Sport X10 sound quality with and without ANC

Has ayone else noticed that the sound quality on the X10 is completely different with ANC on or off? If I turn ANC off, the bass completely dissapears. I really don’t need noise cancelling, so I’d rather have the longer battery life, but the sound quality without its is just plain bad. I’m on the latest firmware and I’ve even tried resetting the buds to no avail.