ADDAC System 806 (2015–Present)
Bluetooth audio in, stereo VCAs out, in a small Eurorack module.
Overview
The ADDAC 806 takes audio from a phone over Bluetooth and puts it into a modular at Eurorack levels. No USB, no adapters, no laptop. It came out in 2015, when Bluetooth was still seen as sketchy for pro audio, a gimmick more than a tool. ADDAC added preamps to condition the signal for modular use, plus dual VCAs so you can shape the left and right channels separately with CV. It's an active gateway, not a passive bridge. You can modulate the volume of a Spotify stream with an LFO or duck a podcast behind a kick drum.
Purists might scoff at wireless audio in an analog rack, and the 806 doesn't pretend to be transparent or clinical. The signal path has preamps that bring consumer-level Bluetooth output up to modular line levels. It then splits into stereo channels, each feeding its own VCA. Those VCAs let you treat incoming audio like any other modular source and process it with envelopes, sequencers, or random voltages. A beat from a YouTube clip that only plays when a gate fires works. So does a crossfade between two streaming tracks using a slow LFO. The module is 6HP wide and has a modest power draw.
Specifications
| Manufacturer | ADDAC System |
| Production Years | 2015–Present |
| Module Type | Bluetooth Audio Interface |
| Format | Eurorack |
| Width | 6HP |
| Power Consumption | 100mA @ +12V, 20mA @ -12V |
| Inputs | Bluetooth wireless audio (stereo) |
| Outputs | Stereo audio (L/R, Eurorack level) |
| CV Inputs | 2 x VCA CV inputs (one per channel) |
| Controls | 2 x VCA attenuation knobs (per channel) |
| Signal Path | Bluetooth receiver → preamp → stereo VCA |
| Indicators | 2 x Bluetooth status LEDs, 2 x signal level LEDs |
| Special Features | Direct Bluetooth streaming to modular, CV-controllable stereo VCAs |
| Front Panel Options | Custom color panels available by request |
| Availability | Made to order through manufacturer |
Key Features
Wireless Signal Injection with Full CV Control
The 806 isn't an audiophile-grade converter, and it doesn't claim to be. The Bluetooth receiver pulls in stereo audio from any compatible device - phone, tablet, laptop - and converts it to a signal that works at Eurorack levels. Each channel then goes through its own VCA, with a dedicated CV input and a manual attenuation knob. That means you can modulate the volume of a streaming track with an envelope follower, fade between two sources using a sequencer, or gate a vocal sample in time with your clock. The VCAs behave like any other in your system, so the audio becomes a dynamic element and not just a playback track.
Minimal Footprint, Maximum Utility
At 6HP, the 806 doesn't take much space. The front panel has two VCA level knobs, four LEDs (two for Bluetooth status, two for signal presence), and the ADDAC logo. There are no tone controls, no filters, no effects. It's a conduit, not a processor. It's made to order directly from ADDAC, so you can request custom front panel colors, which stands out among all the black and gray modules.
Real-World Integration Over Spec-Sheet Perfection
Bluetooth has latency. It's lossy. It's not "high fidelity" by studio standards. The 806 isn't meant to replace your audio interface for recording. It's meant for sketching, sampling, and live manipulation. The preamps boost the incoming signal to modular levels, avoiding the noise floor issues that plague passive adapters. The stereo separation is clean, and the VCAs respond smoothly to control voltages. It adds a slight softness, almost like a warm tape bias, which can help when you're feeding digital streams into an analog system. It rounds off the harsh edges of compressed audio, so YouTube rips or MP3s sit better alongside oscillators and filters.
Historical Context
The ADDAC 806 launched in 2015, when Eurorack was deep in its analog renaissance and builders and players cared about purity, patchability, and hands-on control. Wireless tech was still seen as flaky, unreliable, and sonically compromised - something for consumer gadgets, not serious instruments. ADDAC, a Lisbon-based boutique known for blending digital brains with analog charm, sidestepped that bias. The 806 wasn't marketed as a high-res audio solution. It was sold as a creative tool, a way to connect your digital life to your modular rig. Most audio input modules at the time required cables, SD cards, or USB hubs. It arrived alongside other hybrid experiments like the ADDAC112 looper/granulator. It wasn't the first to bring external audio into modular, but it was the first to do it wirelessly with CV control built in. Competitors like Intellijel and Mutable Instruments focused on internal generation or high-precision processing.
Collectibility & Value
The ADDAC 806 isn’t a vintage classic in the traditional sense—it’s still in production, but only made to order through the manufacturer, which means availability is spotty and secondary market prices can creep up. On Reverb or eBay, expect to pay between $250 and $350 for a used unit, depending on condition and whether it includes any custom panel options. Because it’s not mass-produced, every unit feels slightly special, and collectors of ADDAC’s more obscure hybrids often seek it out as a conversation piece. That said, it’s not a “must-have” for every rack—its utility is situational. If you compose with field recordings, sample-heavy textures, or collaborative audio drops, it’s invaluable. If you’re strictly into self-contained synthesis, it might gather dust. Reliability is generally good, but Bluetooth modules from this era can occasionally have pairing issues or firmware quirks—though ADDAC has historically supported their products with updates and direct customer service. The biggest risk isn’t failure, but obsolescence: Bluetooth standards evolve, and future devices might drop support for older profiles. Still, as long as your phone can pair with a wireless speaker, the 806 will likely keep working. For those who value workflow fluidity over sonic perfection, it’s a quiet revolution in a 6HP shell.
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