What underlay would you recommend underneath engineered wood in a room that has an upright piano in it? The sub floor is concrete.
use a good quality acoustic underlay, the more you pay the better the properties... as per Trimmz post Excel is hard to better...
Excell or timbertech. Both great underlays. But your sub-floor needs to be even to take the weight of a piano. Sticking though is for sure the very best idea.