The Sonos ZP 90, also known as Sonos Connect, is a device designed to integrate traditional audio equipment with modern streaming capabilities. It features both audio inputs and outputs to enhance versatility in connecting various devices. Users can connect external audio sources such as turntables or CD players via its analog RCA inputs. For audio output, the ZP 90 provides multiple options, including RCA outputs, digital coaxial, and TOSLINK optical outputs, allowing seamless connection to amplifiers or receivers. The device can be controlled using the Sonos app on iOS or Android, which facilitates setting adjustments and offers a user-friendly experience. The Connect also offers adjustable line-out levels, where users can select between fixed and variable output. The fixed option allows for volume control solely through the amplifier, while the variable setting enables control via the Sonos app. This adaptability makes the ZP 90 suitable for various listening environments, enhancing setup flexibility.