Meyer Sound 80 ユーザーズマニュアル

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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)

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Ultimate Short-Term Peak Current — A rating for fast-
reacting magnetic breakers.

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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.

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.

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.

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.

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.

Pay close attention to these important electrical and safety 
guidelines.

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The Acheron requires a grounded outlet. Always use a 
grounded outlet and plug.

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

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

Earth ground

Chassis ground