Mackie HM-4 Owner's Manual page 8

HM-4 4-Way Headphone Amplifier Block Diagram
INPUT
CAP
PHONE JACK
CAP
8
HM-4 4-Way Headphone Amplifier
LINE AMP
LA
OUTPUT LEVEL
LINE AMP
LA
LINE AMP
LA
OUTPUT LEVEL
LINE AMP
LA
LINE AMP
LA
OUTPUT LEVEL
LINE AMP
LA
LINE AMP
LA
OUTPUT LEVEL
LINE AMP
LA
FIXED RESISTANCE
PHONE JACK
FIXED RESISTANCE
FIXED RESISTANCE
PHONE JACK
FIXED RESISTANCE
FIXED RESISTANCE
PHONE JACK
FIXED RESISTANCE
FIXED RESISTANCE
PHONE JACK
FIXED RESISTANCE
HEADPHONE
HEADPHONE
HEADPHONE
HEADPHONE