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Hi Gustavo,
The audio signal on the FLX6 should be peaking around the first orange LED on the channels and the master, then connect the RCA output from the DDJ-FLX6 to a line input on the DDJ-800. You should then adjust the trim knob on that 800's input channel until the level on the channel meter is also around the first orange LED. This should not result in any distortion as you have not clipped the signal.