplifier and disconnect its power cord.
≥ For details, refer to the operating instructions of the amplifier.
Connect the amplifier and speakers with speaker cables (commercially-available).
Amplifier (rear)
e.g.,
Speaker (right)
Speaker (left)
≥ Do not move the speaker while the speaker cables are connected. This may cause a short circuit.
≥ When the connections are completed, pull the speaker cables lightly to check that they are connected firmly.
≥ Wire the polarity (+/-) of the terminals correctly. Not doing so may adversely affect stereo effects or cause malfunction.
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