Skullcandy, which is moving into lightweight wireless earbuds and headphones, saw its sales increase by 8 percent to $57.9 million in the second quarter. They rose by 5 percent to $41.3 million in the U.S. and by 16 percent to $16.7 million in other markets, with growth of 24 percent in local currencies. The gross margin declined by 2.2 percentage points to 42.8 percent, and it was off by 6.6 percentage points to 40 percent internationally because of foreign currencies. Net earnings fell by 23 percent to $1,215,000, but they would have risen by 19 percent if the dollar had stayed the same.