Which digital connections are used for audio transfers?

The selection of SPIDIF and AES/EBU as the answer is correct due to their roles as professional digital audio interfaces designed for high-quality audio signal transfer. SPIDIF (Sony/Philips Digital Interface) is widely used for transmitting stereo digital audio signals over short distances, typically utilizing coaxial or optical cables. This makes it suitable for connecting devices like CD players, digital mixers, and audio interfaces in both consumer and professional environments.

AES/EBU (Audio Engineering Society/European Broadcasting Union) is another standard for professional digital audio interconnections. It allows for the transfer of multi-channel digital audio signals over balanced XLR cables, supporting higher audio quality and longer cable runs compared to SPIDIF. This protocol is commonly found in studio settings and is integral for maintaining audio integrity in professional audio environments.

The other choices refer to various audio transfer methods, but they may not all align with digital audio specifications in the same way. USB and FireWire are primarily used for device connections and data transfer, typically encompassing both audio and other data types, while HDMI and Optical can transmit audio but are often associated with video content. RCA and XLR generally pertain to analog connections, where RCA is a standard for unbalanced audio connections and XLR