Koch STUDIOTONE-XL Bedienungsanleitung Seite 5

STUDIOTONE-XL BACK PANEL
[1] A.C. POWER
INPUT: Power cord input. The STUDIOTONE-XL is
equipped with a worldwide power supply. Inside the
amp a mains selector switch can be set on one of three
voltages, 100, 115 or 230. Either of these voltages will
work worldwide with minor power differences. The amp
will work on either 50 or 60 hertz. After resetting the
internal mains selector switch make sure fuses are
replaced with printed ratings on rear of amp.
FUSE: Both fuse and spare fuse are located on the
sled of the fuseholder. Fuse sled can be removed with
a screwdriver. If the fuse should fail, it must be
replaced with the same type and value in order to
avoid damage to the amp and to prevent voiding
the warranty. If the amp repeatedly blows fuses, check
for a bad power tube. If tube-failure is not the cause,
the amp should be taken to a qualified service center
for repair.
WARNING: Only a qualified technician should
attempt an input voltage change. Personel injury or
equipment damage may occur if done incorrectly.
WARNING: The fuse should be replaced or the
voltage should be reset only when the power cord
has been disconnected from its power source.
[2] HT FUSE: This fuse protects the internal HT power
supply in case of tube failure. If it blows, check for a
bad power tube. If tube failure is not the cause, the
amp should be taken to a qualified service center for
repair.
This fuse also must be replaced with the same type
and value in order to avoid damage to the amp and
to prevent voiding the warranty.
[3] REMOTE CHANNEL SWITCHING JACK: Provides
an input for the KOCH FS2-ST FOOTPEDAL (optional)
or for a remote channel switching unit, e.g. a MIDI
switcher, and automatically disconnects the 'Channels'
switch [2] on the front panel.
This jack is a stereo jack. The TIP controls switching
between Clean and OD, the RING between OD and
OD+. Both TIP and RING must be switched on/off to
ground, to realise channel switching.
[4] EFFECTS LOOP
TO FX (=SEND): This jack provides a buffered mono
output from the preamp of the STUDIOTONE-XL and
can be used to connect an external effects unit. This
jack must be connected with the input of the effects unit
(see also CONNECTION DIAGRAM).
FROM FX (=RETURN): This jack provides an input for
an external effects unit and must be connected to the
output of the unit. When used, it disconnects the
preamp of the STUDIOTONE-XL from the power amp
and therefore it also allows the STUDIOTONE-XL to be
used as a "satellite" for other preamps.
NOTE: The EFFECTS LOOP's mode is serial. Its
10dBV SIGNAL LEVEL guarantees compatibility with
both instrument-level effects like floor-pedals and
guitarprocessors, as well as line-level effects like
professional 19 inch rack mount devices.
NOTE: If the connection of an effects unit to the
STUDIOTONE-XL gives more hum, a ground-loop
may be the cause of it.
[5] RECORDING SECTION
This section provides a mono output suitable for
recording. Its signal is derived from the speaker output so
the typical tube saturation of the power amp will be
included; it also includes Reverb and External Effects
signals. This signal is shaped by a special filter that
simulates the typical recording characteristic of a
microphone placed in front of a guitar speaker.
VOICING SWITCHES
These switches change the slope of that filter as follows.
LEFT-HAND SWITCH: This switch provides selection
between the placing of a microphone pointed straigth to
the centre of the speaker (axis) or pointed more to the
edge (off-axis) wich results in less bright sound very
suitable for recording of distortion sounds.
RIGHT-HAND SWITCH: This selector selects simulation
of the typical characteristics of either a 1x12 or a 4x12
speaker cabinet. The 4x12 position offers higher low-end
pressure and more low-mids.
OUTPUT JACK: This jack is an unbalanced output for
recording (or PA) and provides the filtered and voiced
signal as described above. The output signal is at line
level (-10 to 0 dBV).
[6] LINE OUTPUTS
DIRECT OUT: This jack provides an unfiltered and
unbalanced line output of the Speaker Output signal. It
can be used to input the signal from the speaker output of
the STUDIOTONE-XL into the effects return jack of a
second guitar amplifier.
TO GUITAR AMP CLEAN INPUT: This unique output
provides the signal from the speaker output of the
STUDIOTONE-XL, while it is compensated for sending it
to the input jack from the Clean channel on any guitar
amplifier.
NOTE: Both these Line Outputs provide you with the
possibility to use a second guitar amplifier for increasing
the total volume of the STUDIOTONE-XL's sound. If the
second amp is a different amp (not a STUDIOTONE-XL) a
natural stereo sound can be realised if both amps produce
the same amount of volume.
It is also possible to connect an effects unit between one
of the Line Ouputs of the STUDIOTONE-XL and the
corresponding input of the second amp. This will open up
new ways for creating incredible stereo sounds.
NOTE: It is important that both amps produce their sound
IN-PHASE with each other. If they are NOT IN-PHASE the
speaker wires of one of the amps must be interchanged
(the + wire to the – lug of the speaker(s) and vice-versa)
NOTE: You can establish if both amps are IN-PHASE as
follows: Play through both amps simultaneously (without
external effects) and sit between them at ca. 1 meter
distance. If the sound seems to come from a point in
between the two amps, then the amps are correctly IN-
PHASE. If the sound seems to come from both sides, the
amps are NOT IN-PHASE.
NOTE: If the connection of a second guitar amplifier
to the STUDIOTONE-XL gives more hum, a ground-
loop may be the cause of it.
[7] PHONES OUTPUT: Provided for the connection of a
set of headphones. The signal is filtered in order to
simulate the sound coming from the speaker.
NOTE: A set of low/medium quality headphones will give
the best results. High quality headphones may sound to
shrill with distortion sounds as a result of their extended
frequency response.