The WPC figure is only rated for 2ch. For 4ch it'll be lower.
In any case it's been said n times it's pointless to do it. Read this.
Audiosceptics accept audio trials using 25 people. A recent Oxford study with over 353,000 patient records from 639 separate clinical trials shows for every 1,000 people taking diclofenac or ibuprofen there would be 3 additional heart attacks, 4 more cases of heart failure and 1 death every year.
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