Elduende14, I can't comment on the Aleph J because I never have heard it, but do run a pair of XA-100's in my system. They are my new reference and offer great beauty sonicly in my system. For exact details concerning their sonic signature, take a look at my review posted here on the GON.
All the XA amps offer the same sonics, the only difference is their power output, so my experience with the XA-100's would apply to the 30's and 60's. Hope this helps.
All the XA amps offer the same sonics, the only difference is their power output, so my experience with the XA-100's would apply to the 30's and 60's. Hope this helps.