Colibri DAC DSD Test is a simple app that enables you to try different DSD playback modes such as DoP, DoPA and PCM.
Automatic Sample Rate Switching is also available with switchable fallback to highest supported sampling rate. A quintessential indicator whether your device properly communicates with CoreAudio. However, the DSD signal can not me modified in any way, otherwise your DAC will fail to properly recognize the signal as DSD.