Try these sites for explanation.
http://www.hans-egebo.dk/Tutorial/biasing.htm
http://www.upscaleaudio.com/primaluna/autobiaswhitepaper.htm
Although I believe the Shanlings are self biasing, you can adjust the bias (You may have to shave off the collar surrounding the cable exit at the bottom due to the decorative plates on top of the Amp to make good contact) with this tool.
http://biasking.com/
http://www.hans-egebo.dk/Tutorial/biasing.htm
http://www.upscaleaudio.com/primaluna/autobiaswhitepaper.htm
Although I believe the Shanlings are self biasing, you can adjust the bias (You may have to shave off the collar surrounding the cable exit at the bottom due to the decorative plates on top of the Amp to make good contact) with this tool.
http://biasking.com/