Should an AC line conditioner be placed before or after the power cord to the amp?

At the advice of my brother I purchased a Furman AC line conditioner (Elite-15PFi) to not only clean up the power coming from my receptacle but also to protect my gear from power surges.  The difference it has made to my system is amazing (in a good way that is).  I decided to replace the stock power cord with an Audience PowerChord.  I was planning to keep the Furman installed into the receptacle and then run the Audience PowerChord from the Furman to the amplifier thereby.  He however claims that the PowerChord should be plugged into the receptacle and the Furman and then plug the amp into the Furman using the stock cord.  Who is correct?  I was thinking that the Furman would clean up the incoming power and that the PowerChord would preserve that "cleaner power" going to the amp.  This would also protect the new PowerChord.  If I install it as he suggests using a stock power cord am I not defeating the purpose behind buying a better power cord to begin with?  Thanks in advance to all who respond.