Hello Bill,
Definitely glue down. Floating would create an "isolation platform" between your speakers' cabinets and the slab which will possibily induce unwanted resonances back into the cabinets. Additionally, the floor will not allow your speakers' feet or spikes to couple into the floor/slab mechanism for positive dynamics coupling into the room. A floating or a sprung floor is also never good for a turntable.
I hope this helps.
Regards,
Dan
Definitely glue down. Floating would create an "isolation platform" between your speakers' cabinets and the slab which will possibily induce unwanted resonances back into the cabinets. Additionally, the floor will not allow your speakers' feet or spikes to couple into the floor/slab mechanism for positive dynamics coupling into the room. A floating or a sprung floor is also never good for a turntable.
I hope this helps.
Regards,
Dan