Engl TUBE PREAMP 570, Руководство оператора

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44 & 45 FREQUENCY COMPENSATED LINE OUT BALANCED
46 LINE OUT GROUND
IMPORTANT NOTE:
47 LEVEL
48 STEREO OUTPUT RIGHT
49 STEREO OUTPUT LEFT
50 FX LOOP RETURN RIGHT
These are the frequency-corrected (compensated) and balanced right and left channel
line outputs. Pin 2 and 3 of the XLR jack carry the signal, pin 1 = N.C. or ground
depending on the position of the Ground switch (46).
You can insert the signals routed through these
outputs directly into a mixing console or recording gear equipped with balanced
inputs. The advantage of a balanced circuit is that this type of connection will not
create a ground loop, provided of course it is wired correctly. Dial in the desired signal
level for the two balanced line outputs by adjusting the Level knob (43).
This switch assigns pin 1 of the two XLR sockets to ground (Ground to Pin 1). You'll find
this option comes in handy when you want to earth the circuit you have routed to a
mixing console or recording device.
You encounter something called a ground loop if your preamp is
connected to a mixing console or recording gear and pin 1 of both devices' XLR
connectors serve as ground terminals (the XLR Ground button on the preamp is set to
Ground to Pin 1). A ground loop is readily identified by the infernal humming
emanating from your speakers. Set this button to the position "Ground Floated" to
solve the problem!
This button determines the output level of the stereo output jacks. Press the button to
set a higher level (up to +15 dB) suitable for driving less sensitive power amps. Do not
press if you need a lower level (up to -5 dB) to feed the signal to additional signal
processors or extremely sensitive power amp inputs.
This unbalanced ¼" line out jack carries the preamp's right channel signal. You can
patch the signal routed to this jack to a power amp or a signal processor using a
shielded cord equipped with ¼" plugs.
This unbalanced ¼" line out jack carries the preamp's left channel signal. You can patch
the signal routed to this jack to a power amp or a signal processor using a shielded cord
equipped with ¼" plugs.
Connect the right FX Loop input to a signal processor's right channel output/send jack
using the shortest possible shielded cord equipped with 1/4" plugs. Activate and
deactivate it via the Stereo FX Loop (17) button. In the signal path, the
is located post channel Volume controls and and pre the Master volume control and
the output driver stage.
Stereo FX Loop
The signal routed to this output
limits the response of a guitar cabinet.
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