I did read the article, but it doesn't clear my doubt. The doubt is over these 'B' terminals... Also if you check out the NAD website, they seem to have a 4 channel power amplifier in their hi-fi section and the denon (uk) website features the PMA1510 and PMA2010 whose extra speaker terminals supposedly cater for bi-amping as printed on the back panel.

NAD: http://nadelectronics.com/products/hifi-amplifiers/C-245BEE-Four-Channel-Amplifier#heading-downloads

Denon: http://www.denon.co.uk/Assets/images/products/PMA-1510AE
/EL_PMA1510AESP_E2_fr_000_back.jpg

Clovis de Cruz