I imagine the xa-30.5 is a more dynamic with wider soundstage and better grip on bass. I would like to trade my aleph 3 for one but my budget will not allow it right now. I wonder how it would compare to a first watt aleph j? one thing tho I would have to agree with Pubul57 about low power amp sounds better. I listened to a friends aleph 1.2, it sounded nice & sweet but didn't seem to sound as sweet as my aleph 3. maybe it has to do with more transistor in the signal path or something, it did not sound as pure as the low powered aleph. I also listen to a pair of bk mono blocks that were 200 wpc and, if did not sound a good as my aleph 3, or the aleph 1.2. I have been wanting to listen to aleph j but don't know any near me to compare and when I read the review on 6 moons on the xa-30.5, I have been drooling over the xa-30.5