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My library is currently filled wiht all 320kbps mp3s, but i find its taking a bit too much space on my nexus 5 (android) 16gb, with music player "google play music," so im wondering if converting it all to 256 AAC would lower the quality. I listen to things with a sennheiser hd 598. It would save about 1gb if converted, so that really helps. Also, i wonder if listening to 256AACs on my mac (itunes) would have a lesser quality on my 598s.