I want to set how far the volume is decreased when the MUTE button is pressed

-20 dB, -40 dB or - ∞ can be set. link

I want to turn the illumination lamps on both sides of the unit main panel off

Set the illumination lamp to off. link

I want to use two or more of PM-KI RUBY units for high quality playback

Use the stereo complete bi-amp

Use the multi-channel playback connections. link

I want to use this unit’s remote control to operate a Marantz CD player

Press the REMOTE MODE CD button to switch the remote control to the CD player operating mode. link

Also, refer to the instruction manual of the CD player.

I want to use this unit as a power amplifier

Connect the pre amplifier to the POWER AMP IN connectors of this unit. link

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