Otto Mikkonen
Features
Master Section
1. Unpack your NEW GADGET
The package comes with the Poltergeist module, a 10-pole
ribbon cable with connectors, a small bag with four screws
and washers for front panel mounting and this manual.
2. POWER CONNECTIONS
First off; be sure that the bus board of your system is un-
powered. Take the connector cable and insert it into the bus
board of your modular system. Be very careful when doing
so because it is easy to shift the connector and place it in-
correctly.
The red marked side needs to be connected on the lower side
of a Doepfer bus board and on the marked side of the module
(-12V rail). If attached correctly the keyed header will have
the right orientation for keyed power systems (e.g. uZeus).
Always make sure you align the red stripe on the power
connector to the red stripe marker on the module. To be extra
safe, make sure that the cable you are using is correctly
wired, which means that one connector faces up and the
other down when you hold the cable in front of you with the
flat side up. The Poltergeist consumes a higher current than
an average eurorack module. Make sure your power supply
can handle the current rating specified in the Technical
Specs.
3. POWER UP
Power up your system and check if all supply rails are up and
running (+/-12V), often there are indication LEDs on the bus
board showing if the rails are working properly.
4. Audio Connections
To connect the Poltergeist to a quadraphonic system, plug
the front left speaker into the top left jack, the front right
speaker into the top right jack, the rear left speaker into the
bottom left jack, and the rear right speaker into the bottom
right jack. In stereophonic mode, both left outputs and both
right outputs correspond to the left and right sides.
Dear KOMA user,
Thank you for purchasing the KOMA Elektronik
Poltergeist Analog Quadraphonic Audio Mixer / Panner
/ VCA. The Poltergeist is unlike any other eurorack
module that has previously existed. Previously
you would need multiple modules from various
manufacturers to achieve something similar to what
we perceive as quadraphonic sound. But now with
one single module, you can mix and control signals
quadraphonically with complete control and beyond.
Four channels each with it’s own VCA, plus a stereo
auxiliary input, are mixed out to four separate outputs
enabling you, the user, to manipulate signals both
stereophonically and quadraphonically in entirely new
and ghostly ways with its 21 ins and outs, 48 VCAs and
unique hands-on mixing features.
Here at KOMA Elektronik, we constantly want to push
the envelope of audio experimentation within the
hardware world for our users. Quadraphonic sound
itself has been around for a very long time but now
within your own eurorack system, you can easily pan
sounds completely around you and animate it spatially
to form four dimensional sonic atmospheres.
With performance in mind when designing the
Poltergeist, we included large Pan knobs for total
control over the 360 degree range field. Also,
clickless solo and mute buttons allow for effortless
and instantaneous changes on the fly. Beyond these
controls, you can also tailor your sound with extreme
detail using functions such as Slope, Field and Origin.
With just this mixer, some audio sources and a couple
of LFOs, extremely complex sound design can be
achieved.
The KOMA team has worked over two years on this
entirely new design as this module premiers our patent
pending analog method of controlling quadraphony
and mixing. Now hook up the Poltergeist to your
quadraphonic or stereophonic rig and get lost in a sea
of immersive sound!
Invented by our dear friend Erik Dower. Patent Pending.
All the best from Berlin,
The KOMA Elektronik Team
Getting Started
1 Signal input
(Audio Input)
AC coupled input for audio signal to
be mixed.
2 Gain
(Control)
Overall gain control of both Panned
and Field signals for each channel.
At unity gain when pot is completely
clockwise.
3 Field
(Control)
Adds an inverted version of the input
signal to all mixer outputs and does
not go through the VCA. When the
gain of this signal is equal to the gain
of the panned signal, they cancel
each other out.
4 Origin
(Attenuverter)
Sets controls how much pan modu-
lation is taken from the Master Origin
input.
5 Pan
(Control)
In quadraphonic mode, the control
pans over the entire 360 degree pan-
ning range. In stereophonic mode, it
pans between left and right chan-
nels.
6 MUTE
(Control)
Provides clickless muting of the
channel on release of the button
so you can press and hold it, then
release it at just the right moment.
7 SOLO
(Control)
Provides clickless soloing of the
channel on release of the button
so you can press and hold it, then
release it at just the right moment.
8 PAN
(CV Input)
Modulates the signal’s pan position
in the sound field. 0-8V covers the
entire 360° range.
9 PAN
(Attenuverter)
Sets the gain of the incoming CV
signal for panning.
10 VCA
(CV Input)
Controls the level of the vo ltage con-
trolled amplifier of the channel.
11 VCA
(Control)
Controls the amplitude of the panned
signal. With the pot set at 12 o’clock
no signal passes through the VCA.
The signal is unity gain with the
pot completely clockwise. With it
completely counterclockwise, there
is a -8v offset.
All CV inputs are 0-8V.
Depending on the Mode Switch setting the
outputs behave as such :
P0LTERGEIST
ANALOG QUADRAPHONIC
AUDIO MIXER
_
USER MANUAL
A
Mixer outputs
(Audio Outputs)
I
Master Gain
(CV Input)
Half-rectified, inverted CV input
where positive CV reduces the
Master gain and negative CV is
ignored. Designed to make your
own compressor using other
modules such as envelopes,
comparators, etc.
B
H
Master Gain
(Control)
Sets the maximum gain of the
signals on the 4 output jacks.
B
Auxiliary Stereo Input
(Audio Input)
Input directly to the summing
bus (pre master VCA) to add other
signals i.e. other mixers or effects
processors. When only one cable
is plugged into the left input, the
signal will go to all outputs. When
cables are in both inputs, the left
input goes to the outputs 1 and
2, and the right input goes to
outputs 3 and 4.
C
Master Origin
(CV Input)
CV input that goes to the Origin
control of each channel. It goes
through an attenuverter both
here and at each channel. Modu-
lating the Master Origin shifts the
entire scene.
D
Master Origin
(Attenuverter)
Sets the maximum amount of
shift the CV signal can have at
any channel. Inverting the signal
will reverse the direction of shift.
E
Slope
(CV Input)
Creates variations in the anima-
tion of the signals on all chan-
nels. Has a 0-8V range.
F
Slope
(Control)
Controls the curve of the pan or
how long it remains at one output
before going to the next. With the
pot clockwise, the signal remains
at the output longer and then
very quickly jumps to the next
much like a switch. With the pot
counterclockwise, the signal
stays at the output for a short
time before the volume reduces
and begins moving to the next.
The panning is linear around 10
o’clock
G
Mode Switch
(Control)
Switches between stereophonic
and quadraphonic modes.
Warranty
KOMA Elektronik warrants its products to be free of defects in materials / workmanship and conforming to specifications at
the time of shipment for a period of two years from the date of purchase. During the warranty period any defective products
will be repaired or replaced at KOMA Elektronik’s option on a return-to-factory basis. This warranty covers defects that KOMA
Elektronik determines are no fault of the user.
RETURNING YOUR PRODUCT?
You must obtain prior approval in the form of an RMA (Return Material Authorization) number from KOMA Elektronik before
returning any product. Get in touch with us at [email protected] to request the RMA number. All products
must be packed carefully and shipped with the KOMA Elektronik supplied power adapter. Sorry, the warranty will not be
honored if the product is not properly packed. Once you have received the RMA#, write it on the box together with the
word: WARENRUCKSENDUNG and carefully pack your product, ship the product to KOMA Elektronik with transportation and
insurance charges paid, and include your return shipping address.
PAN CV voltage
Use an 8v rising sawtooth waveform into the PAN CV
input and set the pan to around 10 o’clock to achieve 360 degree panning.
0V corresponds to Quadrant 1, 2V to Quadrant 2, 4V to Quadrant 3,
6V to Quadrant 4 and 8V goes back to Quadrant 1.
FIELD GHOSTING EFFECT
Use the Field control to create a hole in the sound field that can be moved around with the panner, a sort of ghosting effect.
Aside from being a novel effect on its own, you can place other sounds in the hole. This is particularly useful when you want
to carve out a unique space for sounds with a similar spectral content.
SLOPE MODULATION
Remember that the slope control changes the pan response of all channels, so once you have a repeating gesture defined,
you can adjust/modulate the slope to vary the pattern. For more extreme variation, try running your modulation signal
through distortion, wavetables, delay, frequency shifter, or other effects. This can also act as a kind of intensity or density
control for the mix, bringing up the energy to the right and thinning it out to the left.
Tips & Tricks
Imprint
KOMA Elektronik GmbH
is a subsidiary company of KOMA Elektronik B.V.
Managing Director: Christian Zollner & Wouter Jaspers
Registered Office: Berlin, Germany
Court of Registration: Amtgericht Berlin-Charlottenburg
Registration Number : HRB 145453
VAT ID: DE285522050
KOMA Elektronik GmbH
Mahlower Strasse 24
12049 Berlin-Neukölln
Germany
Technical Specifications
CASING
2mm aluminum front panel, powder
coated white with silkscreen
printing.
DIMENSIONS
3U Eurorack module, 28HP wide,
54mm deep
SHIPPING WEIGHT
500 grams / 1.1 lbs
CONNECTORS
6 audio inputs,
4 audio outputs.
11 CV inputs
POWER REQUIREMENTS
510 mA @ +12V
Peak +580 mA @ +12V
Normal -460 mA @ -12V
Peak -490 mA @ -12V
Lower Left
Upper Left
Upper Right
Lower Right
Quadraphonic
Quadrant 1
Quadrant 2
Quadrant 3
Quadrant 4
Stereophonic
Left
Left
Right
Right
