ADDAC 812A LED Audio Meter ()
A small twin-column LED meter for a modular rig. It shows what voltage is getting through and when it is about to clip.
Overview
The ADDAC 812A LED Audio Meter doesn't generate sound, shape it or modulate it. It just watches and reports back in bright light. It belongs to ADDAC Systems' range of Metering Tools, and it is a 4 HP module, so it fits into a crowded rack. Two channels mean you can monitor a stereo signal, or run two separate processing chains side by side, say a filtered lead and its dry counterpart, and see how much level you lose (or gain) at each stage.
Owners report using it as a quick and useful visual indicator for checking audio attenuation levels by voltage, which sounds clinical until you’re in the weeds tweaking a compressor patch and need to know whether that -6 dB drop is actually happening. It’s not a VU meter in the traditional needle-swinging, “warm analog dance” sense — it’s digital, direct, and a little more urgent. But there’s still a certain charm in those 11 pairs of LEDs lighting up in sequence, especially when someone on MOD WIGGLER admits, “if something has VU meters on I instantly like it and I want to buy it.” Even when it’s not a VU meter. Even when it’s LEDs. The appeal is visual, immediate, and slightly obsessive — which, let’s be honest, describes most of us who run Eurorack systems in the first place.
Specifications
| Manufacturer | ADDAC Systems |
| Product Type | Dual LED meter, Stereo/dual audio meter |
| Width | 4 HP |
| Depth | 40mm |
| Range | 0 V to +10 V |
| Number of LED indicators | 11 pairs of LED |
| LED color scale | Green lights go up to 5V, yellow almost reach 10V and 10V is red, indicating peaking. |
| Outputs | Buffered thru outputs for each channel. |
Key Features
Visual Voltage Mapping
With 11 LED pairs per channel, the 812A reads from 0V all the way to +10V, the full operating range of most modular gear. The color-coding is simple. Green covers the safe range up to 5V, yellow takes over at hotter levels, and red flashes at the top end to warn of peaking. The response is linear, not logarithmic like a VU. That makes it better for catching transient spikes or verifying calibration than for judging perceived loudness. In a system where a +8V spike can clip a mixer or distort a sample playback module, that is a feature, not a flaw.
Signal Thru Without Degradation
Each channel has a buffered thru output. You patch in, the meter reads, and the signal continues downstream, buffered and intact. You don't break the signal chain to monitor it. That means you can leave the 812A patched in-line on critical signals without loading down an oscillator or attenuator earlier in the chain.
Historical Context
The ADDAC 812A came out as part of ADDAC Systems' new range of Metering Tools, a set of modules built for visibility rather than sound generation. The wider family includes the ADDAC 812V, ADDAC 812VU, and the current-sensing ADDAC 200A. The 812A fills a specific niche: voltage-level monitoring for audio-rate signals. As systems became more complex, demand for diagnostic tools increased, and ADDAC answered with clean, functional meters.
Collectibility & Value
At least one major retailer, Schneidersladen, lists the ADDAC 812A as archived and "not available anymore," so it's now a secondhand item. At the time of listing, one retailer (Soundria) offered it for €144, which gives a rough baseline for what it once cost. Original MSRP and production dates remain unconfirmed. There's no data on common failures or maintenance issues, likely because the module is solid-state and relatively simple. Used units may occasionally surface on forums or reseller sites. One user mentioned checking analoguehaven for stock, implying it was available there at some point.
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