Have to agree with @dfarmer - the lingo 4 is a massive and impressive improvement over my prior lingo 1.
And as @daveyf said- the 4 is in a very slim box. Google it and you’ll see it looks unlike anything else Linn. Linn “split” the lingo by housing part of the circuitry on a board that fits within the turntable (think valhalla) and the rest of the circuitry in an external box. There are 2 other ways the lingo 4 is a significant departure from earlier lingos- the 4 uses a 12v motor while previously a 120v motor was used and the 4 does use a tach for servo control as does the Radikal (but in a way different from the typical direct drive scheme). Since it is a synchronous motor its speed is locked in both by line frequency which is tightly regulated and the tach. It’s a built in redundancy.