Abbingdon Music Research DP-777 Premier Class - Manual (Page 18)

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3.7 Signal Polarity
In some instances, it may be more preferrable to listen to music with the signal phase inverted.
The DP-777 ships with positive phase selected by default. No extra indicator will be lit.
It is possible to press and hold the “AMR” button (RD7) in which case, a “-” indicator will be displayed to depict
that the signal polarity has been inverted.
3.7 Factory Reset
Whilst holding the “ ” and the “+” buttons on the front panel and then powering up the DP-777 via the Mains
Power Switch (R10) until the countdown commences will reset the DP-777 to the default factory settings.
To reboot the propri-
etary software...
To invert signal
polarity...