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FISCHER AMPS
OPERATING INSTRUCTIONS
Guitar Genius
Dear customer:
You have decided to buy a
Fischer Amps
product. Thank you.
Please read this manual carefully prior to the first use, you will get important information for use
and safety of the unit. These safety and operating instructions should be retained for future
reference.
Should you have further questions, please do not hesitate to contact FISCHER AMPS.
Product Description:
Guitar amplifiers with a tube power amp are very popular but have the problem of having to be turned up to very
loud volumes in order to achieve that sound of power stage distortion we all love. The Guitar Genius allows to
drive the power stage of a tube amp to the maximum whilst still playing at suitable volume levels for at home, or
even silently using headphones or in-ear monitoring. The integrated Loadbox in the Genius Box exactly
reproduces the impedance of a 4x12 speaker cabinet and is more than just a simple load resistance. This is
crucial for the sound of the driven tube power stage. Optionally, the speaker cabinet can also be connected to
the Loadbox. It is then supplied with approximately 40% of the emitted tube amplifier signal with 12 different
switchable volume levels. The amplifier signal can be picked up from two transformer-balanced outputs on the
Guitar Genius via a speaker simulation of a 4x12 speaker cabinet with four switchable characteristics. The
"Line-Out" on the front panel is for direct connection to the "Aux-In" on the Fischer Amps In Ear Amp.
This way the guitar amplifier can be recorded or used for practice silently or at reduced volume. The guitar
setup on stage can also be operated at reduced volume or silently using the in-ear monitoring.
The combination of Fischer Amps In Ear Amp and the Guitar Genius allows to mix the guitar signal from the
amplifier with the "Stereo/Mono-In Ear Mix" or with a backing track for practice purposes. The Guitar Genius
has an additional XLR headphones out so that the Fischer Amps Guitar In Ear Cable can be used for the guitar
signal and the Stereo In Ear Mix.
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The features of the Guitar Genius:
• Guitar-Loadbox with reduced volume speaker output at 12 switchable volume levels with faithful
reproduction of the impedance of a 4x12 speaker cabinet.
• Toggle switch on the back panel for "Full Power" mode (without Loadbox)
• Speaker simulation with four switchable sound characteristics (vintage, classic, modern, scoop)
and two transformer-balanced line-outs.
• “Line-In" for connecting guitar preamp line signals
See below for two graphs which further explain the product description:
Impedance Curve of the Guitar Genius:
Frequency Curve of the Speaker Simulation:
Operating controls and connections on the front panel
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Description of the Operating Controls (Front Panel):
(1)
Front Panel Line Out
asymmetrical: Transformer-separated line-out for speaker simulator signal, for
instance, for connection to an optional Fischer Amps In Ear Amp. This
gives you the option of mixing the speaker-simulated guitar signal from
the amp with the In Ear mix or a backing track on the "In Ear Amp". The
output level depends on the output of the connected amplifier and
stands at –16dB. The output levels can be taken from the table in the
technical data for the Guitar Genius (see page 6).
(2)
Ground Lift
Front Panel Line Out: Disconnection of the line-out on the ground side in case of problems
with buzzing which may have been caused by a ground loop. The
"Ground Lift" is active when the button is pressed.
(3)
Sound Mode Selection Buttons
for Speaker Simulation: You can use both these buttons to set the four different speaker
simulation sound variations.
You can use these four extremely practical simulation variants to make
the appropriate preset for the particular amp sound you are looking for.
Simple, effective and free of any unnecessary gimmicks!
(4)
Volume Control
Guitar Cabinet When the Guitar Genius is used in Loadbox mode, you can use it to
direct approximately 40% of the actual output from the amp to the
speaker cabinet. You use the volume control to set the level of output to
the speaker cabinet to 12 switchable levels.
In the (0) position the speaker cabinet is completely switched off.
Position (1) achieves volumes suitable for at home when playing a 100
watt amp which is driven hard and loud. In position (12) approximately
40% of the total amplifier output is directed to the speaker cabinet - and
that's a great deal! The 12 levels are tapered logarithmically which
means that these 12 levels can cover a very large and practical range of
volumes.
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Operating Controls and Connections on the Back Panel
(1 )
Input for the
Amp Signal
Connect this Guitar Genius input to the speaker output on your guitar
amp. The Guitar Genius is equivalent to an impedance of 8 ohms,
therefore you should ideally use the 8 ohm output on your amp or set
the impedance switch on the amp to 8 ohms. If 8 ohms is not available,
it is better to use the 16 ohm output than the 4 ohm output in order to
ensure that the power stage output can be adapted and the power
stage can be loaded in the optimum manner.
It is imperative that you use speaker cable of at least 1.5 sqmm to
connect the speaker output.
You must not use a normal guitar cable for this purpose!
Otherwise you may cause considerable damage to your amp.
(2)
Toggle Switch: "Load Box" /
"Full Power" mode When this switch is in the "Load-Box" position, the Load-Box on the
Guitar Genius and the volume control on the front panel are both active.
This setting enables you to use your amp even without the speaker
connected to the Guitar Genius. For example, for recording or silent
practice, using just as set of headphones together with the Fischer
Amps In Ear Amp....
However, if you do get the chance to play on a 25m open-air stage, the
Loadbox on the Guitar Genius can be switched off completely ("Full
Power" mode). The full output from your amp is then directed to the
speaker cabinet (e.g. it will be really loud). You can of course continue
to use the speaker simulation and the two line-outs on the Guitar
Genius.
Important:
When set in the "Full Power" position, it is imperative that there is
a speaker cabinet connected to the Guitar Genius "Cabinet-Out" as
the power stage of your amplifier will otherwise become damaged.
(3)
Output to Speaker Cabinet Connect this Guitar Genius input to your speaker cabinet.
If you do not require a speaker cabinet, you can do without a speaker
cabinet when the switch is in the "Load-Box" position.
It is imperative that you use speaker cable of at least 1.5sqmm to
connect the speaker output.
You must not use a normal guitar cable for this purpose!
Otherwise you may cause considerable damage to your amp.
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(4)
XLR Line-Out
Transformer-balanced XLR line-out for the speaker simulation amp
signal for connecting to professional audio equipment. The output
impedance is 600 ohms, the output level depends on the output of the
connected amplifier and stands at –10dBV. The output levels can be
taken from the table in the technical data for the Guitar Genius (see
page 6).
(5)
Ground Lift
for back panel XLR Out Disconnection of the line-out on the ground side in case of problems
with buzzing which may have been caused by a ground loop. The
"Ground Lift" is active when the button is pressed.
(6)
Back panel Line-In The Guitar Genius also has an additional asymmetrical line-in jack so
that you can also refine signals from guitar preamps without speaker
simulation using the simulation sound of the Guitar Genius. The
maximum input level for this input is +10 dB.
The output levels can be taken from the table in the technical data for
the Guitar Genius (see page 6).
Important information:
When there is a plug in the line-in, the signals from the Loadbox
and the speaker simulation are automatically separated.
The Loadbox of course continues to function but no longer directs
a signal to the speaker-simulated line-outs.
Safety Instructions for the Guitar Genius:
The speaker cabinet on the amplifier side should be connected using suitable speaker cables. You must
not use instrument cables as they do not have a sufficient diameter and may burn through.
In extreme cases the Guitar Genius has to burn 120W, i.e. this much heat can be released into the
environment. Therefore, if you are rack-mounting the device, you should leave at least 10 mm of space
above it to allow air to circulate. The ventilation slots on the device must not be covered or sealed in any
way during operation as the device may otherwise overheat.
The Guitar Genius contains inductive components designed to reproduce the exact impedance of a
speaker cabinet. If the devices are installed unsuitably or in an unsuitable constellation, these components
may cause interference in a very susceptible device. In this case, try and make sure that the Guitar Genius
occupies the top spot in the rack. Even with a 19''-1HE combination of Guitar Genius and the In Ear Amp
the In Ear Amp should always be installed on the left and the Guitar Genius on the right (viewed from the
front).
In case you experience problems with buzzing due to a ground loop after connecting cables, the Guitar
Genius has a separate ground lift switch for each line-out of the speaker simulation signal.
The power stage valves and the preamp valve are of course subject to deteriorate more quickly when
driven heavily - as is the case in Loadbox mode. Accordingly, the power stage valves will of course have to
be replaced more frequently.
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Technical data
Guitar Genius
Dimensions: L x W x H: 220 x 190 x 43 mm
Weight: 2.5 kg
Frequency Response: See graph
Maximum Input: 120 watts music power (guitar amp signal)
Inputs: 1 x guitar amp in, 6.3 mm mono jack
1 x line-in, 6.3 mm mono jack
Outputs: 1 x guitar cabinet out (Loadbox)
1 x transformer-balanced speaker-simulated line-out, back panel (XLR)
1 x transformer-balanced speaker-simulated line-out, front panel (jack)
Output level to the
Line-Outs:
Input power
from guitar amp
XLR line-out Jack line-out
100W -10 dB -16dB
50W -13 dB -19 dB
30W -16 dB -22 dB
Line-in mode
Input level
+10 dB +5 dB -1 dB
+4 dB - 1dB -7 dB
0 dB -5 dB -11 dB
-10 dB -15 dB -21 dB
WARRANTY:
The manufacturer provides a 24 month warranty, starting from the date of purchase, for material and production
faults. The warranty shall be rendered null and void in case of improper use or modification of the device. If
returning the device, please enclose proof of purchase. Returns sent carriage forward will not be accepted.
Disposal of used electrical and electronic devices (to be applied in
European Union countries and other European countries with separate
collection systems for these devices)
The symbol on the product or its packaging indicates that this product
must not be treated as normal domestic waste and must be handed over
at a collection point for recycling electrical and electronic devices. You
help protect the environment and the well-being of fellow human beings
with your contribution to correct disposal. Incorrect disposal endangers our
environment and our health. Material recycling helps reduce the
consumption of raw materials. For further information on recycling this
product, contact your local authority, community waste disposal operations
or the shop where you bought this product.
FISCHER AMPS
HANS-ULRICH-BREYMANN-STR. 3, D–74706 OSTERBURKEN
TEL: +49 (0) 62 91- 648 79-0, FAX: 648 79 19
E-MAIL:
info@fischer-amps.de, Internet: www.fischer-amps.de
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Set-up suggestions:
Here are a few set-up suggestions for how you can best use the Guitar Genius, including
suggestions for use in conjunction with the Fischer Amps In Ear Amp and the Guitar In Ear Cable.
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