ADDAC216 — Sum, Difference, Rectification, Inversion, Offset, and Averaging in 8HP ADDAC 216

Mint

• ADDAC216 Sum & Difference packs two fully independent signal-processing sections into just 8HP, making it a serious utility density play rather than a basic mixer.
• Each side gives you dual X/Y inputs with gain attenuverters, so you are not just mixing signals — you are actively weighting, balancing, and reshaping their interaction.
• Unlike a normal utility mixer, the 216 can sum or subtract two signals, opening up CV differencing and audio phase-cancellation tricks from the same core circuit.
• The switchable Absolute stage adds full rectification after the mix, turning bipolar material into aggressively usable unipolar energy on demand.
• Post-mix amplitude is handled by a dedicated attenuverter, so the final result can be boosted, tamed, or polarity-inverted without repatching upstream.
• An AC/DC coupling switch after the amplitude stage lets the same channel swing between CV precision and audio-focused signal treatment.
• Each section finishes with a bipolar offset control, which means the 216 can push modulation into exactly the range your destination actually wants.
• You get both normal and inverted outputs for each channel, so every processed result immediately exists in two complementary polarities.
• The dedicated Average output sums sections A and B together, effectively adding a third composite result on top of the two main channels.
• Feed only one X or Y input and the 216 converts into a dual attenuverter-and-offset processor with rectification and coupling options still in play.
• This module is explicitly designed for both audio and CV, so it can live equally well in modulation plumbing, phase work, tone shaping, or utility-heavy performance patches.
• Two polarity/gain-monitor LEDs per section make the circuit unusually playable, giving immediate visual feedback on what the processed voltage is actually doing.
• At 36mm deep, the 216 stays skiff-friendly while still delivering a multi-stage signal path that goes far beyond passive utility duties.
• Power draw is listed at 80mA on +12V and 80mA on -12V, a solid trade for how much active processing is packed into one 8HP panel.
• Made in Portugal and sold by ADDAC as the official ‘216 Sum & Difference,’ this is a purpose-built Eurorack processor for users who want deeper voltage math than a standard attenuator can touch.