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In the Forum: Playback Listening
In the Thread: 2+3 surround sound??
Post Subject: Yamaha did it rightPosted by rowuk on: 4/18/2025
For the Yamaha dedicated DSP reverb amplifiers, they actually went into various concert halls, had a special 4 microphone geometry capable of determining direction and used an impulse tone (I believe a pistol shot) and measured where the reflections came from and how they faded. This is far different than other schemes that just delay the rear channel or schemes like the Dynaco/Hafler that uses out of phase content from the original signal to generate "space".
There was a white paper on the microphone setup used in 1985 when they measured/programmed into the DSP1 (the acclaimed Frankfurt Alte Oper was one of them and is Hall 1A in the settings). A brief google search was not enough to find it. Here is the users guide however where at least the halls are described.
https://de.yamaha.com/files/download/other_assets/3/313903/DSP-100.pdfRerurn to Romy the Cat's Site