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Studio Electronics SEM

MFR# SEM
Studio Electronics SEM
Oberheim toned voltage controlled multi-mode filter Eurorack module
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$249.00
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Description

Sensei Caswell: "The Studio Electronics SEM is known as a 'Voltage Controlled State Variable Filter' because it provides simultaneous high pass, low pass, and band pass outputs, all with a 12 dB/oct slope. The notch is the inverse of the bandpass, achieved by summing the low pass and high pass outputs. This version is a combination of the original SEM filter and the newer design from the OBX, along with improvements by SE. It has a modest current draw, which it pulls evenly from the plus and minus rails."

If you've heard the SEM filter in the Boomstar desktop, you also know that this 12 dB favorite is capable of lighter, more subtle tones than the other three models. This isn't to suggest the filter's Low Pass mode can't cater for fat and punchy, because it can. Looking for deeply gratifying tonal variance and this emotional warmth? our friend Fred Falke's favorite—it can reach into your head and heart, and stay as long as desired. Thank you Lord Tom Oberheim for this marvelous design/template from which we were able to work our very own Studio Electronics Eurorack filter enchantments—we do like to hit our SEM a bit harder though ;)

Tim Caswell on the easy bonking: "Right. This filter is a 'State Variable' circuit, which is an analog computer model of a pendulum. When the resonance is increased, the "damping" or stabilizing of the circuit is actually decreased. This makes the pendulum swing more wildly. If it is hit hard enough, it will swing all the way to one side and 'stick' there, what we call 'bonk out'. Greg likes the sounds that can be gotten as it goes into and out of 'bonk out', so, against my objections, we have not made the filter 'idiot proof' by limiting the input level and resonance amount. If you don't like it, limit your input level and/or resonance amount. Otherwise, go wild! It won't hurt the circuit. TC"

Marc St. Regis on fear and flammability: "Fear not, your SEM is not broken; it does not lie bleeding and battered; distortion is not flammable; you can and will—must—survive this "strange design decision" and all will be right with your 12dB filtered world, biscuits and all. More sound creation possibilities = more better design realities ;) MSR"

Potentiometer Potential

Three attenuverter and four attenuation pots control the FREQUENCY, RESONANCE, FREQ CV 1, RESO CV, LP HP, INPUT and OUTPUT, delivering smooth, detailed, and complex expression.

Switch it Up

FULL and HALF strength filter frequency keyboard/voltage tracking, and BP / LP-HP modes.

Patch it Up

Seven patch points: 1 V/O, FREQ CV 1, FREQ CV 2, RESO CV, INPUT, BP LP-HP, and OUTPUT direct the deepest manipulation.

All Controls and Patch Points

  • FREQUENCY – Adjusts the frequency, or cut-off of the filter.
  • RESONANCE – Adjusts the resonance of the filter.
  • FULL HALF TRACK – Switch between full and half keyboard/voltage tracking.
  • FREQ CV 1 – Frequency control voltage 1 input attenuverter.
  • RESO CV – Resonance control voltage input attenuverter.
  • LP HP – Low Pass / High Pass attenuverter.
  • INPUT – Adjusts the audio input.
  • OUTPUT – Adjusts the audio output.
  • 1 V/O – One volt per octave control voltage input.
  • FREQ CV 1 – Frequency control voltage 1 input.
  • BP OUT – Band Pass Output. No cable patched, BP passes through the mains.
  • RESO CV – Resonance control voltage input.
  • INPUT – Audio input.
  • BP LP-HP – Switch between Band Pass and Low Pass - High Pass modes.
  • OUTPUT – Audio output.

Power Usage - 32mA (+12 / -12)

Technical Specifications

Additional Information

Condition New
Chassis Eurorack Modular
Input Connectors 3.5mm TS
Output Connectors 3.5mm TS
Module Slot Count 12hp
Connector Type 3.5mm
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