CHAPTER 2: POWER REQUIREMENTS
13
Supported PowerCON 32 Cable Gauges
While the powerCON 32 connector supports cable gauges of
14–10 AWG (2.5–6.0 mm
2
), because of LYON’s current draw,
10 AWG (6.0 mm
2
) should be used whenever possible.
LYON VOLTAGE REQUIREMENTS
LYON operates as intended when receiving AC voltage within
the following ranges:
•85–134V AC, 50–60 Hz
•165–264V AC, 50–60 Hz
If the voltage drops below 85 V, the loudspeaker uses stored
power to continue operating temporarily; the loudspeaker
powers off if the voltage does not return to its operating range.
If the voltage rises above 275 V, the power supply could
become damaged.
CAUTION: The power source for LYON should
always operate within the required operating
range, at least a few volts from the upper and lower
limits. This ensures that AC voltage variations from the
service entry—or peak voltage drops due to cable
runs—will not cause the loudspeaker’s amplifier to
cycle on and off or cause damage to the power supply.
LYON CURRENT REQUIREMENTS
Current draw for loudspeakers is dynamic and fluctuates as
operating levels change. Because different cables and circuit
breakers heat up at varying rates, it is important to understand
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 seconds. The maximum long-term continuous current
is used to calculate temperature increases for cables to
ensure that the size and gauge of the cables conform to
electrical code standards. The current rating is also used
to select appropriately rated, slow-reacting thermal
breakers, which are recommended for loudspeaker
power distribution.
•Burst Current — The maximum rms current during a
period of around 1 second. The burst current is used as
a rating for magnetic breakers. It is also used for calcu-
lating the peak voltage drop in long AC cable runs
according to the following formula:
V pk (drop) = I pk x R (cable total)
•Maximum Instantaneous Peak Current — A rating for
fast-reacting magnetic breakers.
•Inrush Current — The spike of initial current encoun-
tered when powering on.
Use the information provided in Table 2 as a guide for
selecting the gauge of cables and the circuit breaker ratings
for the system’s operating voltage.
The minimum electrical service amperage required by a
loudspeaker system is the sum of the maximum long-term
continuous current for all loudspeakers. An additional
30 percent above the combined Maximum Long-Term
Continuous amperages is recommended to prevent peak
voltage drops at the service entry.
NOTE: For best performance, the AC cable volt-
age drop should not exceed 10 V (10 percent at
115 V and 5 percent at 230 V). This ensures that the
AC voltage variations from the service entry—or peak
voltage drops due to longer cable runs—do not cause
the amplifier to cycle on and off.
DO NOT RESET CIRCUIT BREAKERS!
CAUTION: In the unlikely event that one of
LYON’s circuit breakers trips (the center button
disengages), disconnect the AC power cable and
contact Meyer Sound for repair information. DO NOT
attempt to reset the breaker or reconnect the AC
power cable.
INTELLIGENT AC POWER SUPPLY
LYON’s Intelligent AC™ power supply automatically selects
the correct operating voltage (allowing the loudspeaker to be
used internationally without manually setting voltage
switches), eliminates high inrush currents with soft-start
power up, suppresses high-voltage transients up to several
kilovolts, filters common mode and differential mode radio
Table 2: LYON Current Draw
Current Draw208 V AC 230 V AC100 V AC
Idle0.7 A rms 0.6 A rms 1.2 A rms
Maximum Long-
Term Continuous
6.2 A rms 5.6 A rms 11.2 A rms
Burst8.2 A rms 7.5 A rms 15.4 A rms
Maximum
Instantaneous Peak
25 A peak 23 Apeak 45 A peak
Inrush<15 A peak<15 A peak<15 A peak
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