Marmitek Connect DA21 Digital-to-Analog Audio Converter

Connect your modern TV, game console, or media player with only optical or coaxial digital audio output to an older amplifier, receiver, or powered speakers that accept analog stereo RCA or 3.5mm input. The Marmitek Connect DA21 converts uncompressed PCM digital audio (up to 192 kHz/24-bit) to clear analog stereo, making it ideal for integrating new digital sources into existing analog audio setups in living rooms, home theaters, or desktop audio systems.

Key specifications

• Digital inputs: 1x Optical (Toslink), 1x Coaxial (RCA)
• Analog outputs: 1x Stereo RCA (L/R), 1x 3.5mm jack
• Supported audio format: LPCM/PCM (2-channel uncompressed)
• Maximum sampling rate: 192 kHz
• Maximum bit depth: 24-bit
• Frequency response: 20 Hz - 20 kHz
• Signal-to-noise ratio: > 90 dB
• Total harmonic distortion: < 0.005%
• Channel separation: > 80 dB
• Power supply: 5V DC via USB (USB power cable included)
• Power consumption: < 0.5W
• Casing material: Aluminum
• Plug & Play: Yes

Why choose it

This converter preserves audio quality with high SNR and low distortion, and its aluminum casing ensures durability. It requires no driver installation—just connect and play. The dual digital inputs allow switching between two sources, and dual analog outputs offer flexible connection options.

Ideal use cases

• Connecting a TV with optical output to an older stereo amplifier
• Adding digital audio capability to a legacy receiver with RCA inputs
• Using a game console with coaxial output with desktop speakers
• Integrating a digital audio source into a whole-home audio system

Good to know

This converter does not decode Dolby Digital, DTS, or AC3. Ensure your source device is set to output PCM stereo for proper operation. Power is supplied via USB, so a USB power adapter or a powered USB port is required.