MINA OPERATING INSTRUCTIONS
15

MINA VOLTAGE REQUIREMENTS

MINA operates safely and continuously when the AC voltage
stays within 100–264 V AC at 50 or 60 Hz. The loudspeaker
can withstand continuous voltages up to 275 volts and
allows any combination of voltage to GND (neutral-line-
ground or line-line-ground).
If the voltage drops below 90 V (brownout), MINA uses
stored power to continue operating temporarily; the loud-
speaker shuts down if the voltage does not rise above the
low boundary before the stored power is used.
If the voltage rises above 275 V, the power supply immedi-
ately shuts off to prevent damage to the unit.
If MINA shuts down due to either low or high voltage, its
power supply automatically powers up again after three sec-
onds, so long as the voltage has returned to its normal oper-
ating window. If MINA does not power up after 10 seconds,
remove AC power immediately and contact Meyer Sound
Technical Support.
CAUTION: The power source for MINA should
always operate within the required voltage
range, at least a few volts from the upper and lower
ranges. This will ensure that AC voltage variations
from the service entry — or peak voltage drops due
to cable runs — will not cause the loudspeaker’s
amplifiers to cycle on and off or cause damage to the
power supply.
NOTE: When voltage fluctuates within MINA’s
operating range, automatic tap selection stabi-
lizes the operating voltage. This tap selection is
instantaneous with no audible artifacts.
NOTE: Since MINA does not require a dedi-
cated neutral line, and it can tolerate elevated
voltages from the ground line, it can be connected to
line-line terminals in 120 V, 3-phase Wye systems.
This results in 208 V AC between lines (nominal) and
therefore draws less current than when using 120 V
AC (line-neutral). Make sure that the voltage remains
within MINA’s recommended operating window
(100-264 V AC). The ground line must always be used
for safety reasons and the line-to-ground voltage
should never exceed 264 V AC (typically 120 V AC
from line-to-ground).

Powering Up MINAs

When AC power is applied to MINA, its Intelligent AC™
power supply automatically selects the correct operating
voltage, allowing it to be used internationally without manu-
ally setting voltage switches. In addition, Intelligent AC pro-
vides soft-start power up, eliminating high inrush currents;
suppresses high-voltage transients up to several kilovolts;
filters common mode and differential mode radio frequen-
cies (EMI); and sustains operation temporarily during low-
voltage periods.
When powering up MINA, the following startup events occur
over several seconds.
1. Audio output is muted.
2. Voltage is detected and the power supply mode is auto-
matically adjusted as necessary. The power supply
ramps up.
3. During the power up sequence, the three-color On/Temp
LED flashes all three colors.
4. After the power up sequence and system check have
completed, the ON/Temp LED turns solid green, indicat-
ing the loudspeaker is ready to reproduce audio.
CAUTION: If the ON/Temp LED does not turn
solid green after powering up and audio is
muted, the loudspeaker has encountered a failure
and may need to be serviced. Contact Meyer Sound
Technical Support.

MINA CURRENT REQUIREMENTS

The current draw for MINA is dynamic and fluctuates as
operating levels change. Since different cables and circuit
breakers heat up at varying rates, it is important to under-
stand the following types of current ratings and how they
affect circuit breaker and cable specifications.
■Idle Current — The maximum rms current during idle
periods.
■Maximum Long-Term Continuous Current — The
maximum rms current during a period of at least 10 sec-
onds. The Maximum Long-Term Continuous Current is
used to calculate temperature increases for cables, to
ensure that cable sizes and gauges conform to electrical
code standards. The current rating is also used as a rat-
ing for slow-reacting thermal breakers.
■Burst Current — The maximum rms current during a
period of around one second. The Burst Current is used
as a rating for magnetic breakers. It is also used for cal-
culating the peak voltage drop in long AC cable runs
according to the following formula:
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