thanks uncle jeff.shredder,steve n very informative, thanks for all info will use AA FOR PREAMP HOOKED UP TO SQUEEZEBOX TRANSPORTER , AND WILL STILL USE MY CD,S AS WELL , WILL LOOK FORWARD TO REALLY LISTENING TO DIFFERENCES, SINCE THERE IS NO MOVING PARTS IN SQEEZEBOX TRANSPORTER ,THERE SHOULD BE NO JITTER AND SOUND GOOD , HOPEFULLY I WILL GET LOTS OF SHIMMER ON TOP AND A GREAT SOUNSTAGE AS I HVE NOW ,THANKS GUYS YOUR INPUT IS GREAT