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.
"JD" - Call 585-645-1006 or email email@example.com for AVR selection and pricing discussion 8am - 8pm EST daily (incl Sat/Sun)
AV Science - Dealer for Denon, Marantz, Yamaha, Onkyo, Def Tech, Atl Tech, SVS, Oppo
Think you have a defective AVR? Owner's manual - Factory reset 4-5 times in a row.