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In the Forum: Playback Listening
In the Thread: 2+3 surround sound??
Post Subject: AuroPosted by Bill on: 4/19/2025
I've been into high end audio since 1965 and into ambiance recovery since the 1980's using a Hafler recovery system. Then on to four track tapes and the original Dolby system. Aall helped to recover the hall ambiance missing in two channel but all didn't quite give that concert hall feel. Then came Auro and the Hall effect was complete for me.
Rowuk is correct on all counts. The dsp Yamaha and Sony units take the main channels signals and add the acoustical signature from various concert halls. The problem I had with it is that overlays the acoustic signature of the original recording's acoustic onto the dsp signal, which can also be muddled by the multimiking of most recordings.
Auro 3d functions in several ways to give the ambiance depending on how the original program is recorded:
1. Best is if the recording was done in auro multichannel up to 13 channels plus subwoofer which is bit perfect either in pcm or dsd.
2. Second is the ability to redirect Dolby or dts to auro. This has the problem that Dolby or dts used lossy bits. But the auro recreates the soundstage far better.
3. Third is the ability to extract the ambiance information from 2 chaannel recordings. This can be very close to the hall ambiance if the original signal is derived from stereo microphones and decreases in effectiveness as the number of microphones increases.
The one problem Romy noticed on my system with this method is that the ambiance information is removed from the main channels and placed in the surrounds. This makes the front left and right channels sound less involving to those used to listening only to stereo. But listening in stereo only allows the soundstage only to envelope up to the level of the front of the main speakers but fills tha area from the speaker fronts to several feet behind the wall behind the speakers. Using auro with the ambiance channels can recreate the concert hall feel of the sound enveloping one from way behind the main speakers to many feet behind the wall behind me, to a ceiling height above my room's.
This could be overcome by running the front channels in stereo direct from the source, with the signal being sent through an auro device to obtain the ambiance channels. Romy has done this on his system by running two signals from his source; one direct to his front speakers, and the second to his auro or reverb processor. I cannot as I also use my trinnov altitude prepro to act as a four way active crossover for the main channels.
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