The general technique for a turbine engine is to keep a fair bit of power flowing and compensate by increasing the drag with spoliers,speed brakes etc. The theory being that when you need power to go around you dont want the lag in getting full power as you attempt to push the throttles through the front window.
mmmm, (apart from the 146 and the F100) I'm not sure that I've heard of speedbrakes being used on final approach to correct speed. They should either be down, or armed! I think the technique in larger aircraft, is to "fly" the aircraft onto the runway, as opposed to "holding off". I would imagine that in an aircraft such as the 737, approach power can be maintained until about 10-20ft RA, and then the throttles smoothly closed???