aquila2010 Posted August 23, 2015 Report Share Posted August 23, 2015 Hello, as far as I know the 555 was designed by Nelson Pass, but I don't know who was the 555 II designer. Have you ever compared them driving the biggest AR speakers (3a, 10Pi, 11, 9, 91 etc.) at the same time? What are the sonic differences between 555 and 555 II? They say they were very different sonically. What about their reliability? They are old and their failure could seriously damage our beloved speakers. Thank you Link to comment Share on other sites More sharing options...
This topic is now archived and is closed to further replies.