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Connecting a pre-amplifier or power amplifier
Connect a power amplifier to the unit to use it as a pre-amplifier, or connect a pre-amplifier to the unit to use it as a power amplifier.
When connecting a pre-amplifier and using this unit as a power amplifier, switch the input source to “Power Amp Balanced” or “Power Amp Unbalanced”. link
The POWER AMP IN (UNBALANCED) connectors are equipped with a short-circuiting pin plug. Remove this plug to connect a pre-amplifier. Store the removed short-circuiting pin plug in a safe place so as not to lose it.
NOTE
Never insert the short-circuiting pin plug into the PREAMP OUT connectors. Doing so could result in damage.
About balanced connectors
This unit has both unbalanced and balanced connectors. The balanced connectors have three pins, making it possible to transmit audio signals as a balanced signal, reducing the effect of external noise. They also have a removable lock mechanism, which reduces shaking in the connector area, making the connection highly reliable.
The balanced connection is an all-stage balanced configuration.
Phases of the balanced connectors
The XLR connector is internally wired in either of the following two systems. This unit employs the European system.
European system ( 
PIN=HOT/ 
PIN=COLD)
USA system ( PIN=COLD / PIN=HOT)
If a product that employs the USA system is connected with this unit via a balanced cable, the output signal may be phase-inverted. To correct the inversion, connect the one side XLR connector reversing the PIN and PIN.