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It is a relatively recent digital audio format that aims to capture the sound of the original studio master recording. MQA stands for Master Quality Authenticated. For consumer purposes, PCM bit-depth generally ranges from 16 to 24 bits, with sample rates up to 192 kHz and higher, and it also has multichannel audio capabilities. Popular high resolution audio formats such as Dolby TrueHD and DTS-HD Master Audio decode into PCM as well. It is an uncompressed digital audio that is found in CDs, DVD-Audio discs, and digital audio file formats such as WAV, FLAC and ALAC. When Super Audio CD (SACD) was introduced, DSD became widely available to consumers as it was chosen to be the encoding format for SACD. DSD64 is the most common variant of the format, but there are also DSD128 and DSD256 variants available, in which the sample rate is either doubled or quadrupled, respectively. It generally has a bit-depth of 1-bit, and a sampling rate of 2.8224 MHz, which is 64 times the sampling rate of CD Audio at 44.1 kHz, and as such is often referred to as DSD64. It was originally developed for the purpose of archiving analog master tapes. Over the past few years, high resolution audio downloads have become increasingly popular, with sites such as HDTracks, NativeDSD, Acoustic Sounds, and HighResAudio offering downloads in high resolution DSD, PCM, and now MQA formats.ĭSD stands for Direct Stream Digital.