Actually, you will need a special pre-amp called a Phono pre-amp. To increase recording time and reduce hiss, phonograph records are recorded with what is called RIAA Equalization. This produces a lower level signal with the low frequencies reduced and the high frequencies boosted. In order to reverse these conditions, a phono pre-amp stage is needed to convert them to standard line level signals with proper equalization. Older receivers/amplifiers often had a Phono plug built-in, but since the decline in popularity of records, nowadays they are scarce. So a separate device containing a phono pre-amp is needed to convert a phono level signal to the line-level used by Sonos. Some turntables have this phono pre-amp built-in, but that Technics does not.
They aren't expensive, you can pick on up at Amazon for around $10-20.