Samson QH4 4-Channel Headphone Amplifier - Manual (Page 10)

Block Diagram
BALANCED 1/4” INPUTS
L/MONO
AUX IN
MASTER
MONO
MASTER
VOLUME
MASTER
MUTE
UNBALANCED STEREO
1/8” INPUT
RIGHT
AUX OUT
1/4” HEADPHONE OUTPUTS
UNBALANCED STEREO
1/8” OUTPUT
VOLUME 1
VOLUME 2
VOLUME 3
VOLUME 4