JT_2eighty
Hall of Fame
39 is pretty low!
It definitely is.
I can get away with it because my racquet is very dense, and very low powered.
Thus, low tensions in the 30s are actually very controllable, with stiff polys like Tour Bite, Luxilon BBO & ALU, etc.
If i use a softer poly like Polystar Turbo or Volkl Cyclone Tour, I still have to string in the 50-55 range, as 39-45 is way too powerful.
If I was using an APD or PDR, then 39 would not be doable (and I have used those racquets as well). I'm guessing you may have good results in the high 40s. But hey, we're all different.