6Main characteristics:• 2 x 70W RMS (AMPACK2-70) or 4 x 70 WRMS (AMPACK4-70) amplifier at 4 Ω• Integrated power supply• AUTO STANDBY: when no signal is present, the AMPACK enters the Standby mode, reducing itspower consumption• Silent amplifier (convection cooling, without fan)• Stereo, parallel and bridged operating modes are available• VCA based remote control for volume (independent for each input channel)• EUROBLOCK connectors for input, output and VCA remote control• Additional RCA stereo input jack (AMPACK2-70 only)• Mono 1+2 switch (AMPACK2-70 only)• Independent gain controller for each channel, protected against unintentional changes• Integrated 100Hz high-pass filter• Direct mounting on 35mm DIN rail3. INSTALLATION3.1. Placement and mountingAMPACK series is suitable for direct mounting on 35mm DIN rail3.2. Mains connectionThe amplifier is powered with alternate current, 220-240V 50/60Hz.The amplifier should have an earth connection in good conditions (earth resistance, Rg=30Ωor less). The environment must be dry and dustless. Do not expose the unit to rain or water splashes,and do not place liquid containers or incandescent objects like candles on top of the unit. Do notobstruct the ventilation grids with any kind of material.In case there is some type of intervention and/or connection-disconnection of theamplifier, it is most important to previously disconnect the mains power supply. There areno user or serviceable parts inside the amplifier.You should avoid that the supply cable twists with the shielded signal cables, as thiscould lead to unwanted hum.Additionally, as a corrective measure of hum caused by situations like these ones, theAMPACK series has a built-in high-pass filter with a 100Hz cut-off frequency and a front panel switch toactivate it.