The Tonelux OTB16, introduced in the mid-2000s, was part of Paul Wolff’s mission to bring the sound and workflow of large-format analogue consoles into compact, modular designs that could serve modern hybrid studios.
This Tonelux OTB16 16-channel, 1U summing mixer was designed around the famous Tonelux discrete summing bus, using the TX-240 and TX-260 op-amps together with the TX-100 output transformer to deliver the depth, clarity, and warmth that defined the Tonelux sound.
Each of the Tonelux OTB16’s 16 channels featured its own level control, panner with centre detent, and level indicator, while a LINK button allowed paired channels to be controlled together. Connectivity was straightforward, with two 8-channel balanced D-SUB inputs at +4dBu nominal level, making integration easy for studios working with multichannel DAWs and converters.
The main stereo output, adjusted by the master fader, was transformer-balanced on XLR connectors, while a pre-fader transformerless monitor output provided additional flexibility. For expansion, two extra balanced TRS inputs on the rear panel allowed multiple OTB16 units to be daisy-chained, supporting larger mixdowns across multiple stems.
With its compact footprint, robust build, and unmistakable Tonelux sonic character, the Tonelux OTB16 became a well-regarded solution for engineers who wanted the benefits of analogue summing without the size and cost of a full console.
Features
- 16 balanced inputs via two 8-channel D-SUB connectors (+4dBu nominal)
- Discrete summing bus with Tonelux TX-240 and TX-260 op-amps
- Tonelux TX-100 output transformer for rich analogue tone
- Channel controls: individual level, pan with centre detent, and level indicator
- LINK button on each channel pair for grouped control
- Master fader controlling transformer-balanced XLR outputs
- Balanced pre-fader monitor output (transformerless)
- Two balanced TRS inputs for daisy-chaining additional OTB16 units
- Compact rackmount format: 1U, 19-inch width
- Selectable mains power: 120V or 230V AC, 50/60Hz
