thanks a lot James for prompt answer i went right away to purchase many studio masters from a small but great french company QOBUZ which enables purchasing but also streaming of FLAC files even with iPhone !!   Back from my office I connected my X3 to my car stereo and YOOOOO what  a sound...

hello i just got my X3 and i already updated it to the new software back home i will try to transfer music from my imac should i format the external  64 gb micro sd card to NFTS for compatibility with MAC or keep it in FAT 32 ?   thanks for any comments