From 
Almost a Hamlet question. Surely you also know the situation: the sound of z TCVR-a je akoby plechový a nejde Vám do uší…. Riešenie samozrejme existuje – externý reproduktor alebo slúchadlá. Čo je ale lepšie?
An external speaker is advantageous in that it does not burden the operator as much as headphones. However, it does not provide insulation from the external acoustic environment.
However, headphones can significantly suppress the disturbing influence of the environment. Whether you use open or closed ("excavator" type) or perhaps "plump", they have one disadvantage - they press on the ears and can even cause pressure sores when using the completely inappropriate type...
Therefore, our next survey is also focused on this problem. Let's be surprised how it looks between the operators...