MA60 & MA60
media
Installation and User Guide v1.0
32
General Notes
Multi-zone applications
Where the sound system specification
calls for separate control in several zones,
MA60s and/or MA60
media
s can be used
in multiples. These notes discuss the
principle of connecting external input
sources to several units in parallel. Note
that the integral media player in any one
MA60
media
will only play in the zone to
which its output is connected. However,
its Pre Out may be connected to the Line
Inputs of additional units (Line 1 would
be the logical choice), so that one media
player can act as an external source for
the other units.
Signal sources can be connected to several
inputs as required, but care must be taken
to ensure the output stage of the signal
source is capable of driving the resulting
lower input impedance. The impedance of
the line inputs (music inputs) is 47k ohm
and it is reasonable to assume that most
op-amp based signal sources are easily
able to drive a 10k ohm load, allowing up
to five MA60/MA60
media
s to be paralleled.
The input impedance of the mic input
is more than 2k ohm, making it suitable
for microphones with a nominal impedance of 600 ohms or less. A single 600 ohm
microphone could therefore typically be connected to four paralleled mic inputs. If
this guideline figure cannot be adhered to, the use of suitable mic or line distribution
amplifiers is recommended.
To avoid any problems associated with differences in mains supply earthing, we
recommend that all MA60/MA60
media
s used in a multi-zone application should be
co-located and connected to a common mains supply. Note that when using multiple
MA60/MA60
media
s in a 19” rack, suitable ventilation arrangements must be made to
ensure that lower units do not cause those above to overheat (see also “Ventilation”
on page 16).
MA60
MEDIA
MP3
DOCK
LIN
E INPUT
S
1
2
3
4
JUKEBOX
TV
TUNER
CD
PLAYER
MIC INPUT
MA60
MEDIA
MA60
MEDIA
LIN
E INPUT
S
1
2
3
4
LIN
E
IN
P
U
TS
1
2
3
4
PRE OUT
ADDITIONAL MA60s
MAIN OUT
MAIN OUT
MAIN OUT
