First a couple of basic questions / observations 1) are all wireless headphones digital now or is analogue still available? 2) some years ago I bought Ampliphone digital and although the sound quality was good, the build quality was not and they did not last long.   So now please can anyone...

First a couple of basic questions / observations 1) are all wireless headphones digital now or is analogue still available? 2) some years ago I bought Ampliphone digital and although the sound quality was good, the build quality was not and they did not last long.   So now please can anyone...

I just bought my first wireless headphones (AKG 305) and was unhappy about the background noise. My dealer changed them for the K405 and these a just as bad., I have never had UHF headphones before - is it usual to expect a constant backgroung hiss?