Audio Research GSPre, Руководство пользователя

Страница: 13 / 22

13
Operation
Invert
The invert button will change the polarity of the
output signal. This is useful for recordings that
may have been recorded with inverted phase.
Impedance
The impedance button allows you to change the input
impedance associated with the ‘Phono’ input; this
feature only operates when the ‘Phono’ input is selected.
To match the impedance of the GSPre with your
cartridge, refer to the specifications included
with your phono cartridge. If no impedance
is indicated, contact the manufacturer.
If your cartridge impedance is different from the five
settings offered on the GSPre, select the number
which is closest to that of your cartridge.
Note
Because it offers an additional gain stage, the Phono
input should only be used with a turntable. Connecting
another source, such as a CD player or TV to this
input, may cause significant distortion which can
cause serious damage to your amplifier or speakers.
Remote Only Functions
In addition to the controls found on the front
panel, the remote control offers access to the
following additional features of the GSPre.
Display Brightness Adjustment
The front panel display has six brightness settings, as
well as the ability to dim the display completely. To
change the brightness, use the ‘DSP UP’ or ‘DSP DN’
buttons on the remote. Note that when the display
is completely dimmed, a small square appears in the
middle of the display to indicate the unit is powered on.
Hours
Pressing the ‘HOURS’ button will display the total
accumulated hours of operation for the GSPre. This
is useful to determine the approximate number
of hours the vacuum tubes have been in use.
After five seconds, the display will revert to the
normal operation screen. After replacing vacuum
tubes, the hours counter should be reset (see
instructions under ‘Settings Menu’ on page 17).
Note
The installed 6H30 vacuum tubes have an average
life span of approximately 4,000 hours. After this
time, we recommend replacing them to maintain
the best performance of your preamplifier.