Re: IS SACD and DVD-A REALLY HI-FI?
Technically, Yes. Practically, depends.
Technically, both SACD and DVD-A use higher sampling rates and better bit-depths. That means, a much more realistic representation of the actual recording.
Pratically, stereo was born to give a better sense of sound field (against mono), because it was thought human brain perceives the sound field by the difference in sound reaching at both the ears. Stereo achieved that to a great extent. Multi-channel audio tries to enhance that experience. In a true implementation, a DVD-A will reproduce the recorded sound field with a much greater degree of precision than stereo. As in, placement of instruments and vocalists would be much more localizable than in stereo.
But, a big but, is the implementation. Is multichannel audio being produced "honestly"? IMO, the answer is - No. What we see is a remastering of old recordings in multichannel. Hello, aren't we doing something wrong here? Aren't we doing what the DPL or DPL II circuits onboard a multichannel integrated amp already does? Yes, we are. The only difference being, when they do that in a studio, they achieve better results. Why? Because supposedly they remaster. As in, they read from the 'original' tapes again, mix it into multichannel format (mosltly with more sophisticated equipments than can be found in home setups.) So I do not see that as a "true" multichannel audio.
Let us face it, there are challenges in recording audio. More in mixing it correctly. Recording is not the problem (you can place as many microphones as required), but mixing is. The process of mixing the Audio is where things can make or break. But if at all, we could have true implementation of multichannel audio, I bet my life, it would sound far more engaging that 2 channels.
That was just the recording and mixing angle. Looking at the reproduction part. We spend about a grand on each equipment, in a stereo system. So if we spend £4000 on a 2 channel system, i.e. £2000 per channel, do we spend £12000 on a 5.1 channel system? Or £14000 on a 7.1 channel system. Believe me, if we did, and if we have an SACD or a DVD-A recorded truely in multiple channels and mixed properly, that would beat its stereo equivalent by a huge margin.
My conclusion is: multichannel audio is dying because of improper implementation and usage, and not because the technology itself is flawed.