bo1972"The AudioFacts Pro modification brings the D1/D2 to a superior level compared to the A1 and also T2."
Caution that such alteration, adjustment, and modification will void warrantee and may in fact render the component functionally and practically unrepaireable, unserviceable, and inoperative the manufacturer will tell you to "take a hike" if you you seek service or repair of such a modified unit.
The other problem is that these alterations are made without accounting for ICSS distortion which is something bo1972 has yet to fully comprehend because he thinks he has already isolated, identified, and accounted for all of the properties of the equipment he sells.