I am currently working on a consumer audio project using the AD2428. My question relates to the large EMI filtering section on the A2B Bus I/O sections (in the picture below). Are these filters only necessary because they are running in a car system, presumably alongside many other electronic systems, not to mention power lines, all of which create high frequency electromagnetic noise? Or are these filters necessary regardless of the application for coupling/decoupling or consistency do the potential requirement of having 15 m between nodes? If these filters aren't necessary to have for a non-noisy environment, it would be nice to shed the weight because it would reduce board size, complexity, and cost.
A follow up question to this would then be, if these filters aren't just for the high noise automotive environment but are in fact necessary no matter the end application, is the filter section circled below (from the EVAL-AD2428WD1BZ schematic) tuned to an input of 8 V, which is the output of the LTC3121 without the jumper installed? Or would a DC input of ~5V work.
Any help would be greatly appreciated.