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http://support.apple.com/kb/sp620

 

http://www.stereophile.com/content/bk-st-140-power-amplifier-specifications

 

http://www.conradjohnson.com/It_just_sounds_right/pvclassic.html

 

i have a macbook 2011 with a power amp and a preamp. can i use these to listen to macbook music with headphones being amped up? what cables would i need? do i need both the preamp and power amp?