I don't believe Sony publishes that kind of information, but it is good enough to support HiRes audio, however, if you demand better, you can use Sony's outboard PHA-1 or the PHA3 if you're real serious audiophile. Having had every Sony flagship since 2013, I've found the onboard barely adequate, and do hear a meaningful difference on the PHA-1 to justify the added cost and bulk, with a signigicant fidelity improvement as well as volume. I didn't feel that the PHA-3 was worth the price tag, as it did improve, but did not gain significant performance given the price-performance differential, and or reaching the limitations of my earpiece, using Audiofly AF160 and AF180 to audition. I feel the PHA-1 is best bang for the buck, but the added bulk is troubling. I find I only carry it on long trips where I expect long periods on a flight or car ride.
