Proel AMP03 - Manual (Page 12)

6. OPERATIONS:
a. Pressing the POWER switch the unit turns on, and its LED is lit.
Pressing it again the unit turns off.
b. BASS (150Hz) control modifies signal lower frequencies output (up to
10 dB of boost or cut). Set this control level by personal taste and
ambient acoustic character.
c. MIDDLE (1kHz) control modifies signal lower frequencies output (up to
10 dB of boost or cut). Set this control level by personal taste and
ambient acoustic character.
d. HIGH (6kHz) control modifies signal lower frequencies output (up to 10
dB of boost or cut). Set this control level by personal taste and ambient
acoustic character.
e. MIC 1, MIC 2 and AUX/PHONO inputs have their own independent
volume control. These controls allows to set their level in order to listen
to each program source at the desired level.
f. Turning clockwise the MASTER volume control, the playback level will
raise, turning it counter clockwise it will be lower.