Description; Uses; Block Diagram - Ramiaudio AMC620 Manuel Utilisateur

DESCRIPTION

AMC620 is a six headphone amplifier unit, with possibility of external volume control. This unit allows
you to supply six headphones from one or two balanced modulation line inputs (Impedance should
be from 8 Ohms to 600 Ohms). The headphone 1 is always supplied with modulation A; the
headphones 2 to 6 are supplied with modulation A or modulation B. This function is used, for
example, to manage the sending to the principal presenter and to the guests in different ways.
All the headphones of the AMC620 are equiped with VCA affording o control the volume either via
the front panel switching, or via a remote control. The external control can be applied either on only
headphone1, or on headphones 2 to 6, or all headphones.
The AMC620 comprises 2 distinct talk back inputs with a lot of configuration possibilities, as follow :
The talkback1 is routed to the headphone1, the talk back 2 is routed to the headphone 2 to 6, but

there is a possilbility of cross coupling, affording all configurations.
The talkback authorization can be given , either via the presence modulation start, or via dry loop,

or via 5 Volts to 24 Volts voltage.
Routing of talk back either on left ear, or on right ear, or on both.

AMC620 comprises a device allowing to limit, on sixteen levels, the maximum volume level on
headphones. This device will be very appreciate in media library, to avoid too much acoustic pressure
for guests.
A VCA remote control and headphone output unit is available under AMC616 reference. It is used to
make the cabling easier with the ampli headphone, AMC620.

USES

Headphones dispatching in audio and video environnement.

Everywhere a gain remote control is needed.

Complete managing of two headphone modulation and from distinct orders.


BLOCK DIAGRAM

+
L
-
INPUT A
+
R
-
+
L
-
INPUT B
+
R
-
Selection

A or B
ORDER 1
Micro/Line
Ext Config/
+
Remote Input
-

Coupled 1 2

Coupled 2 1
+
-
ORDER 2
Ext Config/
Micro/Line
Remote Input
Rami
-
-
-
-
2 to 6
PROGRAMABLE
-Auto/Manual
LOGIC
-Loop order
-Left / Right
VCA MUTE
and
ORDER sending
-Auto/Manual
-Loop order
-Left / Right
Internal
Volume 1
Internal
Volume 2
LEFT
RIGHT
In/Ext Volume
LEFT
RIGHT
EXT
VOLUMES
(1 to 6)
12
+V
VCA
-V
+V
VCA
-V
+V
VCA
-V
+V
VCA
-V
HEADPHONES 3
HEADPHONES 4-5-6
Amplifier
Power Supply
+V
-V
1 2 3 4 1 2 3 4
on on
Power limitation
HEADPHONES 1
HEADPHONES 2
AMC620