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ACHERON OPERATING INSTRUCTIONS
13
■ 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:
V pk (drop) = I pk x R (cable total)
■ Ultimate Short-Term Peak Current — A rating for fast-
reacting magnetic breakers.
■ Inrush Current — The spike of initial current encoun-
tered when powering on.
You can use Table 1 and Table 2 as guidelines for selecting
cable gauges and circuit breaker ratings for the system’s
operating voltage.
The minimum electrical service amperage required by an
Acheron loudspeaker system is the sum of the Maximum
Long-Term Continuous Current for each loudspeaker. An
additional 30 percent above the minimum amperage is rec-
ommended to prevent peak voltage drops at the service
entry.
NOTE: For best performance, the AC cable
voltage drop should not exceed 10 V, or
10 percent at 115 V and 5 percent at 230 V. Make
sure that even with AC voltage drops that the AC
voltage always remains within the operating win-
dows.
POWERING UP THE ACHERON
When AC power is applied to the Acheron 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 sup-
presses high-voltage transients up to several kilovolts, filters
common mode and differential mode radio frequencies
(EMI), and sustains operation temporarily during low-voltage
periods.
When powering up the Acheron, the following startup events
take place over several seconds.
1. Audio output is muted.
2. Voltage is detected and the power supply mode is auto-
matically adjusted as necessary.
3. The primary ultra low-noise fan turns on.
4. The power supply ramps up.
5. The green Active LED on the user panel lights up, indi-
cating the loudspeaker is ready to output audio.
CAUTION: If the Active LED does not light up,
or the Acheron does not output audio after ten
seconds, remove AC power immediately and verify
that the voltage is within the required range. If the
problem persists, contact Meyer Sound Technical
Support.
CAUTION: If either of the loudspeaker’s circuit
breakers trip (the white center buttons disen-
gage), make sure to disconnect the AC power cable
and wait one minute, to allow the stored power to
dissipate, before resetting the breakers. If necessary,
contact Meyer Sound for repair information.
ELECTRICAL SAFETY GUIDELINES
Pay close attention to these important electrical and safety
guidelines.
■ The Acheron requires a grounded outlet. Always use a
grounded outlet and plug.
Table 1: Acheron 100 and Acheron 80 Current Draw
Current Draw 115 V AC 230 V AC 100 V AC
Idle Current 0.71 A rms 0.38 A rms 0.79 A rms
Maximum Long-Term
Continuous Current
5.8 A rms 2.8 A rms 6.3 A rms
Burst Current 6.4 A rms 3.2 A rms 7.2 A rms
Ultimate Short-Term
Peak Current
26 A peak 14 A peak 28 A peak
Inrush Current 7 A peak 7 A peak 10 A peak
Table 2: Acheron LF Current Draw
Current Draw 115 V AC 230 V AC 100 V AC
Idle Current 0.64 A rms 0.32 A rms 0.85 A rms
Maximum Long-Term
Continuous Current
8.8 A rms 4.4 A rms 10.0 A rms
Burst Current 19 A rms 9.5 A rms 22 A rms
Ultimate Short-Term
Peak Current
39 A peak 20 A peak 45 A peak
Inrush Current 7 A peak 7 A peak 10 A peak
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Earth ground
Chassis ground