Audison bit C2O Coaxial to Optical Digital Converter — Hi-Res Digital Interface with AUX Input

The Audison bit C2O is a compact Hi-Res digital interface that converts a coaxial digital input and an analog AUX input into a TOSLINK optical digital output. It lets Hi-Res portable players with a 75Ω coaxial digital output, and smartphones with a 3.5 mm analog output (including 4-pole jacks), connect to Audison processors that have an optical digital input.

Key Features

• Coaxial digital input (electrical S/PDIF) up to 24-bit/192 kHz, with an isolation transformer to reduce EMI noise
• Analog AUX input (3.5 mm mini jack, including 4-pole) with an adjustable 0.1 V – 2 V preamp
• TOSLINK optical output: up to 24-bit/192 kHz from the digital input, 24-bit/48 kHz from the analog input
• Switches to the coaxial input after a set time without an analog signal (6 seconds by default; 6, 9 or 12 seconds selectable)
• High-quality 24-bit/48 kHz analog-to-digital converter
• Extremely compact, suitable for a hidden dashboard install

Power and Technical Highlights

The coaxial input's isolation transformer improves the balance between transmitter and receiver circuits and reduces electromagnetic interference, which is a common problem inside a car cabin. The C2O meets the Japan Audio Society's 24-bit/96 kHz conversion requirement for Hi-Res audio. The AUX input has priority: with the default setting, the unit moves to the coaxial input after 6 seconds without an analog signal.

Ideal For / System Fit

• Adding a Hi-Res portable player with a coaxial digital output to an Audison processor
• Connecting a smartphone's 3.5 mm output to a processor's optical input
• Systems built around bit One HD Virtuoso, or amplifiers with an optical input

Only converts signals; it does not process or amplify audio. The receiving processor must have an optical input that supports the incoming resolution.

Installation Note

Connect the coaxial and/or AUX source to the C2O, then link its TOSLINK output to the processor's optical input. Set the digital-input delay switch (6, 9 or 12 seconds) to suit how you use the two inputs.

What's Included

1 x Audison bit C2O coaxial to optical converter (confirm the supplied cables with your supplier)

Precautions

• The receiving processor's optical input must support the signal's resolution
• Analog sources are converted at 24-bit/48 kHz, not 192 kHz
• Set the AUX preamp gain correctly to avoid distortion or low signal level
• Professional installation is recommended for a hidden dashboard fit

Audison bit C2O vs. Direct AUX Connection

Frequently Asked Questions

What is the Audison bit C2O used for?
It converts coaxial digital and 3.5 mm analog signals into a TOSLINK optical signal for Audison processors.

What resolution does it support?
Up to 24-bit/192 kHz from the coaxial digital input, and 24-bit/48 kHz from the analog AUX input.

Can I connect a smartphone?
Yes, through the 3.5 mm AUX input (4-pole jacks are supported).

Can I connect a Hi-Res player?
Yes, if it has a 75Ω coaxial digital output.

How does it choose between inputs?
The analog AUX input has priority, and after 6 seconds without an analog signal (by default) it moves to the coaxial input.

Can I change the switching delay?
Yes. A switch selects 6, 9 or 12 seconds.

Why does the coaxial input have a transformer?
To reduce EMI noise, which is common in a car cabin.

Is it Hi-Res compatible?
Yes. It meets the Japan Audio Society's 24-bit/96 kHz conversion requirement.

Product Specifications

Connect any Hi-Res source to your Audison processor — order the Audison bit C2O today.