I'm using a 6.5 x 14 Ludwig Supraphonic on my kit, and lately it's been feeling a bit flat. I can't get it to resonate the way I want it to. I can get a good 'crack' out of it. However, I don't get any of those whirling high's that I love.
After experimenting with tuning the batter snare drum head WAY up, I had almost given up. I blamed it on old heads. However, it turns out that all I needed to do was tune the resonant head higher. It was like magic!