![]() For reliable 24-bit/192kHz transfer, short USB 2.0 (or better) or coaxial cable connections are recommended. In general, you should be using short, high-quality (though not necessarily expensive) cables. Long optical cables may cause issues with high data rates.Using a USB connection will circumvent this. This is also the case for many PCs: even if the PC claims to produce higher data rates than 24-bit/96kHz from the optical output, the BIOS or drivers may not enable it.To circumvent this, you can use a USB to connect your DAC. If you’re using a Mac, that may be as high as you can go with the onboard optical output. Historically, Apple computers haven’t allowed data rates above 24-bit/96kHz from the optical digital output.If you want to hear your high-res audio files in all their glory and your DAC isn’t playing along, there are a few caveats to be aware of in this instance specifically. They can employ mechanical switching relays, which click when the digital audio stream is interrupted. Some DACs produce mechanical clicks from inside the case during normal operation. What to do about audible clicks when changing sample rates or pausing playback Avoid front panel USB ports on the case if possible, since these may be of low quality. For desktops, it’s better to connect your DAC to USB ports in the back (directly to the motherboard).Since some PCs only house USB 3.0 ports: always keep USB drivers up to date to ensure they are backwards compatible with USB 2.0. It’s also a good idea to reserve the hub for the DAC alone. This will supply ample power to the DAC that the underpowered USB ports just can’t deliver. Another simple solution is to add an externally powered USB hub between your computer and your DAC. Here are instructions for PC users and Mac users. You may be able to solve this by disabling port power management in system settings. Sometimes, in their infinite wisdom, both Windows and macOS can suspend operation or only allow low power from USB ports. Your DAC may be plugged into a low-power USB port. ![]() Note: this section can also apply to headphones that connect directly to your PC via USB, if you’re having similar troubles. What to do if your DAC keeps disconnecting or is not recognized If you’re using an SACD player as your digital source, be aware that Sony owns the SACD format and mandated that the digital output from an SACD transport must be encrypted (as well as the audio on the disc itself).Try connecting a different digital source if you have one.For the purpose of troubleshooting, if you don’t have another 75Ω coaxial cable, you can substitute a regular RCA (phono) interconnect cable. Try a different optical or coaxial cable.If your DAC has multiple inputs, check that it is switched to receive the correct one.A simple way to check if an optical digital output is active is to look for the red light coming out of it. Confirm you’ve connected the digital output from your source and that it is functional.Sometimes restarting the playback application is necessary. If you’re using a computer as your source, make sure you’ve selected the DAC as a USB output device or selected the computer’s S/PDIF output (depending on how you have it connected) in both the Control Panel (System Preferences) and in your audio playback software.Here’s what to check for and what you should try to fix the problem. You’ve connected your digital source to your DAC, and your DAC to an analog output device such as a headphone amplifier and some headphones, or an amp and some speakers, but you’re not hearing anything. What to do if there’s no output from your DAC Before you reach for your credit card (or a hammer), here are some ways you might be able to fix your Digital to Analog Converter (DAC) first. And like many things in life, adding computers to the mix can complicate issues. Glitches, clicks, crackles, and pops, or no sound at all-digital audio can have its moments.
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