Hey Sergeik,
I have owned the X-350.5, XA-100's and now use XA-60.5's in my system. For the details on each amps performance take a look at my reviews here on the GON on allof them. Their is no doubt that the XA.5 series amps are Nelson Pass's best generation yet of his designs. Have not heard his new much more expensive four box monoblocks yet, but I'm sure their something special.
I have owned the X-350.5, XA-100's and now use XA-60.5's in my system. For the details on each amps performance take a look at my reviews here on the GON on allof them. Their is no doubt that the XA.5 series amps are Nelson Pass's best generation yet of his designs. Have not heard his new much more expensive four box monoblocks yet, but I'm sure their something special.