The following troubleshooting tips can help diagnose and correct most concerns with the D2. We have attempted to make this list as comprehensive as possible, so some of these may not apply to your issue, but please go through each tip.

1. First, restart your computer and make sure your computer’s OS and all related apps are up-to-date.
2. Make sure all of your connections are complete and all cables are in working order by unplugging the cables and then reconnecting.  Try using the included USB cable if you are not already.
3. Power your D2 sender with and without the external power adapter to see how this affects your issue.
4. Remove all other USB devices temporarily to see how this affects the problem.  Audio over USB requires a lot of bandwidth.  USB ports can share a bus internally and can also share their bus with devices internally as well.  Because of this some ports may not perform with full bandwidth, so try to make sure the D2 is on a bus all by itself.
5. Try different bit depths and sample rates.  On a Mac these settings are under Applications –> Utilities –> Audio MIDI Setup.  Try using both 16-bit as well as 24-bit.
6. Try using a different media player (iTunes, Windows Media Player, WinAmp, etc) and file types (MP3, ALAC, FLAC, etc).
7. If you’re using the optical input on your D2 be sure your source (computer, TV, CD/DVD player, etc) is set to PCM Stereo output and not Dolby Digital or DTS.
8. Try your D2 in a different location to see if something is causing an issue in the current setup.  Something as simple as a wireless internet router, cordless or mobile phone, or halogen lamp near the speakers may be causing interference in your setup.

D2 troubleshooting tips – USB DAC

Try these tips if your computer is not recognizing the D2 the USB input or the sound through USB isn’t functioning correctly:

If you are using Windows, uninstall the USB driver from your computer.  Then disconnect the USB cable to remove the D2 from your computer and plug it back in to allow the driver to re-install automatically.  You can find instructions from Microsoft on how to reinstall a plug-and-play device under Windows here.

If you are using a Mac, try a NVRAM/PRAM reset.  This resets the system configurations for some audio and video related things and can many times help clear up problems related to audio.  See Apple’s support page for information on how to do this. Also, be sure to check the App store to see if there’s a newer version of Mac OS you could be running.

D2 troubleshooting tips – wireless interference issues

1. Try changing the channel of your Wi-Fi router to 1 or 11. This can be done with an Apple router using Apple’s Airport Utility software.  On most other routers, these settings can be accessed by logging onto the router’s IP address through a web browser.
2. Keep as much room between the D2 sender and receiver units and other wireless devices as possible.  At least 2 or 3 feet is recommended.
3. Try temporarily moving the powered D2 sender unit as close as possible to your wireless router.  Leave it there for just a few minutes and then place it back into your setup and retest.  This may allow the D2 to train itself to “steer clear” of the signal.
4. We have found that every now and then the placement of the computer’s antenna in relation to the USB port can have an effect on the D2.  One thing you could try is to move the D2 further from the computer by using a USB extension cable.  If using a Mac laptop, try the USB port furthest away from the display (which is generally where the wi-fi antenna is located).
5. Also consider upgrading to a new wireless internet router if yours is older than 3 or 4 years.  Newer model routers handle interference much better than older routers.