MP3s feature small file sizes but relatively low sound quality.
MP3 (standard): Mentioned above, the extremely common MP3 file uses lossy compression and is the workhorse of the audio file world-it gets the job done, but isn’t extremely sexy. Adding channels to an audio file typically doubles that file in size: A 10 MB mono file will take up 20 MB in stereo. 
Channel count : This refers to the number of audio sources within an audio signal (the most common channel count, stereo sound, uses two channels, while mono sound uses one).Bitrate : The audio file’s rate of data transfer, typically represented by kilobits per second (kbps) or megabits per second (mbps).The standard bit depth of CD-quality audio is 16, while most hi-res audio files are 24 bit.
Bit depth : Audio bit depth measures the number of bits of data within each sample. 192 kHz, a sampling rate sometimes seen in hi-res audio, equals 192,000 samples per second (the most common sample rate is 48 kHz). This refers to the number of samples of the audio signal taken per second when converting that signal from analog to digital, typically expressed as samples per second in Hertz. Sample/sampling rate : Here’s where things get somewhat technical. File duration/length : The length of the audio file in hours, minutes, seconds and (if necessary) milliseconds. It’s also something to consider when you need to transfer those audio files to collaborators, clients, or partners, thanks to the file size limitations of most email platforms and cloud storage providers. Downloading hi-res tracks (which can weigh more than 100MB per song) or audiobooks (which are often 10-plus hours long) to storage can be equally resource-intensive. However, from a logistical perspective, streaming hi-res audio is notoriously bandwidth-needy and requires a strong internet connection. That’s great news for audiophiles, who now have a range of hi-res audio streaming options from Tidal, Amazon, and Spotify Premium, along with digital rights management (DRM)-free download options such as HDtracks and ProStudio Masters. Hi-res audio offers better sound quality than the common audio formats with lossy compression and relatively low bitrates. But audio files-especially in the age of audiobooks and high-resolution audio-are steadily getting bigger. When we think of sending large files, we often think of video content or even large datasets weighing hundreds of GBs.
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