I read on a review (semi-professional) that the quality of sound on different analog inputs on the 1804 are different. The reviewer said that the coaxial and multichannel inputs are of higher quality than the other source inputs. How can that be? Is the reviewer full of it? What about phono inputs? I understand that phono inputs are amplified somewhat differently but I don't know how or why. Is the CD input the same as Tape IN or Video 1?