It's 2x chances

Yep, just what Riptide just have said. The drop frenzy event increases chances of getting a Speed set Artifacts. It doesn't imply that whenever you get such an Artifact, you should also get an additional piece of the same set

2X chances of getting speed set, but seems 2X of chances not getting Speed set for me.

2 x 0 = 0

i seem to have bad luck during the 2x events as well, but that's just rng.  i'm sure others are rolling in the gear.

i did very poorly during the 2x stun event, but then the next FK event i seemed to get stun every other run.  somedays luck is on your side.

50 runs i get 2 speed items 

2x is broken 

i got more life steal and poison item 

This  is  my  30  runs  for  Day  1

i

5  Speed  Pieces  out  of  30  Items.

I  only  saved  1   Speed piece  out  of  the  5.

I  don't  know  how  many  Speed  gears  are  suppose  to  drop  out  of  30  runs.

Maybe,  the  2x  Speed  Drop  Chance  is  working.

Maybe,  the  2x  Speed  Drop  Chance  is  broken.

Im up to 3k energy spent, its running at about 15% drop rate for me, but as i have no idea what the normal drop rate is supposed to be i dont know if it is working.

None of the pieces have been a speed upgrade, but when you think of the levels of rng

1) Needs to be speed gear

2) Needs to be the right slot.

3) Needs to have a speed stat

4) You need to roll on that speed stat 3/4 times

The odds of getting a new triple roll speed piece are less than 1/1000 most likely.

it means uve got a 50x chance to get frost set. :) 

yup...same here...just 1 speed set out of 30 runs roughly....i did 3 sets of 30 runs...2x only 1 speed set and 1 time 2 speed sets...typically they all render useless once i start upgrading them because that's just a matter of luck right?. how the hell can you ever collect enough gear to get some decently geared arenachamps?...oohhh of course!!...just spend gazillions of real hard cash...you nearly got me plarium!!