Two sound cards in a week — could it be true? Believe it or not, yes. Just days after Asus introduced its Audiophile Xonar DS 7.1 7.1, the company has unveiled its Xonar HDAV1.3 Slim Sound Card. Described as the planet’s first HDMI 1.3 audio card with true Blu-ray audio playback designed to fit HTPCs of all sizes, the card can actually bitstream true Blu-ray audio from one’s PC — something that BD enthusiasts have been clamoring for. The card features Protected Audio Playback Systems (PAPS) and full Advanced