Gradient 1.4 Owner's Manual page 11

THE CHOICE OF AMPLIFIER
The amplifier power output needed depends on the listening
level, the size of the room and many other factors having
influence on the room acoustics. It is recommended to use
an amplifier of 2 x 50W ... 250W / 8 ohms. Also higher
powered amplifiers can be used with caution due to their
increased potential for speaker damage.
When using two power amplifiers, the following should be
considered:
• The voltage gain of the amplifiers must be the same.
Otherwise the volume ratios of the sound ranges are
changing.
• If only one amplifier has a volume control, its gain must be
equal to or greater than that of the other amplifier.
Otherwise the sound level cannot be adjusted the same.
• If the power amplifiers are different, make sure whether
they are phase inverting or non-inverting in order to get
correct phasing.
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