Eurorack Module
X
4-Quadrant Multiplier
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Ring or amplitude modulation
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Voltage controlled amplification
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Exponential conversion
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Wave shaping
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Dynamic expansion
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One input with adjustable level and offset control
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Works both with audio and CV signals
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Red LED for overdrive indication
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Easy to use
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Width: 6 HP
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Dimensions: 128,5 mm x 30,2 mm
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Depth: 35mm
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Supply voltage: ±12V
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Current: +12V: ≈33mA; -12V: ≈31mA
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Optionally with banana or 3,5mm minijack
The X is a versatile 4-quadrant multiplier module usable for ring modulation, VCA, waveshaping and much more.
The two input voltages ‘X in‘ and ‘Y in‘ are being multiplied together, resulting in the multiplication product voltage ‘W out‘ (which is internally attenuated to keep the signal within the working range).
» read more
If audio signals are being used for both inputs, the result will be a ring modulation. If a CV is applied to one input and an audio signal to the other one, the CV will control the amplitude of the audio signal (like a VCA) or will invert it (if the CV is negative). If CVs are applied on both inputs, one CV will modulate the amplitude and polarity of the other one.
‘4-quadrant’ means that negative modulation voltages can be processed too, with the result of an inversion of the modulated signal.
Input ‘X in‘ is equipped with additional control functions:
The knobs ‘Level’ for adjusting the input amplitude (amplification max *3) and ‘Offset’ to add an offset (DC) voltage in the range from ca. -5V to +5V to the input signal (whereby a ‘dry/wet’ control for the ‘Y in‘ or a zero-point shift of the ‘X in‘ can be achieved too).
Furthermore, the switches ‘inv‘ for inversion of the ‘X in‘ input and ‘lin/exp‘ for a exponential conversion (hereby the X is working in 2-quadrant mode, meaning that only positive voltages from X in will be processed, which is adequate to rectifying behaviour). The ‘exp‘ modus suits well for loudness-correct VCA applications.
Further, the input ‘X in‘ has a red LED for indicating an eventual overdrive.
The 2nd input ‘Y in‘ is intentionally made without any additional control elements, to keep the complexity of the module as low as possible. » read less
» read more
‘4-quadrant’ means that negative modulation voltages can be processed too, with the result of an inversion of the modulated signal.
Input ‘X in‘ is equipped with additional control functions:
The knobs ‘Level’ for adjusting the input amplitude (amplification max *3) and ‘Offset’ to add an offset (DC) voltage in the range from ca. -5V to +5V to the input signal (whereby a ‘dry/wet’ control for the ‘Y in‘ or a zero-point shift of the ‘X in‘ can be achieved too).
Furthermore, the switches ‘inv‘ for inversion of the ‘X in‘ input and ‘lin/exp‘ for a exponential conversion (hereby the X is working in 2-quadrant mode, meaning that only positive voltages from X in will be processed, which is adequate to rectifying behaviour). The ‘exp‘ modus suits well for loudness-correct VCA applications.
Further, the input ‘X in‘ has a red LED for indicating an eventual overdrive.
The 2nd input ‘Y in‘ is intentionally made without any additional control elements, to keep the complexity of the module as low as possible.
» read less
Soundfiles
Ringmodulation of synthesizer and rhythm machine
X in: Korg MS-20 filtered VCO and noise with different filter settings;Y in: Rhythm machine
Ringmodulation of rhythm machine and trumpet
X in: Rhythm machine; Y in: Preamplified trumpet; different X Offset settings
Ringmodulation of rhythm machine and cymbals
X in: Rhythm machine; Y in: Preamplified cymbals; different X Offset settings
Stereo panorama control with 2 X modules X in 1: triangle/squarewave, X in 2: triangle/squarewave inverted;
Y in 1+2: Rhythm machine / VCO
Envelope shaping with 2 X modules X in1+X in2: trianglewave; Y in 1: VCO; Y in 2: Noise
In exponential mode, depending on X Offset and X Level settings, different modulation waveforms can be achieved.
Noise modulation with 2 X modules and Delay1022 Xin1+Xin2 (exponential mode): pink noise, Yin1: white noise; W out1: Delay In
Y in2: +10V DC voltage W out2: Delay time CV input
Multiplier 1 (modulating white noise) is followed by the delay (delay time modulated by multiplier 2)
Or listen on
https://soundcloud.com/cg-products/sets/x
X Banana Versions
All CG-Products modules can be also manufactured equipped with banana sockets. Functions, technical specifications and dimensions (3U) are identical to those of the minijack version.
Two different color styles are available:
Please note: Most CG-Products banana modules have no extra grounding socket. We recommend to use the PCV-2 for proper ground connection with external equipment!
Block Diagram
Examples (linear mode)
Linear mode: switch ‘lin/exp.’ in upper position
X in or Y in = 0 ⇨ W out = 0 | X in polarity ≠ Y in polarity ⇨ W out = negative | |||||
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X in | 0 | ± | + | + | − | − |
Y in | ± | 0 | + | − | + | − |
W out | 0 | 0 | + | − | − | + |
X Offset | X in | Y in | W out |
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0 | ![]() |
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+2 | ![]() |
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+4 | ![]() |
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Examples (exponential mode)
X Level: ≈3 (≙ X in amplification ≈ 1); exponential mode: switch ‘lin/exp.’ in lower position
X Offset | X in | Y in | W out |
+3,5 | ![]() |
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Due to the rectifying characteristic of the exponential mode, with different settings of the X input level and X offset several modulation shapes can be achieved for Y in (Y in: +10V DC voltage)
X Offset | X in Level | X in (ca. 8V pp) | W out |
+3,5 | 1 | ![]() |
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+2,5 | 2 | ![]() |
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0 | 4 | ![]() |
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-4 | 7 | ![]() |
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