Here are some "facts" to refute James Lipiski
http://www.nadelectronics.com/reviews/C352-0404_framset.htm
" Of the changes made the most important are improvements to the DC servo circuit, which succeed in tightening up the bass response. We criticized the C352CTs predecessor for its ponderous presentation and clumsy low frequencies, but there are no such complaints following these improvements. With the original C352, NAD confesses the complementary transistors that provide the push and pull for the bass drivers werent working satisfactorily. The introduction of a high speed servo circuit seems to have solved this problem. "
Other changes also detailed @ the URL
http://www.nadelectronics.com/reviews/C352-0404_framset.htm
" Of the changes made the most important are improvements to the DC servo circuit, which succeed in tightening up the bass response. We criticized the C352CTs predecessor for its ponderous presentation and clumsy low frequencies, but there are no such complaints following these improvements. With the original C352, NAD confesses the complementary transistors that provide the push and pull for the bass drivers werent working satisfactorily. The introduction of a high speed servo circuit seems to have solved this problem. "
Other changes also detailed @ the URL