All the sounds ship as wave files (.wav) with a resolution of minimum 24bits/48KHz up to 24Bits/192KHz (except for some free sound packs). The exact resolution is written in the specs of each library.
As for the channels: depending on the product and its options, we deliver mono/stereo/quad(4.0)/surround(5.1)/ambisonics. The details are visible on each product page.