Great, Thanks guys for the info. I was going to fust get a dedicated headphone amp but I think the preamp is the way to go, again, many thanks....

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Outlaw 950/750,Oppo 203/970 ,Definitive tech bp 7006,Definitive tech clr2500,infinity rs225 surrounds,Outlaw LFM-1 ,
Panamax 5100.