Well that would make it entirely silent to me 
I'm deaf over 1kHz
taking out everything below 1000Hz I no longer think is valid for making it sound like radio. I did a search for test tones on YouTube and even 440 Hz seems a fair pitch - not what I would call 'bass'. I think its probably true that voice radio transmissions lack bass, but I question drawing the line at 1000 Hz (or even 440Hz) once I heard the test signals.
