Selectable 2, 4, 6 or 8 output channels with 24 bit playback at up to 96 kHz sampling rate.Allows for pass-through of Dolby Digital and DTS multi-channel DVD sound to external A/V receivers or digital speaker systems Optical S/PDIF In/Out for playback of pure digital audio at resolutions of up to 24 Bits at 96kHz (out) sample rate playback and 16 Bits at 48kHz sample rate for recording (in).Up until recently (except in the case of nForce 2 based motherboards with SoundStorm audio) this meant that you were only able to get Dolby Digital support from DVD audio since no other audio sources (games, music, ETC.) featured Dolby Digital audio support. With the second generation of 5.1 soundcards we also saw more manufacturers begin including optical S/PDIF outputs which allow you to hook your 5.1+ home theater system with optical digital inputs up to your soundcard for surround sound from Dolby Digital sources. Then we saw the first 6.1 soundcards followed pretty quickly by 7.1. You won’t see support for a new feature until the manufacturers are certain that the new feature will actually be embraced by consumers. It wasn’t too long after that that we began seeing 5.1 surround soundcards followed slowly by a good selection of 5.1 capable speaker systems, but, this is always the case. Back around 2000 that all started to change with the advent of quadraphonic soundcards and 4.1 speaker systems beginning to hit the scene.

It used to be that all you had were a pair of desktop speakers and a 2 channel soundcard and you were happy. Todays PC audio is getting more and more sophisticated.

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