Kustom Arrow 16DFX - Manual (Page 5)

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15.) Speaker - This speaker jack is used for an external speaker. Note: The internal speaker in the
Arrow16DFX will not function when this jack is used.
16.) Headphone - This is a 3-conductor 1/4" (Stereo) jack that amplifies the signal at headphone levels.
Note: The amplifier's speaker is disconnected when this jack is used.