Linn is a British company that produces high-end audio equipment. They've been around for over five decades and started off just producing turntables. Since then, as turntables and record players fell out of fashion, they've switched their focus to producing Linn audio equipment that allows you to digital stream music over the home network.
Their products range from speakers and amps to full home music systems. These music systems are linked up to your home automation so you can play music in any room in your house at the touch of a button, from any device.
They also market their products as offering HiFi audio and claim that they're space optimized so that sound is delivered at the same quality it was in the recording studio. I bought and installed the Linn Majik DSM recently (listed here: https://www.rococosystems.com/product/linn-majik-dsm
) and I can attest to these claims - the sound quality is unbelievable