Atom comes default with dual gain, 1.0x and 4.5x. So, for sensitive IEMs, you get 1.0 gain in stock Atom. Which is probably fine for most users. Which, I guess, is why JDS doesn't publicize custom gain options. Nice of them to offer to customize for you.All my headphones are sensitive. I was going to buy a JDS Labs Objective2 and remove two resistors to turn its 2.5X/6.5X gain into 1X/2.5X. But the company informs me I can buy a 1X/2.5X Atom by asking for those gain settings in my shipping notes. Why on earth don't they mention this option on the Atom page?