Butler TUBE DRIVER BLUE 475, Информация владельца

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9
Input Gain Control
There are Input Gain Controls located on the end panel on either
side of the 4 RCA input jacks. These are NOT volume controls!
They are designed to match the output signals of the source unit
to the amplifier inputs.
By turning the controls clockwise (to the right), the associated
RCA inputs of the amplifier become more sensitive and will allow
a weak signal as low as 450 mV to drive the amplifier to full
power. It is advisable, however to use the LOWEST possible
setting of the input gain controls by driving the amplifier with the
HIGHEST level from the source unit. This will reduce the potential
for the amplifier to reproduce
pops from brake light and accessory
switches and alternator whine or ignition tick .
In order to achieve the best Signal to Noise ratio possible, you
must carefully experiment by making a few practical listening tests
to adjust the 'headroom' of your system correctly. The basic rule
to remember is that best S/N ratio is achieved by using the
highest undistorted level from the source unit and the lowest
undistorted input level setting on the amplifier.
Summary
1. Start by setting the Input Gain Controls to just above
minimum.
2. Turn the master volume or output volume of the source unit to
almost full-undistorted volume.
3. With music playing, slowly increase the input Gain Controls
until you hear distortion. Turn down the Gain Controls until
the distortion stops.
This will set the approximate proper 'headroom' level to operate
the source unit/crossover/preamp with your Tube Driver BLUE.
Further minor adjustments may be made at any time if desired.