I have both a EAD powermaster 2000 and a Pass labs X5. They are very different amps, The EAD is very smooth and the Pass is very detailed and very good on vocals. The X5 is very powerful given its 125x5 rating. The Pass is top notch with vocals and in the bass department. I like the Pass because of the soundstage and the detail more then the EAD. The Pass has a tranferable waranty so that is also a plus. I have picked two very very good amps to compare.