Well, the BOSE worked before and after enhancing. I cannot say "it helped". On the other hand, solid Ground lines are good practice in audio devices. I can only guess that it helps to enhance the SNR, THD or some other parameters. We must remember, that the boards are designed in the early 70's. Solid audio design knowledge was not really widespread. Other devices of that time are really full of cables. From this point of view, the BOSE is beautiful. And can be enhanced, in contrast to other old devices.