Operating Voltage; Grounding - Lab.gruppen E 4:2 Operation Manual

9. Operating voltage

9. Operating voltage
All E Series amplifiers have a universal power supply that accepts mains voltages from 100-240 V @ 50 or 60 Hz.
The amplifier requires 85 V to start, but will remain in service with mains voltage dips down to 60 V; however,
power output will be limited if it's less than 100 V. An IEC male receptacle is provided on the rear panel of all
amplifiers. The IEC cord included with each amplifier has a male plug appropriate for the power receptacles in the
country in which it was sold. If substituting a different IEC mains cord for use in another country, use only a cord
that is grounded and approved for 3 A or more. Make sure it is connected to a grounded mains outlet.
Once a suitable AC supply is connected, the amplifier will go into standby as indicated by amber illumination of the
"power" LED (front and rear panel).
When the amplifier is turned on it goes through a soft-start sequence as it self-checks its circuits. The "power" LED
becomes green to indicate that the amplifier is on.

10. Grounding

E Series amplifiers have no ground lift switch or terminal. The signal ground is always floating, via a resistor, to
chassis and therefore the grounding system is automatic.
In the interests of safety, never disconnect the earth (ground) pin on the AC power cord. Use balanced input
connections to avoid hum and interference. If this is not possible; connect the "–" pin to signal ground.
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E SERIES Operation Manual rev 2.0.0