Hello! I am still looking for a TTR and wanted to pay attention to Bose when buying second-hand. My friend said that Bose in the TTR did not come to its full effect because the resonance was missing. Have the search for sound alternatives turned upside down…unfortunately found nothing How do Euro alternatives look sound-like and what did the conversion cost? Can Bose be safely dispensed with and even something much better installed for 500 to 1000 euros? the topic has already given, then please give me link to it. I really did not find anything. Thanks for the answers!