I live in Sweden and have the same problem, my E507 is great but the maximum sound level is way too low here in Europe. (My hearing is just fine, thank you). I’m curious, though, if we really have lower max output in Europe. Are you guys who have purchased the E507 outside of Europe satisfied with the maximum sound pressure? The way to enter test mode is to press play at the same time as the reset button, according to service manual ver. 1.2 for the NW-50X series. The manual also includes additional info about test mode. But, as far as I can tell, there is no way to adjust the sound level through test mode. I'd love to be proven wrong however and any help with how to increase maximum volume would be greatly appreciated. Thanks for a great site btw!