4
If the voltage decreases below the lower bound of either
operating range (brown-out), the supply uses stored
energy to continue functioning briefly. The unit turns off
if the voltage does not increase above the threshold
before the storage circuits are depleted. The time that the
MSL-6 continues to operate during brown-out depends
on how low the voltage drops and the audio source level
during this period.
If the voltage fluctuates within either operating range,
automatic tap selection stabilizes the internal operating
voltage. This tap selection is instantaneous and there are
no audible artifacts. If the voltage increases above the
upper bound of either range, the power supply turns off
rapidly, preventing damage to the unit.
If the MSL-6 shuts down due to either low or high
voltage, the power supply automatically turns on after
three seconds if the voltage has returned to either normal
operating range. If the MSL-6 does not turn back on after
ten seconds, remove AC power and refer to the
TROUBLE-
SHOOTING NOTE
above.
NOTE: We recommend that the supply be operated at
least a few volts away from either window’s upper and
lower bounds so that small AC voltage variations do not
cause the supply to cycle on and off.
Current Requirements
The MSL-6 presents a dynamic load to the AC mains
which causes the amount of current to fluctuate between
quiet and loud operating levels. Since different types of
cables and circuit breakers heat up at varying rates, it is
essential to understand the types of current ratings
and how they correspond to circuit breaker and cable
specifications.
The maximum continuous RMS current is the maximum
RMS current in a period of at least 10 seconds. It is used
to calculate the temperature increase in cables, which is
used to select cables that conform to electrical code
standards. It is also used to select the rating for slow-
reacting thermal breakers.
The maximum burst RMS current is the maximum RMS
current in a period of approximately 1 second. It is used
to select the rating for most magnetic breakers.
The maximum instantaneous peak current during burst
is used to select the rating for fast-reacting magnetic
breakers and to calculate the peak voltage drop in long
AC cables according to the formula
V
pk
drop
=
I
pk
x
R
total cable
Use the table below as a guide to select cables and circuit
breakers with appropriate ratings for your operating
voltage.
s
g
n
i
t
a
R
t
n
e
r
r
u
C
6
-
L
S
M
V
5
1
1
V
0
3
2
V
0
0
1
S
M
R
s
u
o
u
n
i
t
n
o
C
.
x
a
M
A
4
1
S
M
R
A
7
S
M
R
A
6
1
S
M
R
S
M
R
t
s
r
u
B
.
x
a
M
A
6
2
S
M
R
A
3
1
S
M
R
A
0
3
S
M
R
t
s
r
u
B
g
n
i
r
u
D
k
a
e
P
.
x
a
M
A
8
3
K
A
E
P
A
8
1
K
A
E
P
A
2
4
K
A
E
P
The minimum electrical service amperage required by a
system of MSL-6s is the sum of their maximum
continuous RMS current
. We recommend allowing an
additional 30% above the minimum amperage to prevent
peak voltage drops at the service entry.
TROUBLESHOOTING NOTE: In the unlikely case that
the circuit breakers trip (the white center buttons pop
out), do not reset the breakers! Contact Meyer Sound for
repair information.
Power Connector Wiring Conventions
Use the following AC cable wiring diagram to create
international or special-purpose power connectors:
brown = hot
blue =
neutral
yellow/green =
earth ground
(chassis)
AC cable color code
If the colors referred to in the diagram don't correspond to
the terminals in your plug, use the following guidelines:
• Connect the blue wire to the terminal marked
with an N or colored black.
• Connect the brown wire to the terminal marked
with an L or colored red.
• Connect the green and yellow wire to the terminal
marked with an E (or
) or colored green (or
green and yellow).
