A SYSTEMS DM434, User Manual

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4
DM434
English
INTRODUCTION
Congratulations on your purchase of the DM434 four-zone
mixer that is ideal for use in all manners of installations,
in such venues as hotels, convention centers, theatres,
restaurants and retail outlets. The DM434 offers three
stereo line inputs, on paging microphone input with EQ
and ducking depth, and an emergency input� Four zone
outputs provide maximum zone separation and a mono
“utility” output is also included for such areas as restrooms
and foyers� Zone and utility outputs all have individual
source selectors and level controls, while the first two
zones are selectable as stereo/mono� An emergency
interface connector allows for an override control and
insert of emergency message paging� The added option
of remote volume control for each zone makes the DM
mixers a must-have for your zone mixing requirements�
FEATURES
• Three unbalanced line-level stereo RCA inputs with
individual trim controls
• Four balanced zone outputs with independent source
select switches and level controls
• Balanced XLR paging microphone and 3-pin phoenix
euroblock emergency microphone inputs
• Microphone ducking depth and EQ controls
• Balanced 3-pin phoenix/euroblock utility output provides
audio to general utility areas (foyers, restrooms, etc)
• Remote level controls can be wired to all four zones
• Utility output source selectable
• Stereo/mono switch on zones 1 and 2
• Optional acessory: RM-2 wall-mount rotary controls
INSTALLATION
Rack Mounting
The Asystems DM434 zone mixers are standard 1U
rack mountable mixers� An additional 4” of depth are
needed behind the mixer to allow room for the back panel
connectors� To avoid overheating, be sure that there is
enough ventilation space around the unit for cooling� Do
not place the mixer in contact with, or directly on top of,
high temperature devices such as power amplifiers.
Connectors
DM434 zone mixers use balanced XLR jacks for paging
microphone input, unbalanced stereo RCA jacks for
music input, and balanced 3-pin phonix/euroblock jacks
for emergency audio, zone output and utility output� RJ-
45 jacks provide input and output for paging and remote
level control, while an RS-232 D-type 9-pin connector is
provided for source link�
Impedance
The microphone input impedance is less than 2k ohms�
The outputs of the DM434 are electronically balanced with
output impedance lower than 120 ohms� When driving
transformer coupled loads, it may be necessary to create
600 ohm source impedances� For this purpose, install two
247 ohm resistors in series with pin 2 and 3�
Mains Connection
The DM434 uses a standard IEC receptacle and a
universal mains cable to make the AC mains connection�
Make sure all units in the sound system are correctly
grounded� For your own safety, do not remove the ground
connection within the units or on the supplied cable, or
fail to make this connection at all� The audio ground is
capacitor decoupled so please isolate it from the power
ground� Do not attempt to solve ground loop problems by
disconnecting the power ground�
Safety Fuse Replacement
A safety fuse protects the unit from serious malfunction�
The fuse will blow in the event of power problems or
short circuits� If this happens, please replace it with an
identical fuse only� If the new fuse also blows right after
replacement, it is likely there is a problem with the unit�
In that event, please contact Asystems for assistance in
getting the unit repaired� Never use fuses that are not
rated for the unit. This may cause fire or electric shocks.