I tried them with and without the inner foam donut.
Taking the inner foam out might bring back a little air…It's hard to tell. It sounds like it's not much necessarily making the highs brighter but is instead just making the nearby sounds around it a littler lighter with less body so it's easier to hear the air that's there.
It seems like there is slightly more body with the inner foam in.
Someone else can try it and see what they think.
I also tried with and without the outer grill caps. I didn't notice much change, but I didn't compare for long.
Originally Posted by chicolom 
My first listening said they were the same, apart from the pads, but I will swap pads again and give them another pass on the next session to double check.
I gave them several more A-B passes with swapped pads, and they still sound the same when using the same pads.
Edited by chicolom - 2/28/13 at 12:55am