6000's will be too big for the room, IMO in terms of height and maybe bass. The heads are very high and you really have to sit quite far'ish away to "get it all" compared to 5k's or smaller Meridians.

You can get a 24/96 ADC for your vinyl and use it into the speakers if you don't want to get a Meridian processor to do the ADC, as the speakers have 2 digital inputs - one for the Transporter and one for the ADC from your TT.

Roon/Tidal, SBT, Trinnov ST2 , Twin Devialet D premiers, Vivid Audio Giya G1 Spirits, dedicated and treated room.
Meridian gear: 568.2mm and DSP5000's acting as TV speakers.